电弧增材制造HSLA钢的组织演变行为与力学性能

doi:10.13228/j.boyuan.issn0449-749x.20210183

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Abstract Wire arc additive manufacturing (WAAM) is a novel and important method for forming high-performance HSLA steel components. In order to reveal the microstructural evolution behavior of HSLA steel during WAAM,the temperature field,thermal cycle,heat affected zone partition and its microstructure transformation of component during deposition were investigated. The results showed that in WAAM process,the deposited metal of HSLA steel consisted of solidification zone (SZ) and heat affected zone,and the latter could be divided into coarse austenitic-grain zone (CAZ),normalizing zone (NZ) and tempering zone (TZ). Under the action of thermal cycle,SZ successively turned into CAZ,NZ,and finally became TZ. Meanwhile,Residual ferrite nuclei,high-density dislocations near inclusions,ferrite sympathetic nucleation,grain boundaries pinning by second-phase particles,and continuous dynamic recrystallization all facilitated the microstructure refinement,making coarse columnar grains,grain boundary ferrites,ferrite slide plates,a small amount of acicular ferrites and pearlites evolved into fine equiaxed ferrites and pearlites,beneficial for improving strength,toughness and inhibiting mechanical anisotropy. The vertical,horizontal tensile strength of WAAMed component were 519.6,520.8 MPa respectively,and impact energy at -20 ℃ was 124.7,122.1 J respectively.

Key words： HSLA steel wire arc additive manufacturing temperature field thermal cycle microstructural evolution grain refinement mechanical property

Received: 06 April 2021

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	YU Run-zhen
	YU Sheng-fu
	QI Bin
	DAI Yi-li

Cite this article:

YU Run-zhen,YU Sheng-fu,QI Bin等. Microstructural evolution behavior and mechanical property of HSLA steel by wire arc additive manufacturing[J]. Iron and Steel, 2021, 56(10): 136-145.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210183 OR http://www.chinamet.cn/Jweb_gt/EN/Y2021/V56/I10/136

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