Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403

공학

한국표면공학회지 (50권5호 380-385)

Effect of High Temperature Aging Time on Mechanical Characteristics Degradation of STS 304 Steel

STS 304 강의 기계적 특성에 미치는 고온 열화 시간의 영향

정광후;김성종;
Jung, Kwang-Hu;Kim, Seong-Jong;

목포해양대학교 기관시스템공학부;
Division of Marine Engineering, Mokpo National Maritime University;

DOI : 10.5695/JKISE.2017.50.5.380

Abstract

Mechanical characteristics of the STS 304 which is heat resistance steel were investigated after artificial aging at $650^{circ}C$ with 1,000 hours. Tensile test specimens and small test pieces were done artificial aging up to 1,000 hours in the high temperature atmospheric environment. The results present that as the aging time increased, tensile properties were deteriorated. In the case of failure mechanism, the configuration of the fractography presented drastic change from ductile to brittle with aging time. $M_{23}C_6$ carbide leading to the change of the mechanical properties and fracture mode of the aged STS 304 steel continuously precipitated along the grain boundaries of austenite microstructure.

Keywords

STS 304;Artificial aging;Mechanical property;Degradation;$M_{23}C_6$ carbide;