40CrNi2Si2MoVA钢喷丸强化层微观结构  

Microstructure of Surface Layer of 40CrNi2Si2MoVA Steel after Shot-peening

作　　者：刘天琦[1] 李春志[1] 盛伟[1] 王强[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《航空材料学报》2016年第2期28-32,共5页Journal of Aeronautical Materials

摘　　要：喷丸强化在金属材料表面形成强化层,可以有效提高构件的疲劳寿命,是金属构件表面完整性制造的重要方法。喷丸强化已有效应用于40CrNi2Si2MoVA钢制构件,为了探明喷丸强化对该钢种的强化机理,本工作采用高分辨电子显微电镜(HREM)对40CrNi2Si2MoVA钢喷丸强化层微观组织结构进行了系统分析研究。结果表明:喷丸强化使40CrNi2Si2MoVA钢组织细化,呈明显的马氏体"有效晶粒"现象,"有效晶粒"尺寸为几个纳米到几十个纳米;"有效晶粒"界面呈明显的倾转现象,相邻"有效晶粒"间转动角度为几度到几十度,最大达到30°。A strengthen layer can be formed on the surface of metal materials via shot peening strengthening,and the fatigue life of component could be prolong substantially. Shot peening is an important method to construct the surface integrity of metal component. In order to investigate the strengthening mechanism of 40 Cr Ni2Si2Mo VA steel,the microstructure of 40 Cr Ni2Si2Mo VA steel with shot peening has been studied using high-resolution electron microscope（ HREM）. The experimental results show that the microstructure of surface layer of 40 Cr Ni2Si2Mo VA steel is refined after shot peening,and the martensite＂effective grain＂phenomenon can be observed clearly. The sizes of the ＂effective grain＂are from several to tens of nanometers,and the interface between ＂effective grains＂shows twisting phenomenon apparently. The twisting angles between＂effective grains＂are from several to tens of degrees,and the largest angle reaches 30°.

关 键 词：40CrNi2Si2MoVA钢 喷丸强化 微观结构 

分 类 号：TG142.41[一般工业技术—材料科学与工程]