700℃服役8万h后析出大量σ相AISI 321不锈钢的再利用  

Recycle of AISI 321 Stainless Steel with a Large Number of Precipitated σ Phases after Serving for 80 000 Hours at 700℃

作　　者：马海涛[1] 郭林海[1] 赵艳辉[1] 赵杰[1] 高路斯[1] 

机构地区：[1]大连理工大学材料科学与工程学院,大连116024

出　　处：《机械工程材料》2014年第1期28-31,共4页Materials For Mechanical Engineering

基　　金：中国石油科技创新基金研究项目(2010D-5006-0704)

摘　　要：以在700℃服役8万h后因组织中析出了大量σ相而报废的AISI 321不锈钢为对象,对其进行不同工艺的固溶处理,研究了固溶处理前后的组织和高温力学性能,并重点关注了固溶处理后组织和高温力学性能的恢复情况。结果表明:固溶处理可以使σ相溶解消失;在1 050℃固溶处理2h后,报废不锈钢的组织和高温力学性能得到很好的恢复,并符合行业标准规定的性能要求,该处理工艺为报废AISI 321不锈钢组织和性能恢复的最佳工艺。Scrapped AISI 321 stainless steel with a large number of σ precipitated phases after serving for 80 000 hours at 700 ℃ was treated by different solid-solution treatment processes to study the microstructure and high-temperature mechanical properties of the stainless steel before and after solid-solution treatment and the focuse was on the recovery of microstructure and high-temperature mechanical properties after solid-solution treatment. The results show that solid-solution treatment could make σ phase dissolved and eliminated. After solid-solution treatment at 1 050 ℃ for 2 h, the microstructure and the high-temperature mechanical properties of the stainless steel got a good recovery and complied with the performance requirement of industry standard, and the solid solution process was a best route to recover the microstructure and properties of AISI 321 stainless steel.

关 键 词：AISI321奥氏体不锈钢 Σ相 再制造 高温持久性能 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TG156.94[金属学及工艺—金属材料]