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金属学报  2010 

镍基合金焊接过渡区微观结构及应力腐蚀行为研究

DOI: 10.3724/SP.J.1037.2010.00236, PP. 1258-1266

Keywords: 镍基合金,同种/异种金属焊接,微观结构,残余应变,应力腐蚀开裂

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Abstract:

利用微观分析手段深入分析了镍基合金690-52同种金属焊接和镍基182合金-A533B低合金钢异种金属焊接的焊接过渡区微观结构,定量测量了同种金属焊接热影响区(HAZ)残余应变分布,用带缝隙的弯曲横梁样品模拟了异种金属焊接过渡区在高温含氧水中的应力腐蚀开裂(SCC)行为.结果表明,同种金属焊接过渡区的HAZ具有残余应变峰值、敏感的晶界微观结构,因而导致最高的SCC敏感性;异种金属焊接过渡区具有复杂的微观结构和成分分布,典型特征是靠近熔接线(FB)的熔合区(FZ)内形成平行于FB的type-II和连接FB与type-II的type-I晶界,type-II具有高的SCC敏感性和裂纹扩展速率,type-I引导裂纹向FB扩展,裂纹到达FB后发生点蚀钝化停止扩展,FB起阻碍裂纹进一步向低合金钢扩展的作用.

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