Strengthening effect of nanoscale precipitation and transformation induced plasticity in a hot rolled copper-containing ferrite-based lightweight steel

详细信息    查看全文

• 作者：Junfeng Wang^a ; Zhaoguang Wang^a ; Xiaodong Wang^a ; ^{xdwang77@sjtu.edu.cn} ; Qi Yang^b ; ^c ; ^{yangqi@baosteel.com} ; Xuejun Jin^a ; Li Wang^b ; ^c
• 关键词：Ferrite-based lightweight steel ; Bainitic transformation ; Copper precipitation strengthening ; Mechanical property
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：1 March 2017
• 年：2017
• 卷：129
• 期：Complete
• 页码：25-29
• 全文大小：1170 K
• 卷排序：129

文摘

Effects of copper addition on microstructure and tensile property of a hot rolled ferrite-based lightweight steel are investigated. Copper addition delays bainitic transformation, resulting in higher volume fraction of retained austenite with lower stability in the steel. Addition of 1.0 wt% copper increases the yield strength and tensile strength of the steel by 17% and 19%, respectively, and maintains high ductility. The yield strength enhancement is predominantly attributed to nanoscale copper precipitation. The higher work hardening rate due to precipitation hardening and the transformation-induced-plasticity mechanism leads to higher tensile strength (805 MPa) and remarkable elongation-to-failure (~ 30%) for the copper-containing steel.