린 듀플렉스 329LA강의 기계적 변형 거동에 관한 연구

• Published in: 대한금속·재료학회지, 53(9) Vol. 53; no. 9; pp. 608 - 617
• Main Authors: 윤병준, Byung Jun Yoon, 최점용, Jeom Yong Choi, 박경태, Kyung Tae Park, 이호성, Ho Seong Lee
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 05.09.2015; 대한금속·재료학회
• Subjects: deformation; EBSD; electron backscattering diffraction; mechanical properties; metals; phase transformation; stainless steel; stress-strain; 재료공학
• ISSN: 1738-8228; 2288-8241
• DOI: 10.3365/KJMM.2015.53.9.608

The tensile response of Lean Duplex 329LA stainless steel was investigated over various strain rates. It was observed that the mechanical response, including in particular the total elongation of the tested alloy, was strongly affected by the strain rate. As the strain rate decreased from 10-1 s-1 to 10-4 s-1, the elongation increased. As the strain rate increased, the deformation mode in an austenite phase was dominated by dislocation glide, resulting in deterioration of the elongation. The substructure of the ferritic phase showed a dislocation cell structure, independent of the applied strain rate. The optimum mechanical properties of lean duplex stainless steel thus can be obtained by controlling the deformation mode in the austenitic phase.