摘要
采用喷丸技术对高锰钢表面喷丸处理,利用透射电子显微镜及高分辨电子显微镜研究由表层沿厚度方向的结构变化特征,并对硬度沿厚度方向的变化进行分析。结果表明:经过表面喷丸处理,样品表面形成了厚度约为20μm的纳米晶层,表面纳米化的程度与塑性变形量有关,喷丸处理高锰钢表层明显强化。随层深减小,硬度急剧增加。高锰钢表层的加工硬化主要是由于晶粒细化,而与相变硬化无关。
By means of shot-peening technology shot peening on the surface of high Mn steel .The microstructure of the surface layer of the shot peening treated sample was characterized by using transmission electron microscopy （TEM） observations. The nanostruetured layer can reach to 20 μ m after the treatment. The surface of high Mn steel can be obviously strengthened by shot peening. The hardness is increased rapidly with the depth decreasing. Surface strain hardening is attributed to grains refinement, dislocation and twin. It does not result from phase transformation.
出处
《装备制造技术》
2008年第6期32-33,共2页
Equipment Manufacturing Technology
基金
国家高技术研究发展计划资助项目(2002AA302509)
广西大学科研基金项目(X071044)
关键词
高锰钢
喷丸
纳米晶
加工硬化
High Mn steel
Shot-peening
Nanocrystalline
Strain hardening
