Laser powder bed fusion of 17-4 PH stainless steel: A comparative study on the effect of heat treatment on the microstructure evolution and mechanical properties

doi:10.1016/j.addma.2021.102176

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	Laser powder bed fusion of 17-4 PH stainless steel: A comparative study on the effect of heat treatment on the microstructure evolution and mechanical properties
	Sabooni, S.1; Chabok, A.1; Feng, S. C.1,5; Blaauw, H.2; Pijper, T. C.2,3; Yang, H. J.4; Pei, Y. T.1
刊名	ADDITIVE MANUFACTURING
	2021-10-01
卷号	46 页码:10
关键词	Laser powder bed fusion 17-4 PH stainless steel Post-process heat treatment Age hardening Reverted austenite
ISSN号	2214-8604
DOI	10.1016/j.addma.2021.102176
通讯作者	Pei, Y. T.(y.pei@rug.nl)
英文摘要	17-4 PH (precipitation hardening) stainless steel is commonly used for the fabrication of complicated molds with conformal cooling channels using laser powder bed fusion process (L-PBF). However, their microstructure in the as-printed condition varies notably with the chemical composition of the feedstock powder, resulting in different age-hardening behavior. In the present investigation, 17-4 PH stainless steel components were fabricated by LPBF from two different feedstock powders, and subsequently subjected to different combinations of post-process heat treatments. It was observed that the microstructure in as-printed conditions could be almost fully martensitic or ferritic, depending on the ratio of Creq/Nieq of the feedstock powder. Aging treatment at 480 degrees C improved the yield and ultimate tensile strengths of the as-printed components. However, specimens with martensitic structures exhibited accelerated age-hardening response compared with the ferritic specimens due to the higher lattice distortion and dislocation accumulation, resulting in the "dislocation pipe diffusion mechanism". It was also found that the martensitic structures were highly susceptible to the formation of reverted austenite during direct aging treatment, where 19.5% of austenite phase appeared in the microstructure after 15 h of direct aging. Higher fractions of reverted austenite activates the transformation induced plasticity and improves the ductility of heat treated specimens. The results of the present study can be used to tailor the microstructure of the L-PBF printed 17-4 PH stainless steel by post-process heat treatments to achieve a good combination of mechanical properties.
资助项目	Materials innovation institute M2i[15808/S16044] ; Technology Foundation STW ; Beijing Natural Science Foundation[3214049] ; Fundamental Research Funds for the Central Universities, China[QNXM20210026]
WOS研究方向	Engineering ; Materials Science
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000696995300003
资助机构	Materials innovation institute M2i ; Technology Foundation STW ; Beijing Natural Science Foundation ; Fundamental Research Funds for the Central Universities, China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/166957]
专题	金属研究所_中国科学院金属研究所
通讯作者	Pei, Y. T.
作者单位	1.Univ Groningen, Engn & Technol Inst Groningen, Dept Adv Prod Engn, Nijenborgh 4, NL-9747 AG Groningen, Netherlands 2.Philips Personal Care, Oliemolenstr 5, NL-9203 ZN Drachten, Netherlands 3.Innovat Cluster Drachten, Nipkowlaan 5, NL-9207 JA Drachten, Netherlands 4.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China 5.Univ Sci & Technol Beijing, Sch Mech Engn, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Sabooni, S.,Chabok, A.,Feng, S. C.,et al. Laser powder bed fusion of 17-4 PH stainless steel: A comparative study on the effect of heat treatment on the microstructure evolution and mechanical properties[J]. ADDITIVE MANUFACTURING,2021,46:10.
APA	Sabooni, S..,Chabok, A..,Feng, S. C..,Blaauw, H..,Pijper, T. C..,...&Pei, Y. T..(2021).Laser powder bed fusion of 17-4 PH stainless steel: A comparative study on the effect of heat treatment on the microstructure evolution and mechanical properties.ADDITIVE MANUFACTURING,46,10.
MLA	Sabooni, S.,et al."Laser powder bed fusion of 17-4 PH stainless steel: A comparative study on the effect of heat treatment on the microstructure evolution and mechanical properties".ADDITIVE MANUFACTURING 46(2021):10.