Effect of Thermochemical and Surface Mechanical Treatments on the Microstructure, Properties and Fatigue Resistance of Steel 20Kh (20Cr4)

IF 0.5 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING

Metal Science and Heat Treatment Pub Date : 2025-07-28 DOI:10.1007/s11041-025-01124-7

V. P. Kuznetsov, A. V. Korelin, V. V. Voropaev, A. S. Yurovskikh, A. S. Skorobogatov

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Abstract

A comparative analysis of the structure, properties of the surface layer and fatigue resistance of samples of steel 20Kh (20Cr4) subjected to gas carburizing, quenching and low tempering with subsequent surface treatments — grinding, diamond burnishing or nanostructuring burnishing with a PSTM DBN tool after preliminary turning is carried out. Fatigue tests of cylindrical samples are performed using a bending-twisting scheme according to the ASTM E466-07 Standard, and their fractures are examined. It is shown that the surface layer with a nanocrystalline structure suppresses the development of fatigue cracks until 1.9 × 10⁵ test cycles of treatment at a load of 1000 MPa. The surface layer formed by the nanostructuring burnishing has a thickness of 8– 10 μm, a nanocrystalline structure, and a microhardness of 1185 HV_0.05; together with the deformed carburized layer with carbon concentration 0.97% at a distance of up to 125 μm from the surface it provides a higher fatigue resistance than the processing by grinding and diamond burnishing.

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热化学和表面机械处理对20Kh （20Cr4）钢组织、性能和抗疲劳性能的影响

对比分析了20Kh （20Cr4）钢样品经气体渗碳、淬火和低回火及后续表面处理（研磨、金刚石抛光或纳米结构抛光）后的结构、表层性能和抗疲劳性能。采用ASTM E466-07标准的弯曲-扭转方案对圆柱形试样进行了疲劳试验，并对其断裂进行了检查。结果表明，在1000 MPa载荷下，具有纳米晶结构的表面层抑制了疲劳裂纹的发展，直至处理1.9 × 105次试验循环。纳米结构抛光形成的表面层厚度为8 ~ 10 μm，为纳米晶结构，显微硬度为1185 HV0.05；在距表面125 μm处形成碳浓度为0.97%的变形渗碳层，其抗疲劳性能优于磨削和金刚石抛光。

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来源期刊

Metal Science and Heat Treatment 工程技术-冶金工程

CiteScore

1.20

自引率

16.70%

发文量

102

审稿时长

4-8 weeks

期刊介绍： Metal Science and Heat Treatment presents new fundamental and practical research in physical metallurgy, heat treatment equipment, and surface engineering. Topics covered include: New structural, high temperature, tool and precision steels; Cold-resistant, corrosion-resistant and radiation-resistant steels; Steels with rapid decline of induced properties; Alloys with shape memory effect; Bulk-amorphyzable metal alloys; Microcrystalline alloys; Nano materials and foam materials for medical use.