Effects of Pretreatment Processes on Grain Size and Wear Resistance of Laser-Induction Hybrid Phase Transformation Hardened Layer of 42CrMo Steel.

Qunli Zhang, Peng Shen, Zhijun Chen, Guolong Wu, Zhuguo Li, Wenjian Wang, Jianhua Yao

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Article in Materials (Basel, Switzerland), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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7 authors.

Qunli ZhangCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.ORCID 0000-0002-9950-1651

Peng ShenCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.

Zhijun ChenCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.

Guolong WuCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.

Zhuguo LiCollege of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

Wenjian WangCollege of Mechanical Engineering, Southwest Jiaotong University, Chengdu 611756, China.

Jianhua YaoCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.

Funding

"Elite" Program of Zhejiang Province 2024SJCZX0040National Key Research and Development Program of China 2023YFB4603400Zhejiang Provincial Special Support Plan for High-Level Talents 2023R5210

6 · The paper itself

Abstract

To address the issue of surface grain coarsening in laser-induction hybrid phase transformation of 42CrMo steel, this study investigated the effects of four pretreatment processes (quenching-tempering (QT), laser-induction quenching (LIQ), laser-induction normalizing (LIN), and laser-induction annealing (LIA)) on the austenite grain size and wear resistance after laser-induction hybrid phase transformation. The results showed that QT resulted in a tempered sorbite structure, resulting in coarse austenite grains (139.8 μm) due to sparse nucleation sites. LIQ generated lath martensite, and its high dislocation density and large-angle grain boundaries led to even larger grains (145.5 μm). In contrast, LIN and LIA formed bainite and granular pearlite, respectively, which refined austenite grains (78.8 μm and 75.5 μm) through dense nucleation and grain boundary pinning. After laser-induction hybrid phase transformation, all specimens achieved hardened layer depths exceeding 6.9 mm. When the pretreatment was LIN or LIA, the specimens after laser-induction hybrid phase transformation exhibited surface microhardness values of 760.3 HV0.3 and 765.2 HV0.3, respectively, which were 12 to 15% higher than those of the QT- and LIQ-pretreated specimens, primarily due to fine-grain strengthening. The friction coefficient decreased from 0.52 in specimens pretreated by QT and LIQ to 0.45 in those pretreated by LIN and LIA, representing a reduction of approximately 20%. The results confirm that regulating the initial microstructure via pretreatment effectively inhibits austenite grain coarsening, thereby enhancing the microhardness and wear resistance after transformation.

Indexed as

42CrMo steelaustenite grainlaser-induction hybrid phase transformationpretreatment processwear-resistant properties

Identifiers

PMID40572828

DOI10.3390/ma18122695

PMCPMC12194190

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