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Preparation method of hydrogen-infiltration-resistant surface in situ nanocrystallized bainitic steel

A kind of bainitic steel and nanotechnology, applied in the field of surface in-situ nanotechnology, can solve the problems of high delayed fracture resistance, low hydrogen embrittlement sensitivity, etc., and achieve the effects of strengthening the surface, hindering hydrogen infiltration, and simple preparation methods

Pending Publication Date: 2020-09-25
YANSHAN UNIV +1
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Problems solved by technology

[0005] The technical problem to be solved in the present invention is to provide a method for preparing a surface in-situ nano-sized bainitic steel resistant to hydrogen infiltration, using the latest optimization mechanism without the need for a heat source and without instantaneous severe plastic deformation. The matrix produces a core formed by a large number of nanocrystals, thereby preparing a unique surface nanocrystal layer, which can effectively prevent the infiltration of external hydrogen, thereby obtaining ultra-low hydrogen embrittlement susceptibility and extremely high delayed fracture resistance

Method used

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  • Preparation method of hydrogen-infiltration-resistant surface in situ nanocrystallized bainitic steel

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Embodiment

[0036] The chemical composition (wt%) of the base steel is: C0.30, Mn2.2, Al0.98, Cr1.2, Ni0.23, Mo0.24, Si1.1, S0.0015, P0.006, and the rest is Fe .

[0037] The preparation method is:

[0038] S1: Heat the base steel to 920°C and keep it warm for 40 minutes;

[0039] S2: Put the heated and heat-preserved base steel at 350°C for salt bath treatment and heat-preserve for 1.5 hours, then air-cool;

[0040]S3: Process the base steel after air-cooling treatment into a rolling contact sample. The sample is a ring with an outer diameter of 80mm, an inner diameter of 60mm, and a thickness of 8mm. The sample is tested on an online rolling contact fatigue testing machine. The experimental environment is room temperature. Air environment; the contact stress is 1700MPa, the slip rate is 3%, the speed is 800rpm, and the operation cycle is 1.0×10 6 Week.

[0041] Cut the surface sample of the sample, and use the scanning electron microscope to observe the microstructure, such as figu...

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Abstract

The invention discloses a preparation method of hydrogen-infiltration-resistant surface in situ nanocrystallized bainitic steel, and belongs to the technical field of high-strength alloy steel. The preparation method comprises the following steps of (1), heating matrix steel to 900 DEG C to 950 DEG C to perform complete austenitizing, and performing heat preservation for 20min to 40min; (2), quickly immersing the matrix steel subjected to heating and heat preservation treatment in a salt bath at a temperature of 260 DEG C to 350 DEG C, performing the heat preservation for 1.5h to 3h, and thenperforming air cooling; and (3), under certain contact stress, rolling the air-cooled matrix steel for certain cycles in a contact manner by a rolling contact device with a slip ratio, so that a nanocrystalline layer is subsequently generated on the surface of the air-cooled matrix steel, to obtain the hydrogen-infiltration-resistant surface in situ nanocrystallized bainitic steel. A matrix material is bainitic steel with a carbon content of 0.30% to 0.40%, and contains second-phase particles of dozens of nanometers to hundreds of nanometers. The nanocrystalline layer in the bainitic steel obtained by using the preparation method plays a role in impeding hydrogen infiltration, and can be used for effectively decreasing hydrogen embrittlement sensitivity and improving delayed fracture resisting performance.

Description

technical field [0001] The invention relates to the technical field of high-strength alloy steel, in particular to a surface in-situ nano [0002] The preparation method of the bainitic steel is used for rolling contact basic parts such as bearings with high requirements on surface fatigue wear performance, and can also be used for other important structural materials with high performance requirements for hydrogen embrittlement and delayed fracture characteristics. Background technique [0003] Nanomaterials have excellent mechanical and chemical properties, and extensive research has been done on nanomaterials at home and abroad. In some structural parts, the performance of the surface plays a key role. At present, a variety of surface nano-processing methods have been realized in the laboratory, and some have been applied to practical engineering. With the increasing research on surface nanotechnology, many domestic methods have been reported on the surface nanotechnolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/20C21D7/04C22C38/44C22C38/58C22C38/06C22C38/02
CPCC21D1/20C21D7/04C21D2211/001C21D2211/002C21D2211/008C22C38/002C22C38/02C22C38/06C22C38/44C22C38/58
Inventor 郑春雷张福成于金库张瑞杰李艳国杨永强
Owner YANSHAN UNIV
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