切削过程中高强合金钢浅表层性态强化研究

doi:10.3901/JME.2021.23.262

机械工程学报 ›› 2021, Vol. 57 ›› Issue (23): 262-272.doi: 10.3901/JME.2021.23.262

• 制造工艺与装备 • 上一篇

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切削过程中高强合金钢浅表层性态强化研究

蒋宏婉^1,2, 王成勇², 任仲伟¹, 陈汪林², 何林³

1. 贵州理工学院机械工程学院贵阳 550003;
2. 广东工业大学机电工程学院广州 510006;
3. 六盘水师范学院六盘水 553004

收稿日期:2020-12-09 修回日期:2021-10-14 出版日期:2021-12-05 发布日期:2022-02-28
通讯作者: 王成勇(通信作者),男,1964年出生,博士,教授,博士研究生导师。主要研究方向为难加工材料的高速高效超精密加工理论、刀具与装备。E-mail:cywang@gdut.edu
作者简介:蒋宏婉,女,1988年出生,博士,副教授。主要研究方向为难加工材料切削刀具设计与失效分析、表面质量评价。E-mail:hwjiang@git.edu.cn
基金资助:
国家自然科学基金（51765009）和贵州省科技计划（黔科合基础[2020]1Y234）资助项目。

Behavior Strengthening of Superficial Layer of High Strength Alloy Steel in Machining Process

JIANG Hongwan^1,2, WANG Chengyong², REN Zhongwei¹, CHEN Wanglin², HE Lin³

1. School of Mechanical Engineering, Guizhou Institute of Technology, Guiyang 550003;
2. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006;
3. Liupanshui Normal University, Liupanshui 553004

Received:2020-12-09 Revised:2021-10-14 Online:2021-12-05 Published:2022-02-28

摘要/Abstract

摘要： 切削浅表层显微结构状态对机械构件力学性能和服役寿命有重要影响。为获得性能优良的切削表层，综合应用理论计算和测试分析的研究手段，对不同切削速度下高强合金钢浅表层微观结构演变和力学性能强化的内在关联展开研究。结果表明：中高切削速度能够相对最大程度实现高强钢切削表层梯度微观结构的形成，由表及里分别为致密纳米等轴晶所在的回复层，高密度亚结构聚集的流变层和晶粒残留畸变状态的畸变层。中高切速下平均晶粒尺寸相对最小（392.1 nm），同时位错密度相对最高（1.072 5×10¹² cm^-2），变形应变、位错和小角度晶界等亚结构均高度集中于流变层。经性能测试发现，中高切速实现了高强合金钢切削浅表层硬度、表面质量和韧性的同时提升，这是上述中高切速带来的微观结构变化所形成的细晶强化和位错强化综合作用的结果。

关键词: 高强合金钢, 微观结构, 浅表层, 梯度分布, 表面性能

Abstract: Microstructures of the cutting superficial layer has an important influence on the service performance of mechanical components. To obtain machined surfaces with excellent performance, theoretical calculation and test analysis were carried out to investigate the internal correlation between microstructure evolution and mechanical property enhancement of superficial layers of high-strength alloy steel (HSAS) under different cutting velocities. Results showed that the medium-high cutting velocity can achieve the formation of gradient microstructures of machined surfaces of HSAS maximally. From the outside to the inside, they are respectively the recovery layer where dense nano equiaxed crystals are located, and the rheological layer with high-density substructure and the distorted layer where grains are in the residual distortion. The average grain size is relatively smallest (392.1 nm) at medium-high speeds, and the dislocation density is relatively highest (1.072 5×10¹² cm^-2). Substructures such as deformation strain, dislocations and small-angle grain boundaries are highly concentrated in the rheological layer. Based on performance test experiments, it was also found that The medium-high cutting speed achieves the simultaneous improvement of the hardness, surface quality and toughness of the superficial layer of HSAS, which is the result of the combined effect of the fine grain strengthening and the dislocation strengthening formed by the microstructure changes above brought about by medium-high cutting velocity.

Key words: high-strength alloy steel, microstructure, superficial layer, gradient-distribution, surface performances

中图分类号:

TG712

蒋宏婉, 王成勇, 任仲伟, 陈汪林, 何林. 切削过程中高强合金钢浅表层性态强化研究[J]. 机械工程学报, 2021, 57(23): 262-272.

JIANG Hongwan, WANG Chengyong, REN Zhongwei, CHEN Wanglin, HE Lin. Behavior Strengthening of Superficial Layer of High Strength Alloy Steel in Machining Process[J]. Journal of Mechanical Engineering, 2021, 57(23): 262-272.

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切削过程中高强合金钢浅表层性态强化研究

Behavior Strengthening of Superficial Layer of High Strength Alloy Steel in Machining Process

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