Shim Hyunbo, Kang Changyong
Heavy Plate R&D Team, Hyundai Steel, Dangjin 31719, Korea.
Department of Metallurgical Engineering, Pukyong National University, Busan 5991, Korea.
Materials (Basel). 2019 Apr 4;12(7):1119. doi: 10.3390/ma12071119.
This study was carried out to investigate the effect of thermo-mechanical treatment on the microstructure of Fe-20Mn-12Cr-3Ni-3Si damping alloy. Dislocation, α', and ε-martensite were formed by thermo-mechanical treatment. The intersections of the surface relief and specific direction due to martensitic transformation were generated by thermo-mechanical treatment. They were then reversed to austenite with an ultra-fine grain size of less than 5 μm by annealing treatment at 700°C for 20min. The volume fractions of dislocation, α', and ε-martensite were increased with the cycle number of thermo-mechanical treatment. In five-cycle number thermo-mechanical treated specimens, more than 45% of the volume fraction of ε-martensite and less than 3% of the volume fraction of α΄-martensite were attained. Therefore, in this article, the effect of thermo-mechanical treatment is briefly introduced, and these phenomena are explained in terms of the grain refinement of austenite, α', and ε-martensite distribution and homogeneous dislocation distribution.
本研究旨在探究热机械处理对Fe-20Mn-12Cr-3Ni-3Si阻尼合金微观结构的影响。热机械处理形成了位错、α'和ε-马氏体。热机械处理产生了由于马氏体相变导致的表面起伏与特定方向的相交处。然后通过在700°C下退火20分钟将它们转变为晶粒尺寸小于5μm的超细奥氏体。位错、α'和ε-马氏体的体积分数随着热机械处理的循环次数增加。在经过五循环热机械处理的试样中，ε-马氏体的体积分数达到45%以上，α΄-马氏体的体积分数小于3%。因此，本文简要介绍了热机械处理的效果，并从奥氏体晶粒细化、α'和ε-马氏体分布以及均匀位错分布的角度对这些现象进行了解释。
