Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Thermo-mechanical Treatment on the Tensile Properties of Fe-20Mn-12Cr-3Ni-3Si Damping Alloy

Fe-20Mn-12Cr-3Ni-3Si 합금의 인장성질에 미치는 가공열처리의 영향

  • Han, H.S. (Dep. of Automatic Facilities, Korea Polytechnics College Daegu Campus) ;
  • Kang, C.Y. (Dept. of Metallurgical Engineering, Pukyong National University)
  • 한현성 (한국폴리텍대학 대구캠퍼스 산업설비학과) ;
  • 강창룡 (부경대학교 금속공학과)
  • Received : 2019.01.17
  • Accepted : 2019.02.22
  • Published : 2019.03.31
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Abstract

This study was carried out to investigate the effect of thermo-mechanical treatment on the tensile properties of Fe-20Mn-12Cr-3Ni-3Si alloy with deformation induced martensite transformation. ${\alpha}^{\prime}$ and ${\varepsilon}$-martensite, dislocation, stacking fault were formed, and grain size was refined by thermo-mechanical treatment. With the increasing cycle number of thermo-mechanical treatment, volume fraction of ${\varepsilon}$ and ${\alpha}^{\prime}$-martensite, dislocation, stacking fault were increased, and grain size decreased. In 5-cycle number thermo-mechanical treated specimens, more than 10% of the volume fraction of ${\varepsilon}$-martensite and less than 3% of the volume fraction of ${\alpha}^{\prime}$-martensite were attained. Tensile strength was increased and elongation was decreased with the increasing cycle number of thermo-mechanical treatment. Tensile properties of thermo-mechanical treated alloy with deformation induced martensite transformation was affected to formation of martensite by thermo-mechanical treatment, but was large affected to increasing of dislocation and grain refining.

Keywords

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Fig. 1. Optical micrograph of Fe-20Mn-12Cr-3Ni-3Si alloy.

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Fig. 2. TEM micrographs of 18% cold rolled Fe-20Mn-12Cr-3Ni-3Si alloy. a) Bright field, b) SADP and indexing of SADP.

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Fig. 3. TEM micrographs of reversed austenite in 18% cold rolled Fe-20Mn-12Cr-3Ni-3Si alloy, after annealing at 700°C for 20 min. a) Bright field, b) SADP and indexing of SADP.

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Fig. 4. TEM micrographs of showing the effect of the thermo-mechanical treatment in Fe-20Mn-12Cr-3Ni-3Si alloy. a) 1Cycle, b) 3 Cycle.

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Fig. 5. Phase map showing the effect of cycle number of the thermo - mechanical treatment on the martensite formation in Fe-20Mn-12Cr-3Ni-3Si alloy. a) 1 Cycle, b) 5 Cycle.

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Fig. 6. Effect of cycle number of the thermo-mechanical treatment on the volume fraction of each phase in Fe-20Mn-12Cr-3Ni-3Si alloy.

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Fig. 7. Effect of cycle number of thermo-mechanical treatment on the grain size of Fe-20Mn-12Cr-3Ni-3Si alloy.

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Fig. 8. Effect of cycle number of the thermo-mechanical treatment on tensile properties of Fe-20Mn-12Cr-3Ni-3Si alloy.

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Fig. 9. Effect of volume fraction of ε-martensite on thetensile properties of thermo-mechanical treated Fe-20Mn-12Cr-3Ni-3Si alloy.

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Fig. 10. Effect of volume fraction of martensite on the tensile properties of thermo-mechanical treated Fe-20Mn-12Cr-3Ni-3Si alloy.

Table 1. Chemical composition of specimen (wt.%)

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