Aging behavior of Cu and its effect on properties of 0Cr14Ni5Mo2Cu2Nb steel

作者：Niu Jing^*; Dong Junming; Zhang Jianxun; Xue Jin

来源：Rare Metal Materials and Engineering, 2006, 35(S2): 409-412.

• precipitatation-hardening
• epsilon-Cu
• microstructure
• aging treatment

TEM microstructure, hardness and instrumented impact toughness of precipitation-hardening stainless steel 0Cr14Ni5Mo2 Cu2Nb aged at different temperatures were investigated. The results show that the most precipitate of 0Cr14Ni5Mo2Cu2Nb steel is copper-rich phase epsilon-Cu. After 0Cr14Ni5Mo2Cu2Nb was aged at 420 degrees C, 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 0Cr14Ni5Mo2Cu2Nb gradually decreased but its toughness gradually increased and fracture appearance of impact specimens transited to the form of dimple, due to the epsilon-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.

• 出版日期2006-8
• 单位西安交通大学