采用500℃,10.3 MPa过热蒸汽腐蚀方法,研究了热处理对Zr-4合金耐疖状腐蚀性能的影响.试样经过600,820和1000℃不同热处理后,耐疖状腐蚀性能明显不同.提高Fe,Cr合金元素在α-Zr中过饱和固溶含量,可以明显改善耐疖状腐蚀性能,第二相的大小不是决定的因素.用高分辨扫描电镜观察了氧化膜的内表面形貌和断口形貌,研究了耐疖状腐蚀性能与氧化膜显微组织之间的关系.从疖状腐蚀斑的成核与长大,热处理会引起Fe和Cr合金元素在α-Zr中过饱和固溶含量的变化,以及从氧化膜生长的各向异性与α-Zr中合金元素过饱和固溶含量的关系出发,讨论了热处理影响耐疖状腐蚀性能的机制.
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