Improvement of strength-ductility balance by copper addition in 9%Ni steels
Improvement of strength-ductility balance by copper addition in 9%Ni steels
复制标题
DOI：
10.1016/j.msea.2004.01.048
复制
发表时间：
2004-06
期刊：
影响因子：
6.4
通讯作者：
Nobuo Nakada;J. Syarif;T. Tsuchiyama;S. Takaki
中科院分区：
文献类型：
--
作者：
Nobuo Nakada;J. Syarif;T. Tsuchiyama;S. Takaki
通过拉伸试验研究了Cu对低温9%Ni钢力学性能的影响，并结合显微组织特征讨论了含Cu 9%Ni钢的强韧性平衡问题。回火时，铜颗粒在马氏体基体中细析出。Cu的加入还增加了沿沿着界形成的反向奥氏体的数量，这是因为Cu被凝聚成反向奥氏体，改变了奥氏体的稳定性。另一方面，Cu的加入提高了9%Ni钢的屈服强度和抗拉强度，这是由于Cu颗粒的沉淀强化作用，而不损失塑性。Cu对均匀延伸率的提高是通过形变诱发反转奥氏体的马氏体相变（TRIP辅助效应）来解释的。结果表明，Cu的加入通过TRIP辅助效应提高了加工硬化速率，抑制了颈缩变形的发生。
Effect of Cu addition on mechanical properties of a cryogenic 9%Ni steel was studied by means of tensile testing, and then strength–ductility balance was discussed in the Cu bearing 9%Ni steel in connection with microstructural characteristics. Cu particles precipitated finely within martensite matrix on tempering. The Cu addition also increased the amount of reversed austenite formed along lath boundaries, because the Cu was condensed into the reversed austenite and changed the stability of austenite. On the other hand, yield strength and tensile strength of 9%Ni steel were increased by Cu addition owing to precipitation strengthening by the Cu particles without losing ductility. The improvement of uniform elongation by Cu addition was explained in terms of deformation-induced martensitic transformation of reversed austenite (TRIP assisted effect). It was concluded that the Cu addition increases the work-hardening rate through the TRIP assisted effect and suppresses the occurrence of necking deformation.