Effects of process parameters on the high temperature strength of 17-4PH stainless steel produced by selective laser mel
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DOI 10.1007/s12206-020-0718-y
Journal of Mechanical Science and Technology 34 (8) 2020 Original Article DOI 10.1007/s12206-020-0718-y Keywords: · Energy density · Laser power · Scan speed · Selective laser melting (SLM) · Small punch test · Strength · 17-4PH
Correspondence to: Jong Min Yu [email protected]
Citation: Lee, H. J., Dao, V. H., Ma, Y. W., Yu, J. M., Yoon, K. B. (2020). Effects of process parameters on the high temperature strength of 17-4PH stainless steel produced by selective laser melting. Journal of Mechanical Science and Technology 34 (8) (2020) ?~?. http://doi.org/10.1007/s12206-020-0718-y
Received March 14th, 2020 Revised
Effects of process parameters on the high temperature strength of 17-4PH stainless steel produced by selective laser melting Ho Jun Lee1, Van Hung Dao1, Young Wha Ma2, Jong Min Yu1 and Kee Bong Yoon1 1
Department of Mechanical Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-Gu, Seoul 2 06974, Korea, R&D Institute, Doosan Heavy Industries & Construction Co., Changwon, Korea
Abstract
In this study, the effects of process parameters on the high temperature strength of 17-4PH stainless steel manufactured by selective laser melting (SLM) were investigated. Nine rectangular block specimens were fabricated with various process parameters. Small punch (SP) tests were conducted at 425 °C four times for each rectangular block specimens. The average maximum SP loads were measured from the tests. The fracture surfaces of SPtested specimens were also examined. Un-melted powder was observed on the fracture surface of the specimen with the lowest average maximum SP load value, which could give rise to local cracking. Analysis of the microstructures showed that the retained austenite and amount of pore defects were the main factors that could affect SP test results. Regression surface methodology (RSM) models was applied to predict the maximum strength as a function of laser scan speed and energy density. Results showed that the energy density level of 64.29 J/mm3 and a scan speed higher than 1884 mm/s are recommended for fabricating SLM parts in the shortest time without losing material strength and with minimum metallurgical defects.
May 6th, 2020
Accepted May 19th, 2020 † Recommended by Editor Chongdu Cho
1. Introduction
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Among various additive manufacturing (AM) technologies, selective laser melting (SLM) has been considered as a suitable technique in rapid prototyping to manufacture fully dense metal parts from pre-alloyed material such as 17-4PH, AlSi12, Ti4Al4V, and AISI 316L stainless steel [1-4]. Wide usage of the SLM is because of many advantages such as low cost, high laser energy density, fewer steps in the production process, and design freedom [5]. Moreover, the products manufactured using SLM showed higher strength, better elongation, and improved corrosion resistance [3, 6-8]. The quality of SLM parts primarily depends on microstructural features. The m
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