摘要
研究了350、420、470、520、560、600、630℃时效温度下沉淀硬化不锈钢FV520(B)的TEM组织、硬度和示波冲击韧度。结果表明:时效过程中,FV520(B)钢主要以富铜相-εCu析出为主。硬度在420℃时效出现峰值,而韧性最差,主要与组织中细小富铜相共格析出有关。随着时效温度增加,富铜相逐步脱溶长大,基体再结晶,硬化程度逐步降低。FV520(B)钢的韧性主要决定于冲击裂纹扩展功。时效组织对FV520(B)钢冲击裂纹萌生功影响较小,对裂纹扩展功有着较大的影响。
TEM microstructure, hardness and instrumented impact toughness of precipitatationhardening stainless steel FV520 （B） aged at 350 ℃, 420 13,470 13,520 13,560 13,600 13 and 630 ℃ was investigated. The results show that the most precipitate of FV520（B） steel is copperrich phase E-Cu. The maximum hardness and lowest toughness are obtained after FV520（B） aged at 420 ℃, due to the coherent precipitation of fine copper particles. However, the hardness of FV520 （B） aged at higher than 420 ℃ gradually decrease, due to the ε-Cu precipitating and coarsening, the matrix recrystallizing. Toughness of FV520（B） at different aging temperatures is dependent on the crack propagation energy. The effect of aging microstructure on impact crack initiation energy is less, but the effect of that on crack propagation energy is great.
出处
《铸造技术》
EI
CAS
北大核心
2006年第9期921-924,共4页
Foundry Technology
关键词
时效处理
沉淀硬化不锈钢
微观组织
Aging treatment
Precipitatation-hardening stainless steel
Microstructure
