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1.前言 由于奥氏体系不锈钢的机械性能和耐腐蚀性都很优良,所以一般大多用作结构材料。但是众所周知,它在苛刻的腐蚀环境下会发生晶界腐蚀和点蚀等局部腐蚀。认为这些局部腐蚀是由于夹杂物或杂质元素沿着晶粒边界偏析而造成。为了改善作为结构用材料奥氏体钢的耐腐蚀性,认有消除这些偏析产生的场所是一种有效手段。特别是去除晶界,即单晶化能大大提高奥氏体钢的耐蚀性,另外从学术上来讲也具有深远的意义。因此,本研究
1. Introduction Since austenitic stainless steel is excellent in mechanical properties and corrosion resistance, it is generally used as a structural material. However, it is well known that it undergoes localized corrosion such as grain boundary corrosion and pitting corrosion under harsh corrosive environment. It is believed that these localized corrosion is due to segregation of inclusions or impurity elements along grain boundaries. In order to improve the corrosion resistance of austenitic steel as a structural material, it is recognized that the elimination of these segregation sites is an effective method. In particular, the removal of grain boundaries, that is, single-crystal can greatly improve the corrosion resistance of austenitic steel, the other is also of far-reaching academic significance. Therefore, this study