A kind of high toughness iron alloy and its preparation method and application

A high-toughness, ferroalloy technology, applied in the field of alloys, can solve problems such as high Si content, lower hardness and wear resistance of knife rings, complex annealing process, etc.

Active Publication Date: 2021-08-06
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, CG-2 steel, as a mold steel with both cold and hot work, has high strength and fracture toughness, but the annealing process is more complicated; at the same time, in the process of forging CG-2 steel, CG-2 steel has cracking Tendency to affect the service life of CG-2 steel
ASTM-S5 steel is a kind of low-alloy cold work die steel. Under proper heat treatment process, its strength and toughness match well. The hardness and wear resistance of the knife ring make the knife ring more prone to wear and failure during service

Method used

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  • A kind of high toughness iron alloy and its preparation method and application
  • A kind of high toughness iron alloy and its preparation method and application
  • A kind of high toughness iron alloy and its preparation method and application

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preparation example Construction

[0035] The present invention also provides a method for preparing the high-toughness iron alloy described in the above technical solution, comprising the following steps:

[0036] According to the element mass ratio of the alloy described in the above technical scheme, the alloy raw materials are sequentially batched, smelted and forged to obtain the blank material;

[0037] Quenching the blank material to obtain a primary high-toughness ferroalloy;

[0038] The primary high-toughness iron alloy is tempered in two stages to obtain a high-toughness iron alloy.

[0039] In the present invention, unless otherwise specified, the raw materials in the present invention all adopt conventional commercially available products.

[0040] According to the element mass ratio of the alloy described in the above technical solution, the present invention sequentially batches, smelts and forges alloy raw materials to obtain blank materials. In the present invention, there is no special limit...

Embodiment 1

[0049] In terms of mass percentage, 0.6%C, 2%Cr, 1%Ni, 0.7%Si, 0.5%Mo, 0.4%V, 0.006%P, 0.005%S and 94.789%Fe are smelted, hot rolled after smelting A rough material with a diameter of 432mm and a thickness of 76mm;

[0050] The blank material was heated to 1030°C at a heating rate of 10°C / min, and kept at a temperature of 30 minutes; then cooled to room temperature with mechanical oil of type L-AN20 to obtain a primary high-toughness ferroalloy;

[0051] The primary high toughness iron alloy was heated to 520°C at a heating rate of 10°C / min, and kept for 120min, and then air-cooled to room temperature; the air-cooled alloy was heated to 510°C at a heating rate of 10°C / min, and Keep it warm for 120min, then air-cool to room temperature to obtain a high-toughness ferroalloy.

Embodiment 2

[0053] In terms of mass percentage, 0.5%C, 1.8%Cr, 0.9%Ni, 0.7%Si, 0.5%Mo, 0.4%V, 0.008%P, 0.007%S and 95.185%Fe; for smelting, heat after smelting Rolled into a rough material with a diameter of 432mm and a thickness of 76mm;

[0054] The blank material was heated to 1035°C at a heating rate of 8°C / min, and kept at a temperature of 30 minutes; then cooled to room temperature with mechanical oil of model L-AN30 to obtain a primary high-toughness iron alloy;

[0055] The primary high-toughness iron alloy was heated to 530°C at a heating rate of 10°C / min, and kept for 100 minutes, and then air-cooled to room temperature; the air-cooled alloy was heated to 510°C at a heating rate of 10°C / min, and Keeping it warm for 100 minutes, and then cooling to room temperature in air to obtain a high-toughness ferroalloy.

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Abstract

The invention belongs to the technical field of alloys, and in particular relates to a high-toughness iron alloy and its preparation method and application. The high-toughness iron alloy provided by the present invention includes the following elemental components in mass percentage: 0.5-0.65% C, 1.80-2.4% Cr, 0.6-1.2% Ni, 0.4-0.7% Si, 0.5-1.1% Mo, 0.15 ~0.4% V, 0~0.03% P, 0~0.03% S and the balance Fe. The lower content of Si in the high-toughness iron alloy provided by the invention avoids decarburization of the alloy material, and maintains a certain toughness while improving wear resistance; the higher content of Ni improves the toughness of the alloy; the VC formed by V and C Make the alloy have higher hardness and toughness; Mo can refine the grain of the alloy, improve the hardenability and thermal strength of the alloy, ensure that the alloy maintains sufficient strength and creep resistance at high temperatures, and improve the hardness and toughness.

Description

technical field [0001] The invention belongs to the technical field of alloys, and in particular relates to a high-toughness ferroalloy and its preparation method and application. Background technique [0002] The shield machine is a super-large mechanical equipment specially used for excavating hard rock formations. The shield machine uses the replaceable disc-shaped hob fixed on the cutter head to penetrate and roll the rock, and then gradually penetrate the tunnel. Knife rings are the most critical consumables for shield machines, and their usage costs can account for one-third of the total cost of tunnel construction. For construction under hard rock geological conditions, the cutter ring of the shield machine needs to withstand severe impact and friction, which makes the cutter ring extremely prone to wear and chipping failure. [0003] At present, the mainstream roadheader cutter ring material is a derivative steel grade of H13 (4Cr5MoSiV1), which has certain strength...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/44C22C38/46C21D1/18C21D6/00C21D8/00E21D9/08
CPCC21D1/18C21D6/004C21D6/008C21D8/005C22C38/002C22C38/02C22C38/44C22C38/46E21D9/08
Inventor 袁志钟张琰琳曹赟袁飞张伯承罗锐程晓农
Owner JIANGSU UNIV
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