Effect of Cu on the Microstructure and Mechanical Properties of a Low-Carbon Martensitic Stainless Steel

doi:10.3390/ma15248849

IMR OpenIR

	Effect of Cu on the Microstructure and Mechanical Properties of a Low-Carbon Martensitic Stainless Steel
	Ma, Jun 1,2; Song, Yuanyuan 1; Jiang, Haichang 1; Rong, Lijian 1
通讯作者	Song, Yuanyuan(songyuanyuan@imr.ac.cn)
	2022-12-01
发表期刊	MATERIALS
卷号	15 期号:24 页码:15
摘要	Reversed austenite is of vital importance in low-carbon martensitic stainless steel because it improves impact toughness. However, a proper amount of reversed austenite is obtained by tempering at a critical temperature, which reduces the strength of the steel. Therefore, how to improve strength-toughness matching is an important problem. Copper (Cu) is an effective strengthening element in steels. However, there is little in-depth discussion on the role of Cu on the microstructure and mechanical properties of low-carbon martensite steel. In this work, the effect of different Cu content on the reversed austenite formation, tensile strength, and impact toughness of a low-carbon martensitic stainless steel (0Cr13Ni4Mo) was systematically investigated through use of a transmission electron microscope (TEM), transmission Kikuchi diffraction (TKD), atom probe tomography (APT), and other characterization methods and mechanical property tests. The results showed that the addition of Cu decreased the phase transition temperatures of martensite and austenite and increased the volume fraction of the reversed austenite. APT results indicated that Cu-rich clusters first formed with alloying elements such as ferrum (Fe) and nickel (Ni) and then grew to be precipitates through rejection of the alloying elements. The Ni atoms diffused towards the interface between the precipitates and the martensite matrix, which provided heterogeneous nucleation sites for the reversed austenite. Cu precipitations strengthened tensile strength during tempering. However, it generated temper brittleness in the steel at a tempering temperature of 450 degrees C, resulting in the impact energy of the 3Cu-steel being only 7 J. A good combination with higher tensile strength (863 MPa) and ductility (192 J) was obtained when tempering at 600 degrees C in the presence of Cu-rich precipitates and a sufficient volume fraction of the reversed austenite. The results provide guidance for the design of steels with reversed austenite and Cu and promote the development of high-strength and high-toughness steels.
关键词	low carbon martensitic stainless steel reversed austenite Cu-rich precipitates mechanical properties
DOI	10.3390/ma15248849
收录类别	SCI
语种	英语
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering ; Physics
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Physics, Applied ; Physics, Condensed Matter
WOS记录号	WOS:000903553500001
出版者	MDPI
引用统计	被引频次：10[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/175907
专题	中国科学院金属研究所
通讯作者	Song, Yuanyuan
作者单位	1.Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Ma, Jun,Song, Yuanyuan,Jiang, Haichang,et al. Effect of Cu on the Microstructure and Mechanical Properties of a Low-Carbon Martensitic Stainless Steel[J]. MATERIALS,2022,15(24):15.
APA	Ma, Jun,Song, Yuanyuan,Jiang, Haichang,&Rong, Lijian.(2022).Effect of Cu on the Microstructure and Mechanical Properties of a Low-Carbon Martensitic Stainless Steel.MATERIALS,15(24),15.
MLA	Ma, Jun,et al."Effect of Cu on the Microstructure and Mechanical Properties of a Low-Carbon Martensitic Stainless Steel".MATERIALS 15.24(2022):15.