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中文摘要：
选用304奥氏体不锈钢进行喷丸强化和表面机械研磨等硬球冲击强化.采用X射线衍射和透射电子显微分析技术测定304奥氏体不锈钢冲击强化形成的微观组织结构变化,并进行室温下的拉伸实验,研究冲击强化对微观组织与拉伸性能的影响.结果表明：冲击强化导致奥氏体转变为马氏体,而且表层晶粒明显细化,这提高了屈服强度和抗拉强度等拉伸性能.
英文摘要：
304 austenite stainless steel was shot peened （SP） and surface mechanical attrition treated （SMAT）. Microstructure changes caused by impact enhancements were determined by X-ray diffrac- tion and transmission electron microscopy. Moreover, the effect of impact enhancements on the micro- structure and tensile property was studied. The results show that austenite transforms to martensite induced by impact at the surface enhanced layer and that fine grains are formed in the severe plastic de- formed surface layer. These changes increase yield strength and tensile strength.
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