304 오스테나이트계 스테인레스강의 고온변형 거동

High Temperature Deformation Behavior of 304 Stainless Steel

  • 조상현 (인하대학교 금속공학과) ;
  • 김성일 (인하대학교 금속공학과) ;
  • 노광섭 (포항제철 기술연구소) ;
  • 유연철 (인하대학교 금속공학과)
  • 발행 : 1996.10.01

초록

The torsion tests in the range of 900~1100$^{\circ}C$ and 5.0X10-2~5.0X100/sec were performed to study the high temperasture deformation behavior kinetics of 304 stainless steels. The flow curves and microstructures exhibited the characteristic of dynamic recrystallization(DRX). The relationship between the critical strain($\varepsilon$c) for the initiation of dynamic recrystallization and the peak strain($\varepsilon$p) could be expressed as $\varepsilon$c=0.73$\varepsilon$p. The dependence of the flow stress on temperature(T) and stain rate($\varepsilon$) was expressed by hyperbolic sine law, $\varepsilon$=2.75X1014 (sinh 0.076$\sigma$)5.26 exp(-379.55kJ/mol). Under the Zener-Hollomon parameter, Z value of 1013 order, it was found that the grain size was 20${\mu}$m. The relationship between the grain size, dDRX and Z parameter was expressed as dDRX =139.48-7.33 log Z.

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