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SCIE SCOPUS
박판연구 304 스테인레스강의 응력이완특성
Research Paper - Mechanical Working - : Load Relaxation Behavior of a Strip - Cast 304 Stainless Steel
이형직(Hyong Chig Lee), 신영길(Young Kil Shin), 장영원(Young Won Chang)
UCI I410-ECN-0102-2009-580-007110497

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 farce 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.

[자료제공 : 네이버학술정보]
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