Cu Partitioning Behavior and Its Effect on Microstructure and Mechanical Properties of 0.12C-1.33Mn-0.55Cu Q&P Steel

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	Cu Partitioning Behavior and Its Effect on Microstructure and Mechanical Properties of 0.12C-1.33Mn-0.55Cu Q&P Steel
	Chen Liansheng; Hu Baojia; Xu Jinghui; Tian Yaqiang; Zheng Xiaoping; Song Jinying; Xu Yong; Tian, YQ (reprint author), North China Univ Sci & Technol, Hebei Key Lab Modern Met Technol, Tangshan 063009, Peoples R China.
刊名	JOURNAL WUHAN UNIV TECHNOLOGY
	2017-10-01
卷号	32 期号:5 页码:1179-1185
关键词	Low Carbon High Strength Steel Intercritical Annealing Element Partitioning Behavior Retained Austenite Mechanical Properties
ISSN号	1000-2413
英文摘要	Cu, as an austenitic stable element, is added to steel in order to suppress the adverse effects of high content of C and Mn on welding. Based on C partitioning, Cu and Mn partitioning can further improve the stability of retained austenite in the intercritical annealing process. A sample of low carbon steel containing Cu was treated by the intercritical annealing, then quenching process (I&Q). Subsequently, another sample was treated by the intercritical annealing, subsequent austenitizing, then quenching and partitioning process (I&Q&P). The effects of element partitioning behavior in intercritical region on the microstructure and mechanical properties of the steel were studied. The results showed that after the I&Q process ferrite and martensite could be obtained, with C, Cu and Mn enriched in the martensite. When intercritically heated at 800 degrees C, Cu and Mn were partitioned from ferrite to austenite, which was enhanced gradually as the heating time was increased. This partitioning effect was the most obvious when the sample was heated at 800 degrees C for 40 min. At the early stage of alpha -> gamma transformation, the formation of. was controlled by the partitioning of carbon, while at the later stage, it was mainly affected by the partitioning of Cu and Mn. After the I&Q&P process, the partitioning effect of Cu and Mn element could be retained. C was assembled in retained austenite during the quenching and partitioning process. The strength and elongation of I&Q&P steel was increased by 5 305 MPa% compared with that subjected to Q&P process. The volume fraction of retained autensite was increased from 8.5% to 11.2%. Hence, the content of retained austenite could be improved significantly by Mn and Cu partitioning, which increased the elongation of steel.; Cu, as an austenitic stable element, is added to steel in order to suppress the adverse effects of high content of C and Mn on welding. Based on C partitioning, Cu and Mn partitioning can further improve the stability of retained austenite in the intercritical annealing process. A sample of low carbon steel containing Cu was treated by the intercritical annealing, then quenching process (I&Q). Subsequently, another sample was treated by the intercritical annealing, subsequent austenitizing, then quenching and partitioning process (I&Q&P). The effects of element partitioning behavior in intercritical region on the microstructure and mechanical properties of the steel were studied. The results showed that after the I&Q process ferrite and martensite could be obtained, with C, Cu and Mn enriched in the martensite. When intercritically heated at 800 degrees C, Cu and Mn were partitioned from ferrite to austenite, which was enhanced gradually as the heating time was increased. This partitioning effect was the most obvious when the sample was heated at 800 degrees C for 40 min. At the early stage of alpha -> gamma transformation, the formation of. was controlled by the partitioning of carbon, while at the later stage, it was mainly affected by the partitioning of Cu and Mn. After the I&Q&P process, the partitioning effect of Cu and Mn element could be retained. C was assembled in retained austenite during the quenching and partitioning process. The strength and elongation of I&Q&P steel was increased by 5 305 MPa% compared with that subjected to Q&P process. The volume fraction of retained autensite was increased from 8.5% to 11.2%. Hence, the content of retained austenite could be improved significantly by Mn and Cu partitioning, which increased the elongation of steel.
学科主题	Materials Science, Multidisciplinary
语种	英语
资助机构	National Natural Science Foundation of China [51574107, 51304186]; Natural Science Foundation of Hebei Province [E2016209048, E2017209048]; Tangshan High Performance Metal and Composite Materials Science and Technical Innovation Team [15130202C]
公开日期	2018-01-10
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79070]
专题	金属研究所_中国科学院金属研究所
通讯作者	Tian, YQ (reprint author), North China Univ Sci & Technol, Hebei Key Lab Modern Met Technol, Tangshan 063009, Peoples R China.
推荐引用方式 GB/T 7714	Chen Liansheng,Hu Baojia,Xu Jinghui,et al. Cu Partitioning Behavior and Its Effect on Microstructure and Mechanical Properties of 0.12C-1.33Mn-0.55Cu Q&P Steel[J]. JOURNAL WUHAN UNIV TECHNOLOGY,2017,32(5):1179-1185.
APA	Chen Liansheng.,Hu Baojia.,Xu Jinghui.,Tian Yaqiang.,Zheng Xiaoping.,...&Tian, YQ .(2017).Cu Partitioning Behavior and Its Effect on Microstructure and Mechanical Properties of 0.12C-1.33Mn-0.55Cu Q&P Steel.JOURNAL WUHAN UNIV TECHNOLOGY,32(5),1179-1185.
MLA	Chen Liansheng,et al."Cu Partitioning Behavior and Its Effect on Microstructure and Mechanical Properties of 0.12C-1.33Mn-0.55Cu Q&P Steel".JOURNAL WUHAN UNIV TECHNOLOGY 32.5(2017):1179-1185.