Effect of Interaction Between Dislocation and Nitrides on High Temperature Deformation Behavior of12%Cr-15%Mn Austenitic Steels

J. Ocean Eng. Technol. 2001;15(3):58-62.

전위와 질화물의 상호작용이 12%Cr-15%Mn 오스테나이트강의 고온변형거동에 미치는 영향

배동수

동의대학교 신소재공학과

Keywords: Fusion reactor, High Mn austenitic steel, radio-activation, Nitride precipitate, Creep deformation, Internal stress, Precipitates and dislocations

핵심용어: 핵융합로, 고Mn 오스테나이트강, 방사능화, 질화물, 크리프 변형, 내부응력, 전위와 석출물

Abstract

The objective of research is to clarify the interaction between dislocations and precipitates during high temperature creep deformation behaviors of high n austenitic steels. After measuring the internal stress in minimum creep rate state under applied stress of 236MPa at 873K, a transmission electron microscope (TEM) observation was performed to investigate the interaction between dislocations and precipitates during high temperature creep deformation. The band widths and values of internal stress increased when the nitride precipitates distribute more densely. Fine nitrides disturbed the dislocation movement with pinning the dislocations and perfect dislocations were separated into Shockley partial dislocations by fine nitrides. Coarse nitrides disturbed the dislocation movement with climb mechanism.