研究了21-6-9不锈钢在400 ～900℃退火过程中析出相的析出行为,采用热力学计算软件和微观结构检测技术对21-6-9不锈钢的析出相进行了表征.结果表明,在退火过程中21-6-9不锈钢的析出相为M23C6型碳化物,析出温度范围大致为630 ～850℃,其中析出敏感温度为800℃左右,M23 C6析出量随温度升高先增多后减少,析出相固溶温度为900℃左右.在700℃保温10 min后,晶界处有少量M23C6析出,随保温时间延长,M23C6析出量逐渐增多,且由晶界析出逐渐向晶内生长.
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