Selective laser melting 공정으로 제조된 AISI 316L 합금의 상온 및 고온 압축 변형 거동 = Room and Elevated Temperature Compressive Deformation Behavior of AISI 316L Alloy Fabricated by Selective Laser Melting Process

다국어 초록 (Multilingual Abstract)

This study investigated the microstructure and compressive properties (at room & high temperatures) of Fe-Cr-Ni based AISI 316L alloy, manufactured by selective laser melting process. The effect of stress relieving heat treatment on the microstructure and mechanical properties also examined. Regardless of the stress relieving heat treatment, the SLMed AISI 316L alloy exhibited typical molten pools and fine columnar structures which grew along the laser heat source. A cellular type dendrite structure was also observed inside the molten pool. After heat treatment, the low angle boundary fraction decreased and the high angle boundary fraction increased in the SLMed AISI 316L alloy. In the 25 oC, 500 oC, 700 oC, 900 oC compressive results, the heat treated 316L alloy showed lower yield strengths than the as fabricated alloy at all temperature conditions.
However, the difference in yield strength between the as fabricated and heat treated alloys gradually decreased with increasing temperature. Surface and cross-sectional fractographies showed that the heat treated alloy accommodated more plastic deformation. This was considered the cause of the more pronounced work hardening of the heat treated alloy, as identified in the stress versus strain curves. The correlations between microstructure, temperature dependent mechanical properties and stress relieving heat treatment were also discussed based on these findings.

참고문헌 (Reference)

1 A. K. Gupta, 45 : 616-, 2013

2 J. Y. Huang, 47 : 409-, 2006

3 V. Karthik, 99 : 35-, 2016

4 S. K. Samanta, 430 : 242-, 2006

5 T. Hryniewicz, 202 : 1668-, 2008

6 E. Paffumi, 85 : 798-, 2008

7 J. P. Kruth, 149 : 616-, 2004

8 L. Thijs, 58 : 3303-, 2010

9 B. Vandenbroucke, 13 : 196-, 2007

10 D. Herzog, 117 : 371-, 2016

11 I. Tolosa, 51 : 639-, 2010

12 R. Li, 256 : 4350-, 2010

13 B. Zhang, 584 : 21-, 2013

14 I. Yadroitsev, 213 : 606-, 2013

15 M. Sergio, 55 : 526-, 2014

16 W. Shifeng, 214 : 2660-, 2014

17 B. Song, 43 : 727-, 2014

18 P. Mercelis, 12 : 254-, 2006

19 A. Riemer, 120 : 15-, 2014

20 L. Liu, 21 : 354-, 2018

21 W. A. Poling, Colorado school of Mines 2012

22 X. Y. Wang, 255 : 836-, 2003

23 Z. N. Li, "Enhanced Mechanical Properties of 316L Stainless Steel Prepared by Aluminothermic Reaction Subjected to Multiple Warm Rolling" 대한금속·재료학회 24 (24): 633-643, 2018

24 김종식, "316L 스테인리스강에서 마르텐사이트 생성거동에 미치는 가공열처리의 영향" 대한금속·재료학회 56 (56): 265-271, 2018