Amorphous inoculant for high chromium cast iron and its preparation method and use method

A high-chromium cast iron and inoculant technology, applied in the field of cast iron alloys, can solve problems such as the strength, toughness, and splitting that are unfavorable to high-chromium cast iron alloys, and achieve the effects of reducing the solidification temperature range, improving fluidity, and increasing nucleation cores

Active Publication Date: 2018-03-30
天津立鑫晟智能制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coarse cementite hard and brittle phases severely split the matrix, which is not conducive to the strength and toughness of high-chromium cast iron alloys

Method used

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  • Amorphous inoculant for high chromium cast iron and its preparation method and use method
  • Amorphous inoculant for high chromium cast iron and its preparation method and use method
  • Amorphous inoculant for high chromium cast iron and its preparation method and use method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Type 1 amorphous inoculant is prepared according to the following elements and weight percentages:

[0029] Re of 21, Si of 44, Ti of 2.0, B of 0.1, Cr of 0.6, the balance of Fe; or: 22 of Re, Si of 42, Ti of 1.0, B of 0.05, Cu of 0.5, the balance of Fe ; Or: 24 Re, 40 Si, 0.05 Ti, 0.2 Cr, 0.1 Cu, and the balance Fe.

[0030] The preparation method of type 1 amorphous inoculant: put the raw materials of the above-mentioned elements of type 1 with a particle size of 2-8 mm into the water-cooled copper crucible of the vacuum quenching furnace, and adjust the position of the electrode so that it is between the raw material alloy particles in the crucible The distance is 0.5 ~ 1.5mm, close the furnace door, inlet and outlet and air release valve, vacuumize to 3-4 × 10-3Pa and then fill with protective gas argon, the pressure in the vacuum quenching furnace is kept at -0.04 ~ - It can be within the range of 0.06Pa. After the arc is started, the arc current is adjusted to g...

Embodiment 2

[0036] Type 2 amorphous inoculants are prepared according to the following elements and weight percentages:

[0037] Re of 24.7, Si of 43, Ti of 2.0, B of 0.2, Cr of 0.6, the balance of Fe; or: Re of 26, Si of 41, Ti of 1.0, B of 0.1, Cu of 0.5, the balance of Fe ; Or: 27 Re, 39 Si, 0.05 Ti, 0.2 Cr, 0.1 Cu, and the balance Fe.

[0038] The preparation method and use method of the type 2 amorphous inoculant are the same as in Example 1.

[0039] figure 2 A is the metallographic diagram of BTMCr12-GT high-chromium cast iron without adding type 2 amorphous inoculant, the relative amount of matrix: 69.52%, and the distance between dendrites: 46.62 μm.

[0040] figure 2 B is the metallographic diagram of BTMCr12-GT high-chromium cast iron added with Type 2 amorphous inoculant (the first combination), the relative amount of matrix: 83.67%, and the distance between dendrites: 23.34 μm.

Embodiment 3

[0042] Type 3 amorphous inoculants are prepared according to the following elements and weight percentages:

[0043] Re of 27, Si of 42, Ti of 2.0, B of 0.3, Cr of 0.6, the balance of Fe; or: Re of 28, Si of 40, Ti of 1.0, B of 0.15, Cu of 0.5, the balance of Fe ; Or: 30 of Re, 38 of Si, 0.05 of Ti, 0.2 of Cr, 0.1 of Cu, and the balance of Fe.

[0044] The preparation method and usage method of Type 3 amorphous inoculant are the same as those in Example 1.

[0045] image 3 A is the metallographic diagram of BTMCr12-GT high-chromium cast iron without adding type 3 amorphous inoculant, the relative amount of matrix: 76.38%, and the distance between dendrites: 58.44 μm.

[0046] image 3 B is the metallographic diagram of BTMCr12-GT high chromium cast iron added with type 3 amorphous inoculant (the second combination), the relative amount of the matrix: 79.70%, and the distance between dendrites: 34.09 μm.

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Abstract

The invention discloses an amorphous nucleating agent for high-chromium iron and a preparation method and using method thereof. The amorphous nucleating agent for high-chromium iron is prepared from, by weight, 21-42 parts of Re, 32-44 parts of Si, 0.05-2 parts of Ti, 0-0.7 part of B, 0-0.6 part of Cr, 0-0.5 part of Cu and the balance Fe. The amorphous nucleating agent is prepared through a topspeed cooling method different from technological conditions in the prior art, and the additive amount of the amorphous nucleating agent is 0.03-0.12 WT.% that of a pouring ladle gray pig iron solution. According to the high-chromium iron obtained after inoculation treatment through the amorphous nucleating agent, a high hardness martensite matrix of the high-chromium iron can forcefully support fine carbide particles, the phenomenon that carbides fall down from a wear surface in the using process is avoided, and the wearing resistance of the material is improved.

Description

technical field [0001] The invention belongs to cast iron alloys, in particular to an amorphous inoculant for high chromium cast iron and a preparation method and application method thereof. Background technique [0002] High chromium cast iron is the abbreviation of high chromium white wear-resistant cast iron. It has become a kind of convenient production because of its wear resistance superior to alloy steel, toughness and strength superior to ordinary white cast iron, and good high temperature resistance and corrosion resistance. It is one of the wear-resistant metal materials with moderate cost and excellent performance. With the continuous development of construction machinery, higher and higher requirements are put forward for the mechanical properties of high chromium cast iron wear parts. [0003] Experimental studies have found that high chromium cast iron can obtain martensite, retained austenite matrix and special carbides of chromium through high alloying and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/08C21C1/08
CPCC21C1/08C22C33/08
Inventor 石卫东刘清信王晶宋文涛
Owner 天津立鑫晟智能制造有限公司
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