Microstructure transformation and variant selection of SLM and SLM + HT formed TA17 alloy

FU Chao; LU Lili; YUAN Jun; YE Yihai; HUANG Weidong

doi:10.12073/j.hjxb.20220908003

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2023 > 44(7): 109-115. > DOI: 10.12073/j.hjxb.20220908003

FU Chao, LU Lili, YUAN Jun, YE Yihai, HUANG Weidong. Microstructure transformation and variant selection of SLM and SLM + HT formed TA17 alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(7): 109-115. DOI: 10.12073/j.hjxb.20220908003

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Microstructure transformation and variant selection of SLM and SLM + HT formed TA17 alloy

Nuclear Power Institute of China, Chengdu, 610213, China

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Received Date: September 07, 2022
Available Online: June 14, 2023

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Abstract

Abstract

In order to systematically investigate the microstructure transformation mechanism of selective laser melting(SLM) formed TA17 alloy, the microstructures of TA17 alloy were characterized and analyzed under SLM and SLM + heat treatment(HT). The results show that under extremely fast cooling conditions, the microstructure of TA17 is dominated by fine needle-shape α phase, with plate textures {0 0 0 1} < 1 0 −1 0 >, {1 0 −1 0} < 1 1 −2 0 > and {1 1 −2 0} < 1 0 −1 0 > as main types; and two types of variants, namely the 60°/[1 1 −2 0] and 60.83°/[−1.377 −1 2.377 0.359], are inclined to be generated. While after a treatment of 950 °C/2 h + air cooling, a dual state α structure is formed on the TA17 alloy with typical equiaxed grains and a plate-like morphology. With the increase in the degree of texture dispersion, the strength decreased significantly. There was also a change in variant selection, as the proportion of 60°/[1 1 −2 0] and 60.83°/[−1.377 −1 2.377 0.359] variants decreased significantly, 63.26°/[−10 5 5 −3] become the major variant.
- TA17 alloy,
- selective laser melting,
- microstructure transformation,
- variant selection

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References (21)

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Microstructure transformation and variant selection of SLM and SLM + HT formed TA17 alloy

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