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

金属学报, 2013, 49(1): 63-70. doi: 10.3724/SP.J.1037.2012.00428

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

曾强 ^1, , 燕平 ^2, , 邵冲 ^3, , 赵京晨 ^4, , 韩凤奎 ^5, , 张龙飞 ^6,

1.钢铁研究总院高温材料研究所,北京100086;钢铁研究总院高温合金新材料北京重点实验室,北京100086

2.钢铁研究总院高温材料研究所,北京,100086

3.钢铁研究总院高温材料研究所,北京,100086

4.钢铁研究总院高温材料研究所,北京,100086

5.钢铁研究总院高温材料研究所,北京,100086

6.钢铁研究总院高温材料研究所,北京,100086

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

INVESTIGATION ON COARSENING BEHAVIORS OF SERRATED GRAIN BOUNDARIES IN K480 NICKEL BASE SUPERALLOY DURING LONG TERM AGING AT 900℃

铸造K480镍基高温合金经固溶、时效处理后,在900℃长期时效3000 h.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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