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Heat treatment method for stainless steel products formed by SLM

A heat treatment method, stainless steel technology, applied to the improvement of process efficiency, additive manufacturing, additive processing, etc., can solve the problems of workpiece composition and structure differences, and achieve the effects of improving strength and toughness, eliminating anisotropy, and increasing hardness

Inactive Publication Date: 2019-08-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the thermal history of SLM molded parts and conventional castings is different, the composition and structure of the workpiece are also very different. The heat treatment process of traditional conventional molded parts (such as CN102899460B, CN102392107B, CN108754097A, etc.) is not completely suitable for SLM molding pieces

Method used

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  • Heat treatment method for stainless steel products formed by SLM
  • Heat treatment method for stainless steel products formed by SLM
  • Heat treatment method for stainless steel products formed by SLM

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A 40Cr13 stainless steel heat treatment process formed by SLM, the specific steps are as follows:

[0024] (1) Clean and dry the stainless steel sample formed by SLM, put it into a vacuum heat treatment furnace, and start heating in sections after the vacuum degree of the heat treatment furnace is stabilized within 5Pa (such as figure 1 shown);

[0025] (2) The heating rate in the first stage is set at 30°C / min, heated from room temperature to 800°C, and kept at this temperature for 10 minutes;

[0026] (3) After the first stage of heating and heat preservation is completed, the second stage of heating starts. The heating rate is set at 10°C / min, heated from 800°C to 1000°C, and kept at this temperature for 25 minutes;

[0027] (4) After the second stage of heating and heat preservation is completed, the stainless steel test piece is oil-quenched with 25°C vacuum quenching oil (THIF-517, the same below);

[0028] (5) Temper the stainless steel specimen within one hour...

Embodiment 2

[0031] A 40Cr13 stainless steel heat treatment process formed by SLM, the specific steps are as follows:

[0032] (1) Clean and dry the stainless steel sample formed by SLM, put it into a vacuum heat treatment furnace, and start segmental heating after the vacuum degree of the heat treatment furnace is stabilized within 5Pa;

[0033] (2) The heating rate in the first stage is set at 35°C / min, heated from room temperature to 700°C, and kept at this temperature for 15 minutes;

[0034] (3) After the first stage of heating and heat preservation is completed, the second stage of heating starts. The heating rate is set at 10°C / min, heated from 700°C to 1000°C, and kept at this temperature for 30 minutes;

[0035] (4) After the second stage of heating and heat preservation is completed, the stainless steel specimen is oil-quenched with vacuum quenching oil at 25°C;

[0036] (5) Temper the stainless steel test piece within one hour after the oil quenching is completed. The tempering...

Embodiment 3

[0038] A 40Cr13 stainless steel heat treatment process formed by SLM, the specific steps are as follows:

[0039] (1) Clean and dry the stainless steel sample formed by SLM, put it into a vacuum heat treatment furnace, and start segmental heating after the vacuum degree of the heat treatment furnace is stabilized within 5 Pa;

[0040] (2) The heating rate in the first stage is set at 40°C / min, heated from room temperature to 800°C, and kept at this temperature for 20 minutes;

[0041] (3) After the first stage of heating and heat preservation is completed, the second stage of heating starts. The heating rate is set at 10°C / min, heated from 800°C to 1050°C, and kept at this temperature for 35 minutes;

[0042] (4) After the second stage of heating and heat preservation is completed, the stainless steel specimen is oil-quenched with 50°C vacuum quenching oil;

[0043] (5) Temper the stainless steel test piece within one hour after the oil quenching is completed. The tempering t...

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Abstract

The invention relates to a heat treatment method for stainless steel products formed by SLM. The method comprises the following steps of firstly, heating the 40Cr13 stainless steel products formed bythe SLM to about 800 DEG C and holding for a period of time; heating to about 1000 DEG C and holding for a period of time; then quenching with oil at about 50 DEG C; and finally, tempering and air cooling at about 300 DEG C. According to the method, the anisotropy of the stainless steel products formed by the SLM is basically eliminated, the hardness, strength and toughness of the stainless steelproducts are improved, and the internal stress of the products is reduced; and the heat treatment method is simple, efficient and convenient to operate, and has good application prospects.

Description

technical field [0001] The invention relates to the technical field of processing stainless steel products, in particular to a heat treatment method for SLM formed stainless steel products. Background technique [0002] Selective Laser Melting (SLM) is a metal material additive manufacturing technology. This technology slices the part model to be prepared through software to obtain the two-dimensional profile data of each section, and then controls the high-power density laser beam to selectively melt the metal powder layer by layer according to the slice data to obtain the same metal part as the three-dimensional model. SLM is especially suitable for the manufacture of metal parts with complex structures, especially for parts with complex internal structures (such as cavities, variable-section pipes and spiral pipes, etc.), as well as complex parts that are difficult to manufacture or even cannot be directly manufactured by traditional forming methods . In addition, SLM c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18B22F3/105B22F3/24B33Y10/00
CPCC21D1/18B22F3/24B33Y10/00B22F2003/248C21D2211/002B22F10/00B22F10/28B22F10/64Y02P10/25
Inventor 朱晓萌刘贤东卢承旭杨和涛
Owner WUHAN UNIV OF TECH
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