摘要
研究了不同时效温度下的沉淀硬化不锈钢0Cr14Ni5Mo2Cu2Nb的TEM组织、硬度和冲击韧性。结果表明:时效过程中,0Cr14Ni5M02Cu2N钢主要以ε-Cu相析出为主。时效温度为420℃时,Cu以细小共格ε-Cu相析出,导致0Cr14Ni5Mo2Cu2N钢的硬度达到峰值,而韧性最差,冲击断口以解理为主。随着时效温度增加,ε-Cu相逐步脱溶长大,基体再结晶,硬化程度逐步降低,韧性升高,冲击断口逐步过渡为全韧窝形貌。0Cr14Ni5Mo2Cu2Nb钢的韧性主要决定于冲击裂纹扩展功。时效组织对0Cr14Ni5Mo2Cu2Nb钢冲击裂纹形成功影响较小,对裂纹扩展功有着较大影响。
TEM microstructure, hardness and instrumented impact toughness of precipitation-hardening stainless steel 0Cr14Ni5Mo2Cu2Nb aged at different temperatures were investigated. The results show that the most precipitate of 0Cr14NiSMo2Cu2Nb steel is copper-rich phase ε-Cu. After 0Cr14NiSMo2Cu2Nb was aged at 420℃, the maximum hardness and lowest toughness were obtained and the fracture appearance of impact specimens was in the form of cleavage, due to the coherent precipitation of fine copper particles. However, as aged at higher temperatures, the hardness of 0Cr14NiSMo2Cu2Nb gradually decreased ,but its toughness gradually increased and fracture appearance of impact specimens transited to the form of dimple, due to the ε -Cu precipitating and coarsening, the matrix recrystallizing. Toughness of 0Cr14Ni5Mo2Cu2Nb 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 greater.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2006年第A02期409-412,共4页
Rare Metal Materials and Engineering
关键词
沉淀硬化
ε-Cu
微观组织
时效处理
precipitatation-hardening
ε -Cu
microstructure
aging treatment
