High-ductility maraging steel with excellent fatigue resistance and preparation method thereof

A maraging steel, anti-fatigue technology, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve problems such as microscopic yield-induced cracks, and achieve the effect of improving strength and plasticity

Active Publication Date: 2021-07-23
ANSTEEL BEIJING RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Under the high cycle fatigue mechanism, although the load is lower than the yield strength of the material, due to the inhomogeneity of the material structure or the defects on the surface, the microscopic yield is possible and the crack initiation is stimulated

Method used

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  • High-ductility maraging steel with excellent fatigue resistance and preparation method thereof
  • High-ductility maraging steel with excellent fatigue resistance and preparation method thereof
  • High-ductility maraging steel with excellent fatigue resistance and preparation method thereof

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preparation example Construction

[0031] The method for preparing a high ductility maraging steel with excellent fatigue resistance according to an embodiment of the present invention includes the following steps:

[0032] a. Melting maraging steel raw materials into molten steel under vacuum and pouring into ingots;

[0033] b. The ingot in the step a is subjected to tissue homogenization treatment, forged into a slab, and air-cooled to room temperature;

[0034] Then carry out tissue homogenization treatment, and then carry out hot rolling treatment, and air-cool the obtained plate to room temperature;

[0035] c. Homogenizing the microstructure of the plate obtained in step b, followed by quenching, annealing, and re-quenching to obtain a high-ductility maraging steel.

[0036] According to the advantages and technical effects brought by the preparation method of high-ductility maraging steel with excellent fatigue resistance according to the embodiment of the present invention, 1. The method of the embodi...

Embodiment 1

[0046] The raw material of maraging steel is smelted in a vacuum induction furnace with a furnace temperature of 1520°C and cast into an ingot. The ingot structure was homogenized, heated to 1150°C, treated at a constant temperature for 2.5 hours, then forged into a slab with a thickness of 75mm, and then air-cooled to room temperature. Homogenize the structure of the slab again, heat it to 1200°C, hold a constant temperature treatment for 3 hours, and then carry out hot rolling treatment, in which the starting rolling temperature is 1150°C, the final rolling temperature is 900°C, and the pass is 5 times to obtain a plate thickness of 15mm The plate was cooled to room temperature by air cooling. The rolled structure is homogenized, heated to 1000°C, treated at a constant temperature for 1.5h, quenched in brine, and then annealed. The annealing temperature is 500°C, and the annealing time is 3h. Body aged steel.

[0047] Such as figure 1 As shown, the morphology of retained ...

Embodiment 2

[0052] The maraging steel raw material is smelted in a vacuum induction furnace with a furnace temperature of 1500°C and cast into an ingot. The ingot structure was homogenized, heated to 900°C, treated at a constant temperature for 4 hours, then forged into a slab with a thickness of 60mm, and then air-cooled to room temperature. Homogenize the structure of the slab again, heat it to 1050°C, and treat it at a constant temperature for 3.5 hours, and then perform hot rolling treatment, wherein the starting rolling temperature is 1150°C, the final rolling temperature is 900°C, and the pass is 4 times, and the plate thickness is obtained. 25mm plate, cooled to room temperature by air cooling. The rolled structure is homogenized, heated to 910°C, treated at a constant temperature for 2 hours, quenched in normal temperature water, and then annealed. The annealing temperature is 400°C, and the annealing time is 8 hours. Tempered aging steel.

[0053] In the performance test, the s...

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Abstract

The invention discloses a preparation method of high-ductility maraging steel with excellent fatigue resistance. The preparation method comprises the steps of vacuum melting, forging after structure homogenization, hot rolling after structure homogenization, quenching after structure homogenization, annealing and quenching, and finally the high-ductility maraging steel with excellent fatigue resistance is obtained. According to the method of the invention, through annealing-quenching, the austenite proportion in a material is increased, the content of intermetallic compounds is regulated and controlled, and then the fatigue resistance of the material is improved. The invention also discloses the high-ductility maraging steel with the excellent fatigue resistance prepared by the method, the Vickers hardness of the material is greatly improved, the tensile strength is high, the ductility is good, the average elongation is high, and the high-ductility maraging steel has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of new materials, in particular relates to a high ductility maraging steel with excellent fatigue resistance, and in particular to a preparation method of the high ductility maraging steel with excellent fatigue resistance. Background technique [0002] Automobiles have become an important means of transportation for human travel, and the automotive industry has put forward higher requirements for the performance of automotive steel, and there is a great demand for automotive steel with excellent fatigue resistance. Fatigue fracture is the main form of failure of metal materials, which includes three stages: crack initiation, crack propagation, and fracture. According to the characteristics of fatigue failure mechanism, it can be divided into low cycle fatigue (10 4 <N f <10 5 ), high cycle fatigue (10 5 <N f <10 7 ), ultra-high cycle fatigue (N f >10 7 ). Under the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/26C21D6/00C21D8/02C21D9/00C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14
CPCC21D8/0226C21D9/0081C21D1/18C21D1/26C21D6/001C21D6/005C21D6/008C22C38/06C22C38/08C22C38/04C22C38/12C22C38/14C22C38/02C21D2211/008
Inventor 张昭李应焕信瑞山刘斌
Owner ANSTEEL BEIJING RES INST
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