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金属学报  2013 

K480铸造镍基高温合金900℃高温时效过程中晶界粗化行为研究

DOI: 10.3724/SP.J.1037.2012.00428, PP. 63-70

Keywords: 镍基高温合金,锯齿形晶界,粗化行为,长期时效,JMAK方程

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Abstract:

铸造K480镍基高温合金经固溶、时效处理后,在900℃长期时效3000h.分别用OM和SEM对合金的晶界组织进行了观察,用EDS对合金中相的成分进行了测量.结果显示,K480合金的晶界为曲折的锯齿形晶界,该晶界由含碳化物晶界及含γ’晶界两部分构成.随着时效时间的延长,两部分晶界均发生粗化.其中含碳化物晶界中的MC碳化物分解形成M6C相和η相,并随时间长大;而含γ’晶界中不连续γ’相逐渐相连并形成γ’相条带.含碳化物晶界的粗化比要高于含γ’晶界,且随时效时间延长,二者的差异变大.用Johnson-Mehl-Avrami-Kolmogorov(JMAK)方程量化了时效过程中碳化物晶界和γ’晶界随时效时间的粗化行为,实验数据与计算结果吻合,表明二者的粗化行为随时间的演变规律是遵循着JMAK方程的变化形式.

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