Effect of post-processing on microstructure and mechanical properties of selective laser melting K536 alloy

doi:10.13251/j.issn.0254-6051.2021.01.033

Abstract

Abstract: K536 alloy was formed by selective laser melting then post-processed.The microstructure and mechanical properties of the alloy were analyzed in as-deposited,as-annealed,and as-annealed+solid solution treated,as-annealed+solid solution treated+hot isostatic pressed,respectively.The results show that microcracks form in the transversal and longitudinal sections of the as-deposited specimens.For the as-annealed specimens,the transversal section microstructure is composed of equiaxed grains and the longitudinal one is of columnar grains,and the grain size fluctuates greatly,forming alternating fine and coarse-grained areas.Partial recrystallization occurs in the as-annealed+solid solution treated specimens,with twin crystals being observed in the recrystallized part.In addition,there are obvious equiaxed grain structure,uneven grain size,and grain boundary precipitates with long strip shape.After the hot isostatic pressing,the grain size of specimens increases obviously,the deposition generated cracks are basically healed,and the high-temperature durability index meets the requirements of related ASTM standard.The transgranular carbides are evenly distributed,and the carbides at the grain boundary are in chains.

Key words: K536 alloy, selective laser melting, post-processing, microstructure, mechanical properties

CLC Number:

TG174.4

Wang Dong, Su Mengyao, Mo Zhanhai, Xu Xingxing, Zhou Xiaowei, Xie Xiaolin. Effect of post-processing on microstructure and mechanical properties of selective laser melting K536 alloy[J]. Heat Treatment of Metals, 2021, 46(1): 181-186.

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