几种不同原始硬度钢的喷丸强化行为与表征  

CHARACTERIZATION OF SHOT PENNING HARDENING FOR SEVERAL GROUPS OF SPRING STEEL HAVING DIFFERENT HARDNESS

作　　者：刘凤智[1] 李家宝[2] 

机构地区：[1]辽宁石油化工大学,辽宁抚顺113001 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《石油化工高等学校学报》2005年第1期51-54,共4页Journal of Petrochemical Universities

基　　金：国家自然科学基金资助项目(59371037)。

摘　　要：　材料硬度对喷丸强化具有很大的影响。目前表征喷丸强化常用的指标有显微硬度和X射线衍射半高宽,但从二指标出发会得出一些矛盾的结果。用X射线应力分析技术可以测得材料表面的应力,如此可得出表面屈服强度。通过改变热处理条件或化学成分得到的具有不同硬度材料的试验结果,喷丸强化处理可使软状态材料表面的半高宽值显著增大,同时也使其表面屈服强度有较大幅度的提高。喷丸使硬状态材料表面的半高宽大幅度减小,却使其表面屈服强度有不同程度的提高。对于中硬度表面,喷丸对半高宽影响不大,但使多数材料的表面屈服强度下降。这说明,用当前人们经常使用的半高宽参量来推断表面的强度可能得到错误的信息。表面屈服强度指标比通常应用的半高宽指标更能反映材料表面的力学特性。Material hardness has significant effects on shot penning hardening. The indexes which are frequently used so far to express shot penning hardening are half width of X-ray interference lines of the surface layer and the micro-hardness. But the conflict results will be got from the two indexes. The stress of material surface can be measured by X-ray stress analytic techniques, hence, the surface yield strength can be obtained. It is found in several groups of alloy steel having different hardness by changing the heat treatment regime or chemical constituents that shot penning strengthening treatment can increase the half width of the soft surface obviously, and at the same time, remarkably improving their yield strength. Shot penning reduces the half width of the hard surfaces wholly in a wide range, but it can improve the yield strength to varying degrees. As to the middle hard surfaces, the effect of shot penning on half width is weakness, but it reduced the yield strength for most part of the experimental surf aces. The result illustrates that wrong information may be concluded from the frequently-used method of deducing the surface strength from the parameter half width. The new index of the surface yield strength reflects mechanics characteristics of material surface better than the normally used index of the half width does.

关 键 词：硬度 半高宽 喷丸 表面屈服强度 

分 类 号：TG141[一般工业技术—材料科学与工程]