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预处理工艺对42CrMo钢激光-感应复合相变硬化层晶粒尺寸及耐磨性的影响

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

作者信息

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

机构信息

College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.

Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310014, China.

出版信息

Materials (Basel). 2025 Jun 7;18(12):2695. doi: 10.3390/ma18122695.

DOI:10.3390/ma18122695
PMID:40572828
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12194190/
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.

摘要

为解决42CrMo钢激光-感应复合相变过程中表面晶粒粗化的问题，本研究调查了四种预处理工艺（调质（QT）、激光-感应淬火（LIQ）、激光-感应正火（LIN）和激光-感应退火（LIA））对激光-感应复合相变后奥氏体晶粒尺寸和耐磨性的影响。结果表明，QT导致回火索氏体组织，由于形核位置稀疏，奥氏体晶粒粗大（139.8μm）。LIQ生成板条马氏体，其高位错密度和大角度晶界导致晶粒更大（145.5μm）。相比之下，LIN和LIA分别形成贝氏体和粒状珠光体，它们通过密集形核和晶界钉扎细化了奥氏体晶粒（78.8μm和75.5μm）。激光-感应复合相变后，所有试样的硬化层深度均超过6.9mm。当预处理为LIN或LIA时，激光-感应复合相变后的试样表面显微硬度值分别为760.3HV0.3和765.2HV0.3，比QT和LIQ预处理的试样高12%至15%，主要是由于细晶强化。摩擦系数从QT和LIQ预处理试样的0.52降至LIN和LIA预处理试样的0.45，降低了约20%。结果证实，通过预处理调节初始微观组织可有效抑制奥氏体晶粒粗化，从而提高相变后的显微硬度和耐磨性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dd90/12194190/acfd416c596a/materials-18-02695-g014.jpg
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