발간논문

Home > KJMM 논문 > 발간논문

Vol.34, No.9, 1193 ~ 1202, 1996
Title
Research Paper - Mechanical Working - : Load Relaxation Behavior of a Strip - Cast 304 Stainless Steel
이형식Hyong Chig Lee, 신영길Young Kil Shin, 장영원Young Won Chang
Abstract
The deformation mechanism of a strip-cast 304 stainless steel has been investigated by carrying out a series of load relaxation and tensile tests at the temperatures ranging from room temperature to 300℃. The experimental results were then analyzed according to the inelastic constitutive theory proposed recently. A thermomechanical treatment was performed before the test to remove the inhomogeneous cast structures providing comparable mechanical properties to those of conventionally processed 304 stainless steel. The inelastic deformation behavior of this steel is found to consist of two simultaneously occurring parallel processes, viz., viscous drag and long range interaction of dislocations. The total flow stress appears, in this regard, to consist of a friction stress to overcome lattice friction and an internal stress to overcome mutual interaction force of glide dislocations. The hardness parameter and the static friction stress were found to decrease as the temperature increased. The scaling parameter in the inelastic constitutive relation was found to be equal to the inverse of the power exponent(M). The value of M was obtained as M=0.17 at room temperature providing a unique scaling relation of flow curves generated by consecutive load relaxation tests. The activation energy for dislocations to overcome lattice friction was measured as 78.5 kJ/㏖ similar to that of carbon diffusion in iron.
Key Words
| PDF
대한금속∙재료학회 │ (06633) 서울시 서초구 서초대로 56길 38 대한금속∙재료학회 회관 (서초1동 1666-12번지)
Tel : 070-4266-1646 │ FAX : 02-557-1080 │ E-mail : metal@kim.or.kr
Copyright ⓒ 2013 사단법인 대한금속∙재료학회 All rights reserved.