Ni对高强度低合金钢中富Cu相析出特征的影响

doi:10.11896/cldb.21070210

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Abstract In this work, the influence of Ni (wt%)contents on the microstructure, mechanical properties and Cu-rich precipitates (CRPs) of high-strength low alloy (HSLA) steels (1.5 Ni and 2.0 Ni), which were subjected to water quenching at 900 ℃ and aging process at 630 ℃ for 2 h, were studied by optical microscopy (OM), high-resolution electron microscopy (HRTEM) and atom probe tomography (APT). The results indicate that the strength and impact absorption energy (-60 ℃) of 2.0 Ni steel are higher than those of 1.5 Ni steel. The microstructure of two steels has no obvious change as Ni content increases, which is mainly constituted of lath and granular bainite. In 1.5 Ni steel, CRPs with twinned fcc structure are mostly ellipsoid, and the average radius and number density are around 3.5 nm and 1.5×10²² m^-3, respectively. By comparison, in 2.0 Ni steel, CRPs with 9R structure are mostly spherical, and the average radius and number density are about 2.9 nm and 2.9×10²² m^-3, respectively. With Ni content increasing, the critical nucleation energy of CRPs decreased and number density increased. Meanwhile, Ni and Mn atoms more likely segregate at the CRPs/matrix interfaces in 2.0 Ni steel, which can effectively decline the interfacial energy. Thus, CRPs is relatively stable and difficult to grow up and coarsen. As a result, the size of CRPs in 2.0 Ni steel was relatively small, but the number density was higher, corresponding to higher precipitation strengthening effects.

Key words： high-strength low alloy steel Ni Cu-rich precipitates atom probe tomography element distribution

Published: Online: 2022-06-09

CLC number:

TG142.71

Fund:National Key Research and Development Program of China (2017YFB0304501) and Shanghai Sailing Program (19YF1446600).

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	Articles by authors
	CHAI Feng
	WANG Zemin
	LUO Xiaobin
	ZHANG Zhengyan
	LIU Min
	WANG Zhanyong

Cite this article:

CHAI Feng,WANG Zemin,LUO Xiaobin, et al. Effect of Ni on the Features of Cu-rich Precipitates in High-strength Low Alloy Steel[J]. Materials Reports, 2022, 36(11): 21070210-5.

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http://www.mater-rep.com/EN/10.11896/cldb.21070210 OR http://www.mater-rep.com/EN/Y2022/V36/I11/21070210

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