时效温度对Cu沉淀强化超高强海工钢力学性能的影响

doi:10.11896/cldb.18120131

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Abstract Effect of aging temperature on copper-precipitation behavior and mechanical properties of low carbon ultra-high strength marine engineering steel was investigated by means of Thermo-Calc software, SEM and HRTEM. The results showed that aging hardness of Ni-Cr-Mo-Cu steel was significantly higher than Ni-Cr-Mo steel between 400 ℃ and 550 ℃ aging, and the highest aging peak hardness was 386HV. Cu particles exhibited a lower coarsening rate at 525 ℃ aging, the average precipitation radius of Cu particles was 5.2 nm, and the Cu precipitates yielded shear strengthening mechanism with a strength increment of 100 MPa. When aging temperature was 550 ℃ to 575 ℃, the strengthening mechanism transformed into by-pass because of the coarsening of Cu particles, as a result, the strength increment was less than 50 MPa. The Ni-Cr-Mo-Cu steel could achieve better match of strength and toughness at 525 ℃ aging, the yield strength reached 1 120 MPa and the -80 ℃ low-temperature V-notch impact energy was 76 J, which was 9% and 15% higher than the value obtained in Ni-Cr-Mo steel.

Key words： aging temperature ultra-high strength steel low carbon Cu precipitation strengthening roughening rate

Published: 12 March 2020

CLC number:

TG314

Fund:This work was financially supported by National Key R&D Program of China (2017YFB0703002).

About author:: Zhentuan Lireceived his M.D. degree in Materials Science and Engineering from Inner Mongolia University of Science and Technology in 2015. He is currently pursuing her doctor's degree in the Central Iron and Steel Research Institute (CISRI) under the supervision of Prof. Feng Chai. His research focused on the nanoparticles precipitation behavior and performance control of ultra-high strength marine Steel, and he has published five journal papers; Feng Chaiobtained her D.E. degree from the Shanghai Jiaotong University in 2008, he is currently a professor of engineer and master supervisor. His research mainly focused on development of high-performance marine steel products. He has published more than 50 journal papers, attained the authorization of ten patents and participated in writing two monographs.

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	LI Zhentuan
	CHAI Feng
	LUO Xiaobing
	ZHANG Zhengyan
	YANG Caifu
	SU Hang

Cite this article:

LI Zhentuan,CHAI Feng,LUO Xiaobing, et al. Effect of Aging Temperature on Mechanical Properties of Ultra High Strength Marine Engineering Steel Strengthened by Cu Precipitation[J]. Materials Reports, 2020, 34(6): 6132-6137.

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http://www.mater-rep.com/EN/10.11896/cldb.18120131 OR http://www.mater-rep.com/EN/Y2020/V34/I6/6132

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