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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
Corresponding AuthorPei, Y. T.(y.pei@rug.nl)
2021-10-01
Source PublicationADDITIVE MANUFACTURING
ISSN2214-8604
Volume46Pages:10
Abstract17-4 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.
KeywordLaser powder bed fusion 17-4 PH stainless steel Post-process heat treatment Age hardening Reverted austenite
Funding OrganizationMaterials innovation institute M2i ; Technology Foundation STW ; Beijing Natural Science Foundation ; Fundamental Research Funds for the Central Universities, China
DOI10.1016/j.addma.2021.102176
Indexed BySCI
Language英语
Funding ProjectMaterials innovation institute M2i[15808/S16044] ; Technology Foundation STW ; Beijing Natural Science Foundation[3214049] ; Fundamental Research Funds for the Central Universities, China[QNXM20210026]
WOS Research AreaEngineering ; Materials Science
WOS SubjectEngineering, Manufacturing ; Materials Science, Multidisciplinary
WOS IDWOS:000696995300003
PublisherELSEVIER
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/166958
Collection中国科学院金属研究所
Corresponding AuthorPei, Y. T.
Affiliation1.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
Recommended Citation
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.
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