Iron-based amorphous alloy suitable for additive manufacturing

Abstract

The application discloses an iron-based amorphous alloy suitable for additive manufacturing, and ingredients of the iron-based amorphous alloy are as follows in percentage by mass: Cr: 20-22.5%; Mo: 15.2-16.1%; B: 1.9-2.8%; Si: 1.70-1.95%; C: 2.4-2.8%; Nb: 3.40-3.75%; V: 1.56-2.20%; Dy: 2.20-2.40%; Y: 0.50-0.69%, and the balance is Fe. When the alloy system is used for additive manufacturing, the printing process is good, the mechanical properties are excellent, the prepared sample has an amorphous volume ratio of more than 85%, and the highest microhardness can reach 1260HV.

Description

Technical Field

[0001] This invention relates to the field of additive manufacturing technology, and more specifically to an iron-based amorphous alloy suitable for use in additive manufacturing. Background Technology

[0002] Additive manufacturing involves building up thin layers of material to create three-dimensional solid parts based on a computer-aided design (CAD) model. Compared to traditional equal-material manufacturing and subtractive manufacturing, additive manufacturing significantly shortens the production cycle of parts, has high material utilization, and is more efficient and flexible in design optimization. It is widely used in the design and manufacturing of high-performance parts in aerospace, energy, medical, and automotive fields, and these advantages have been demonstrated in production processes across various industries and different stages of product development cycles.

[0003] Ferro-based amorphous alloys have attracted much attention due to their excellent corrosion and wear resistance, ultra-high strength and hardness, and relatively low material cost. However, their application as structural materials is limited by their amorphous forming ability and machinability. Furthermore, the high hardness and brittleness of ferro-based amorphous alloys make them difficult to machine. Applying additive manufacturing technology to the forming of complex-shaped ferro-based amorphous alloy parts holds promise for solving these application challenges.

[0004] Existing iron-based amorphous alloy systems experience high stress during additive manufacturing, making them prone to defects such as cracks and porosity. Their poor formability and processability also hinder their application, limiting their suitability for additive manufacturing. Therefore, there is a need to develop novel iron-based amorphous alloy materials suitable for additive manufacturing. Summary of the Invention

[0005] To address the issues of limited variety, poor formability, and poor processability of iron-based amorphous alloys suitable for additive manufacturing, this invention aims to provide an iron-based amorphous alloy suitable for additive manufacturing and its preparation method.

[0006] The technical solution to achieve the purpose of this invention is:

[0007] A type of iron-based amorphous alloy suitable for additive manufacturing has the following chemical composition by mass percentage: Cr: 20–22.5%; Mo: 15.2–16.1%; B: 1.9–2.8%; Si: 1.70–1.95%; C: 2.4–2.8%; Nb: 3.40–3.75%; V: 1.56–2.20%; Dy: 2.20–2.40%; Y: 0.50–0.69%, with the balance being Fe.

[0008] The method for additive manufacturing of iron-based amorphous alloys based on iron-based amorphous alloy powder specifically includes the following steps:

[0009] According to the designed composition ratio, iron-based amorphous alloy powder with a particle size of 15-53 μm was prepared by melting, atomizing and sieving. The iron-based amorphous alloy powder was used to prepare a bulk material by selective laser melting. A laser with a spot diameter of 90 μm was selected, and a scanning strategy of rotating the laser scanning direction by 90° for each layer was adopted. The laser power was set to 150W-250W, the scanning speed was 800-1000 mm / s, the scanning interval was 70 μm, and the powder layer thickness was 30 μm. The bulk sample of the iron-based amorphous alloy was additively manufactured on the substrate.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0011] This invention designs an iron-based amorphous alloy suitable for additive manufacturing. This alloy system exhibits good printability and excellent mechanical properties when used in additive manufacturing, with a microhardness reaching up to 1260 HV. The bulk additive body obtained through additive manufacturing achieves a Vickers hardness of 1100–1260 HV parallel to the substrate direction and 1000–1200 HV perpendicular to the substrate direction. In summary, the samples manufactured using the iron-based amorphous alloy exhibit good printability and formability, excellent bulk properties, high strength, and superior high-temperature performance. Detailed Implementation

[0012] This invention provides an iron-based amorphous alloy suitable for additive manufacturing. This iron-based amorphous alloy contains elements such as Fe, Cr, Mo, B, and C. The resulting additive manufacturing process exhibits good processability and formability, excellent bulk properties, high strength, and superior high-temperature performance.

[0013] The iron-based amorphous alloy suitable for additive manufacturing described in this invention has the following chemical composition by mass percentage: Cr: 20-22.5%; Mo: 15.2-16.1%; B: 1.9-2.8%; Si: 1.70-1.95%; C: 2.4-2.8%; Nb: 3.40-3.75%; V: 1.56-2.20%; Dy: 2.20-2.40%; Y: 0.50-0.69%, with the balance being Fe. Specifically, it includes the following steps:

[0014] According to the above proportions, the materials are successively smelted, atomized, and sieved to obtain iron-based amorphous alloy powder with a diameter of 15-53 μm. The powder is then used to prepare iron-based amorphous alloy bulk material using selective laser melting technology. A laser with a spot diameter of 90 μm is selected, and a scanning strategy of rotating the laser scanning direction by 90° for each layer is adopted. The laser power is set to 150W-250W, the scanning speed is 800-1000 mm / s, the scanning interval is 70 μm, and the powder layer thickness is 30 μm. The bulk sample of the iron-based amorphous alloy is then additively manufactured on the substrate.

[0015] Example 1

[0016] A type of iron-based amorphous alloy powder suitable for additive manufacturing has the following chemical composition by mass percentage: Cr: 20.1%, Mo: 15.4%, B: 2.39%, Si: 1.76%, C: 2.43%, Nb: 3.62%, V: 1.78%, Dy: 2.31%, Y: 0.53%, with the balance being Fe.

[0017] According to the above-mentioned proportions, the materials were sequentially smelted, atomized, and sieved to obtain iron-based amorphous alloy powder with a diameter of 15–53 μm. This powder was then used to prepare iron-based amorphous alloy bulk materials using selective laser melting. A laser with a spot diameter of 90 μm was selected, employing a scanning strategy of rotating the laser scanning direction by 90° per layer. The laser power was set to 200 W, the scanning speed to 900 mm / s, the scanning interval to 70 μm, and the powder layer thickness to 30 μm. This additive manufacturing process yielded bulk samples with dimensions of 10 × 10 × 2 mm. The prepared samples were then cut into two types: those parallel to the substrate and those perpendicular to the substrate.

[0018] Metallographic specimens were prepared and observed. The specimens showed no obvious defects such as pores, lack of fusion, or cracks, and the amorphous content was over 85%.

[0019] The Vickers hardness measured parallel to the substrate direction was 1220 HV, and the Vickers hardness measured perpendicular to the substrate direction was 1150 HV.

[0020] Example 2

[0021] A type of iron-based amorphous alloy suitable for additive manufacturing has the following chemical composition by mass percentage: Cr: 21.2%, Mo: 15.3%, B: 2.40%, Si: 1.77%, C: 2.46%, Nb: 3.63%, V: 1.82%, Dy: 2.32%, Y: 0.55%, with the balance being Fe.

[0022] The alloy composition was prepared into iron-based amorphous alloy powder with a thickness of 15–53 μm. Iron-based amorphous alloy bulk materials were then prepared using selective laser melting (SLM). A laser with a spot diameter of 90 μm was selected, employing a scanning strategy of rotating the laser scanning direction by 90° per layer. The laser power was set to 200 W, the scanning speed to 900 mm / s, the scanning interval to 70 μm, and the powder layer thickness to 30 μm. The resulting additive manufacturing yielded bulk samples with dimensions of 10 × 10 × 2 mm. The prepared samples were then cut into two types: those parallel to the substrate and those perpendicular to the substrate.

[0023] Metallographic specimens were prepared and observed. The specimens showed no obvious defects such as pores, lack of fusion, or cracks, and the amorphous content was over 85%.

[0024] The Vickers hardness measured parallel to the substrate direction was 1230 HV, and the Vickers hardness measured perpendicular to the substrate direction was 1140 HV.

[0025] Example 3

[0026] A type of iron-based amorphous alloy suitable for additive manufacturing has the following chemical composition by mass percentage: Cr: 22.4%, Mo: 15.4%, B: 2.38%, Si: 1.78%, C: 2.44%, Nb: 3.61%, V: 1.84%, Dy: 2.31%, Y: 0.56%, with the balance being Fe.

[0027] The alloy composition was prepared into iron-based amorphous alloy powder with a thickness of 15–53 μm. Iron-based amorphous alloy bulk materials were then prepared using selective laser melting (SLM). A laser with a spot diameter of 90 μm was selected, employing a scanning strategy of rotating the laser scanning direction by 90° per layer. The laser power was set to 200 W, the scanning speed to 900 mm / s, the scanning interval to 70 μm, and the powder layer thickness to 30 μm. The resulting additive manufacturing yielded bulk samples with dimensions of 10 × 10 × 2 mm. The prepared samples were then cut into two types: those parallel to the substrate and those perpendicular to the substrate.

[0028] Metallographic specimens were prepared and observed. The specimens showed no obvious defects such as pores, lack of fusion, or cracks, and the amorphous content was over 85%.

[0029] The Vickers hardness measured parallel to the substrate direction was 1200 HV, and the Vickers hardness measured perpendicular to the substrate direction was 1160 HV.

[0030] Comparative Example 1

[0031] A type of iron-based amorphous alloy suitable for additive manufacturing has the following chemical composition by mass percentage: Mo: 15.4%, B: 2.40%, Si: 1.80%, C: 2.44%, Nb: 3.62%, V: 1.82%, Dy: 2.31%, Y: 0.55%, with the balance being Fe.

[0032] The alloy composition was made into iron-based amorphous alloy powder with a thickness of 15–53 μm. Iron-based amorphous alloy bulk material was prepared by selective laser melting. A laser with a spot diameter of 90 μm was selected. A scanning strategy of rotating the laser scanning direction by 90° for each layer was adopted. The laser power was set to 200 W, the scanning speed to 900 mm / s, the scanning interval to 70 μm, and the powder layer thickness to 30 μm. A bulk sample with a size of 10 × 10 × 2 mm was obtained by additive manufacturing.

[0033] Metallographic specimens were prepared and observed. A small number of pores and microcracks were found in the specimens.

[0034] Example 4

[0035] A type of iron-based amorphous alloy suitable for additive manufacturing has the following chemical composition by mass percentage: Cr: 21.4%, Mo: 15.2%, B: 2.36%, Si: 1.76%, C: 2.40%, Nb: 3.52%, V: 1.80%, Dy: 2.24%, Y: 0.57%, with the balance being Fe.

[0036] The alloy composition was prepared into iron-based amorphous alloy powder with a thickness of 15–53 μm. In bulk iron-based amorphous alloy was then prepared using selective laser melting (SLM). A laser with a spot diameter of 90 μm was selected, employing a scanning strategy of rotating the laser scanning direction by 90° per layer. The laser power was set to 250 W, the scanning speed to 1000 mm / s, the scanning interval to 70 μm, and the powder layer thickness to 30 μm. The resulting additive manufacturing yielded bulk samples with dimensions of 10 × 10 × 2 mm. The prepared samples were then cut into two types: those parallel to the substrate and those perpendicular to the substrate.

[0037] Metallographic specimens were prepared and observed. The specimens showed no obvious defects such as pores, lack of fusion, or cracks, and the amorphous content was over 85%.

[0038] The Vickers hardness measured parallel to the substrate direction was 1210 HV, and the Vickers hardness measured perpendicular to the substrate direction was 1150 HV.

[0039] Example 5

[0040] A type of iron-based amorphous alloy suitable for additive manufacturing has the following chemical composition by mass percentage: Cr: 21.4%, Mo: 15.8%, B: 2.35%, Si: 1.77%, C: 2.43%, Nb: 3.54%, V: 1.81%, Dy: 2.26%, Y: 0.62%, with the balance being Fe.

[0041] The alloy composition was prepared into iron-based amorphous alloy powder with a thickness of 15–53 μm. In bulk iron-based amorphous alloy was then prepared using selective laser melting (SLM). A laser with a spot diameter of 90 μm was selected, employing a scanning strategy of rotating the laser scanning direction by 90° per layer. The laser power was set to 250 W, the scanning speed to 1000 mm / s, the scanning interval to 70 μm, and the powder layer thickness to 30 μm. The resulting additive manufacturing yielded bulk samples with dimensions of 10 × 10 × 2 mm. The prepared samples were then cut into two types: those parallel to the substrate and those perpendicular to the substrate.

[0042] Metallographic specimens were prepared and observed. The specimens showed no obvious defects such as pores, lack of fusion, or cracks, and the amorphous content was over 85%.

[0043] The Vickers hardness measured parallel to the substrate direction was 1260 HV, and the Vickers hardness measured perpendicular to the substrate direction was 1130 HV.

[0044] Example 6

[0045] A type of iron-based amorphous alloy suitable for additive manufacturing has the following chemical composition by mass percentage: Cr: 21.4%, Mo: 16.1%, B: 2.36%, Si: 1.76%, C: 2.44%, Nb: 3.55%, V: 1.82%, Dy: 2.25%, Y: 0.59%, with the balance being Fe.

[0046] The alloy composition was prepared into iron-based amorphous alloy powder with a thickness of 15–53 μm. In bulk iron-based amorphous alloy was then prepared using selective laser melting (SLM). A laser with a spot diameter of 90 μm was selected, employing a scanning strategy of rotating the laser scanning direction by 90° per layer. The laser power was set to 250 W, the scanning speed to 1000 mm / s, the scanning interval to 70 μm, and the powder layer thickness to 30 μm. The resulting additive manufacturing yielded bulk samples with dimensions of 10 × 10 × 2 mm. The prepared samples were then cut into two types: those parallel to the substrate and those perpendicular to the substrate.

[0047] Metallographic specimens were prepared and observed. The specimens showed no obvious defects such as pores, lack of fusion, or cracks, and the amorphous content was over 85%.

[0048] The Vickers hardness measured parallel to the substrate direction was 1190 HV, and the Vickers hardness measured perpendicular to the substrate direction was 1090 HV.

[0049] Comparative Example 2

[0050] A type of iron-based amorphous alloy suitable for additive manufacturing has the following chemical composition by mass percentage: Cr: 21.4%, B: 2.36%, Si: 1.76%, C: 2.44%, Nb: 3.55%, V: 1.87%, Dy: 2.25%, Y: 0.59%, with the balance being Fe.

[0051] The alloy composition was made into iron-based amorphous alloy powder with a thickness of 15–53 μm. Iron-based amorphous alloy bulk material was prepared by selective laser melting. A laser with a spot diameter of 90 μm was selected. A scanning strategy of rotating the laser scanning direction by 90° for each layer was adopted. The laser power was set to 250 W, the scanning speed to 1000 mm / s, the scanning interval to 70 μm, and the powder layer thickness to 30 μm. A bulk sample with a size of 10 × 10 × 2 mm was obtained by additive manufacturing.

[0052] Metallographic specimens were prepared and observed. Numerous small pores and some fine microcracks were observed inside the specimens.

[0053] Example 7

[0054] A type of iron-based amorphous alloy suitable for additive manufacturing has the following chemical composition by mass percentage: Cr: 21.6%, Mo: 15.3%, B: 1.91%, Si: 1.75%, C: 2.46%, Nb: 3.56%, V: 1.79%, Dy: 2.23%, Y: 0.61%, with the balance being Fe.

[0055] The alloy composition was prepared into iron-based amorphous alloy powder with a thickness of 15–53 μm. Iron-based amorphous alloy bulk materials were then prepared using selective laser melting (SLM). A laser with a spot diameter of 90 μm was selected, employing a scanning strategy of rotating the laser scanning direction by 90° per layer. The laser power was set to 200 W, the scanning speed to 900 mm / s, the scanning interval to 70 μm, and the powder layer thickness to 30 μm. The resulting additive manufacturing yielded bulk samples with dimensions of 10 × 10 × 2 mm. The prepared samples were then cut into two types: those parallel to the substrate and those perpendicular to the substrate.

[0056] Metallographic specimens were prepared and observed. The specimens showed no obvious defects such as pores, lack of fusion, or cracks, and the amorphous content was over 85%.

[0057] The Vickers hardness measured parallel to the substrate direction was 1210 HV, and the Vickers hardness measured perpendicular to the substrate direction was 1170 HV.

[0058] Example 8

[0059] A type of iron-based amorphous alloy suitable for additive manufacturing has the following chemical composition by mass percentage: Cr: 21.6%, Mo: 15.3%, B: 2.43%, Si: 1.76%, C: 2.44%, Nb: 3.56%, V: 1.79%, Dy: 2.24%, Y: 0.62%, with the balance being Fe.

[0060] The alloy composition was prepared into iron-based amorphous alloy powder with a thickness of 15–53 μm. Iron-based amorphous alloy bulk materials were then prepared using selective laser melting (SLM). A laser with a spot diameter of 90 μm was selected, employing a scanning strategy of rotating the laser scanning direction by 90° per layer. The laser power was set to 200 W, the scanning speed to 900 mm / s, the scanning interval to 70 μm, and the powder layer thickness to 30 μm. The resulting additive manufacturing yielded bulk samples with dimensions of 10 × 10 × 2 mm. The prepared samples were then cut into two types: those parallel to the substrate and those perpendicular to the substrate.

[0061] Metallographic specimens were prepared and observed. The specimens showed no obvious defects such as pores, lack of fusion, or cracks, and the amorphous content was over 85%.

[0062] The Vickers hardness measured parallel to the substrate direction was 1220 HV, and the Vickers hardness measured perpendicular to the substrate direction was 1160 HV.

[0063] Example 9

[0064] A type of iron-based amorphous alloy suitable for additive manufacturing has the following chemical composition by mass percentage: Cr: 21.5%, Mo: 15.3%, B: 2.79%, Si: 1.76%, C: 2.43%, Nb: 3.59%, V: 1.80%, Dy: 2.26%, Y: 0.62%, with the balance being Fe.

[0065] The alloy composition was prepared into iron-based amorphous alloy powder with a thickness of 15–53 μm. Iron-based amorphous alloy bulk materials were then prepared using selective laser melting (SLM). A laser with a spot diameter of 90 μm was selected, employing a scanning strategy of rotating the laser scanning direction by 90° per layer. The laser power was set to 200 W, the scanning speed to 900 mm / s, the scanning interval to 70 μm, and the powder layer thickness to 30 μm. The resulting additive manufacturing yielded bulk samples with dimensions of 10 × 10 × 2 mm. The prepared samples were then cut into two types: those parallel to the substrate and those perpendicular to the substrate.

[0066] Metallographic specimens were prepared and observed. The specimens showed no obvious defects such as pores, lack of fusion, or cracks, and the amorphous content was over 85%.

[0067] The Vickers hardness measured parallel to the substrate direction was 1170 HV, and the Vickers hardness measured perpendicular to the substrate direction was 1060 HV.

[0068] Comparative Example 3

[0069] A type of iron-based amorphous alloy suitable for additive manufacturing has the following chemical composition by mass percentage: Cr: 21.5%, Mo: 15.3%, Si: 1.76%, C: 2.43%, Nb: 3.59%, V: 1.80%, Dy: 2.26%, Y: 0.62%, with the balance being Fe.

[0070] The alloy composition was made into iron-based amorphous alloy powder with a thickness of 15–53 μm. Iron-based amorphous alloy bulk material was prepared by selective laser melting. A laser with a spot diameter of 90 μm was selected. A scanning strategy of rotating the laser scanning direction by 90° for each layer was adopted. The laser power was set to 200 W, the scanning speed to 900 mm / s, the scanning interval to 70 μm, and the powder layer thickness to 30 μm. A bulk sample with a size of 10 × 10 × 2 mm was obtained by additive manufacturing.

[0071] Metallographic specimens were prepared and observed. No obvious pores were observed in the specimens, but there were obvious cracks.

[0072] Example 10

[0073] A type of iron-based amorphous alloy suitable for additive manufacturing has the following chemical composition by mass percentage: Cr: 21.5%, Mo: 15.4%, B: 2.40%, Si: 1.71%, C: 2.47%, Nb: 3.59%, V: 1.81%, Dy: 2.25%, Y: 0.59%, with the balance being Fe.

[0074] The alloy composition was prepared into iron-based amorphous alloy powder with a thickness of 15–53 μm. Iron-based amorphous alloy bulk materials were then prepared using selective laser melting (SLM). A laser with a spot diameter of 90 μm was selected, employing a scanning strategy of rotating the laser scanning direction by 90° per layer. The laser power was set to 150 W, the scanning speed to 800 mm / s, the scanning interval to 70 μm, and the powder layer thickness to 30 μm. The resulting additive manufacturing yielded bulk samples with dimensions of 10 × 10 × 2 mm. The prepared samples were then cut into two types: those parallel to the substrate and those perpendicular to the substrate.

[0075] Metallographic specimens were prepared and observed. The specimens showed no obvious defects such as pores, lack of fusion, or cracks, and the amorphous content was over 85%.

[0076] The Vickers hardness measured parallel to the substrate direction was 1260 HV, and the Vickers hardness measured perpendicular to the substrate direction was 1080 HV.

[0077] Example 11

[0078] A type of iron-based amorphous alloy suitable for additive manufacturing has the following chemical composition by mass percentage: Cr: 21.6%, Mo: 15.5%, B: 2.41%, Si: 1.83%, C: 2.46%, Nb: 3.62%, V: 1.79%, Dy: 2.28%, Y: 0.59%, with the balance being Fe.

[0079] The alloy composition was prepared into iron-based amorphous alloy powder with a thickness of 15–53 μm. Iron-based amorphous alloy bulk materials were then prepared using selective laser melting (SLM). A laser with a spot diameter of 90 μm was selected, employing a scanning strategy of rotating the laser scanning direction by 90° per layer. The laser power was set to 150 W, the scanning speed to 800 mm / s, the scanning interval to 70 μm, and the powder layer thickness to 30 μm. The resulting additive manufacturing yielded bulk samples with dimensions of 10 × 10 × 2 mm. The prepared samples were then cut into two types: those parallel to the substrate and those perpendicular to the substrate.

[0080] Metallographic specimens were prepared and observed. The specimens showed no obvious defects such as pores, lack of fusion, or cracks, and the amorphous content was over 85%.

[0081] The Vickers hardness measured parallel to the substrate direction was 1150 HV, and the Vickers hardness measured perpendicular to the substrate direction was 1030 HV.

[0082] Example 12

[0083] A type of iron-based amorphous alloy suitable for additive manufacturing has the following chemical composition by mass percentage: Cr: 21.6%, Mo: 15.4%, B: 2.41%, Si: 1.95%, C: 2.46%, Nb: 3.61%, V: 1.79%, Dy: 2.28%, Y: 0.57%, with the balance being Fe.

[0084] The alloy composition was prepared into iron-based amorphous alloy powder with a thickness of 15–53 μm. Iron-based amorphous alloy bulk materials were then prepared using selective laser melting (SLM). A laser with a spot diameter of 90 μm was selected, employing a scanning strategy of rotating the laser scanning direction by 90° per layer. The laser power was set to 150 W, the scanning speed to 800 mm / s, the scanning interval to 70 μm, and the powder layer thickness to 30 μm. The resulting additive manufacturing yielded bulk samples with dimensions of 10 × 10 × 2 mm. The prepared samples were then cut into two types: those parallel to the substrate and those perpendicular to the substrate.

[0085] Metallographic specimens were prepared and observed. The specimens showed no obvious defects such as pores, lack of fusion, or cracks, and the amorphous content was over 85%.

[0086] The Vickers hardness measured parallel to the substrate direction was 1250 HV, and the Vickers hardness measured perpendicular to the substrate direction was 1070 HV.

[0087] Comparative Example 4

[0088] A type of iron-based amorphous alloy suitable for additive manufacturing has the following chemical composition by mass percentage: Cr: 21.6%, Mo: 15.5%, B: 2.41%, C: 2.46%, Nb: 3.62%, V: 1.79%, Dy: 2.28%, Y: 0.59%, with the balance being Fe.

[0089] The alloy composition was made into iron-based amorphous alloy powder with a thickness of 15–53 μm. Iron-based amorphous alloy bulk material was prepared by selective laser melting. A laser with a spot diameter of 90 μm was selected. A scanning strategy of rotating the laser scanning direction by 90° for each layer was adopted. The laser power was set to 150 W, the scanning speed to 800 mm / s, the scanning interval to 70 μm, and the powder layer thickness to 30 μm. A bulk sample with a size of 10 × 10 × 2 mm was obtained by additive manufacturing.

[0090] Metallographic specimens were prepared and observed. Large pores and a small number of microcracks were observed inside the specimens.

[0091] Tables 1 and 2 present the components and test results for each embodiment.

[0092] Table 1. Composition table of specific embodiments (wt.%)

[0093]

[0094]

[0095] Note: The balance is Fe.

[0096] Table 2 Actual measured values ​​of various performance items

[0097]

[0098] The iron-based amorphous alloy prepared by this invention is not limited to the above additive manufacturing technology. The embodiments do not constitute a limitation on the scope of protection of this invention. Equivalent substitutions or changes made according to the technical solution and inventive concept of this invention shall all fall within the scope of protection of this patent.

Claims

1. A type of iron-based amorphous alloy suitable for additive manufacturing, characterized in that, Its chemical composition, by mass percentage, is: Cr: 20~22.5%; Mo: 15.2~16.1%; B: 1.9~2.8%; Si: 1.70~1.95%; C: 2.4~2.8%; Nb: 3.40~3.75%; V: 1.56~2.20%; Dy: 2.20~2.40%; Y: 0.50~0.69%, balance Fe; Prepared by the following steps: Iron-based amorphous alloy powder was used to prepare bulk materials by selective laser melting. A laser with a spot diameter of 90 μm was selected, and a scanning strategy of rotating the laser scanning direction by 90° for each layer was adopted. The laser power was set to 150 W to 250 W, the scanning speed to 800 to 1000 mm / s, the scanning spacing to 70 μm, and the powder layer thickness to 30 μm. The bulk sample of the iron-based amorphous alloy was additively manufactured on the substrate.

2. The method for additive manufacturing of iron-based amorphous alloys according to claim 1, characterized in that, Specifically, the steps include the following: Iron-based amorphous alloy powder was used to prepare bulk materials by selective laser melting. A laser with a spot diameter of 90 μm was selected, and a scanning strategy of rotating the laser scanning direction by 90° for each layer was adopted. The laser power was set to 150 W to 250 W, the scanning speed to 800 to 1000 mm / s, the scanning spacing to 70 μm, and the powder layer thickness to 30 μm. The bulk sample of the iron-based amorphous alloy was additively manufactured on the substrate.

3. The method for additive manufacturing of iron-based amorphous alloys according to claim 2, characterized in that, According to the designed component ratio, iron-based amorphous alloy powder is prepared by smelting, atomizing, and sieving in sequence.

4. The method for additive manufacturing of iron-based amorphous alloys according to claim 2, characterized in that, The particle size of the iron-based amorphous alloy powder is 15~53 μm.

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