Experimental and Simulation Analysis of Hot Isostatic Pressing of Gas Atomized Stainless Steel 316L Powder Compacts

Lin, Dongguo; Ha, Sangyul; Shin, Youngho; Park, Dong Yong; Park, Seong Jin; Chung, Sung Taek; Bollina, Ravi; See, Seongkyu

doi:2016.54.10.732

Korean Journal of Metals and Materials > Volume 54(10); 2016 > Article

Research Paper

Korean Journal of Metals and Materials 2016;54(10): 732-742. doi: https://doi.org/10.3365/KJMM.2016.54.10.732

Experimental and Simulation Analysis of Hot Isostatic Pressing of Gas Atomized Stainless Steel 316L Powder Compacts

Dongguo Lin¹, Sangyul Ha², Youngho Shin³, Dong Yong Park⁴, Seong Jin Park¹, Sung Taek Chung⁵, Ravi Bollina⁶, Seongkyu See⁷

¹Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
²Corporate R&D Institute, Samsung Electro-Mechanics, Suwon 16674, Republic of Korea
³Doosan Heavy Industries & Construction Co., Ltd., Changwon 51711, Republic of Korea
⁴Department of Solar Thermal, Korea Institute of Energy Research, Daejeon 34129, Republic of Korea
⁵CetaTech Inc., Sacheon 52537, Republic of Korea
⁶Mahindra Ecole Centrale, Bahadurpally Jeedimetla, Hyderabad 500043, India
⁷POSCO, Pohang 37859, Republic of Korea

Correspondence

Sangyul Ha ,Tel: +82-31-300-4732, Email: dubuking@postech.ac.kr

Received: 11 April 2016; Accepted: 10 May 2016. Published online: 5 October 2016.

ABSTRACT

In this work, both experimental and numerical studies were conducted to investigate the densification behavior of stainless steel 316L (STS 316L) powders during hot isostatic pressing (HIP), and to characterize the mechanical properties of HIPed specimens. The HIP experiments were conducted with gas atomized STS 316L powders with spherical particle shapes under controlled pressure and temperature conditions. The mechanical properties of HIPed samples were determined based on a series of tensile tests, and the results were compared to a reference STS 316L sample prepared by the conventional process, i.e., extrusion and annealing process. Corresponding microstructures before and after tensile tests were observed using scanning electron microscopy and their relationships to the mechanical properties were addressed. Furthermore, a finite element simulation based on the power-law creep model was carried out to predict the density distribution and overall shape change of the STS316L powder compact during HIP process, which agreed well with the experimental results.

Keywords: metals, hot isostatic pressing (HIP), densification, mechanical properties, computer simulation