锻压技术

超声滚压力对T2A钢车轮表面组织、硬度及残余应力的影响

英文标题：Influence of ultrasonic rolling force on surface structure, hardness and residual stress for T2A steel wheel

作者：刘涛康皓

分类号：TG663

出版年,卷(期):页码：2020,45(11):101-105

摘要：

为了强化T2A钢车轮表面的综合性能，采用超声滚压强化技术对其表面进行了处理。通过实验测试，分析了超声滚压力对T2A钢车轮的表面组织、硬度及残余应力的影响。研究结果表明：试样的表面晶粒均出现了明显的变形，变形层的厚度随着超声滚压力的上升而显著增大。表面附近的组织发生了强烈的塑性变形，随着超声滚压力增大至300与400 N，钢表层形成了更加细小的纳米晶，还产生了部分非晶态结构。钢的塑性变形可以引起表层出现加工硬化现象，此外，晶粒细化也会增大表层硬度。随着超声滚压力继续增大为400与500 N，距表面100 μm区域的硬度依次为352与358 HV。T2A钢表面的最大残余压应力分布表现为随超声滚压力增大而上升。当超声滚压力增大后，试样基体中残余应力的作用深度也会明显增加，超声滚压力的增大还能扩大残余压应力的作用深度。

In order to enhance the comprehensive performance of T2A steel wheel surface, the surface was treated by the ultrasonic rolling reinforcement technology, and the influences of ultrasonic rolling force on surface structure, hardness and residual stress of T2A steel wheel were analyzed by experiment. The results show that the grains on the surface of sample have an obvious deformation, and the deformation layer thickness increases significantly with the increasing of ultrasonic rolling force. The microstructure near the surface produces strong plastic deformation, and as the ultrasonic rolling force increases to 300 and 400 N, the steel surface forms finer nanocrystals and produces some amorphous structures. The plastic deformation of steel causes work hardening on the surface. In addition, the grain refinement increases the hardness of surface. As the ultrasonic rolling force continues to increase to 400 and 500 N, the hardnesses of 100 μm from the surface are 352 and 358 HV respectively. The distribution of the maximum residual compressive stress on the surface of T2A steel shows a rising trend with the increasing of ultrasonic rolling force. When the ultrasonic rolling force increases, the effect depth of residual stress in the sample matrix also increases significantly, and the increase of ultrasonic rolling force also expands the effect depth of residual compressive stress.

基金项目：

甘肃省科技厅项目（1610RJZA044）

刘涛(1986-)，男，学士，工程师 E-mail：jiongpingshizhuang@126.com

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