Kim Jae-Hwan, Jung Jong-Min, Shim Hyunbo
Fusion Energy Research and Development Directorate, National Institutes for Quantum and Radiological Science and Technology, QST, Aomori 039-3212, Japan.
Department of Industrial Facility Automation, Ulsan Campus of Korea Polytechnic, Ulsan 44482, Korea.
Materials (Basel). 2021 Oct 11;14(20):5975. doi: 10.3390/ma14205975.
The tensile properties and damping capacity of cold-rolled Fe-20Mn-12Cr-3Ni-3Si alloys were investigated. The martensitic transformation was identified, including surface relief with a specific orientation and partial intersection. Besides, as the cold rolling degree increased, the volume fraction of ε-martensite increased, whereas α'-martensite started to form at the cold rolling degree of 15% and slightly increased to 6% at the maximum cold rolling degree. This difference may be caused by high austenite stability by adding alloying elements (Mn and Ni). As the cold rolling degree increased, the tensile strength linearly increased, and the elongation decreased due to the fractional increment in the volume of martensite. However, the damping capacity increased until a 30% cold rolling degree was approached, and then decreased. The irregular tendency of the damping capacity was confirmed, depicting that it increased to a specific degree and then decreased as the tensile strength and elongation increased. Concerning the relationship between the tensile properties and the damping capacity, the damping capacity increased and culminated, and then decreased as the tensile properties and elongation increased. The damping capacity in the high-strength area tended to decrease because it is difficult to dissipate vibration energy into thermal energy in alloys with high strength. In the low-strength area, on the other hand, the damping capacity increased as the strength increased since the increased volume fraction of ε-martensite is attributed to the increase in the damping source.
研究了冷轧Fe-20Mn-12Cr-3Ni-3Si合金的拉伸性能和阻尼能力。确定了马氏体转变，包括具有特定取向的表面起伏和部分相交。此外，随着冷轧程度的增加，ε-马氏体的体积分数增加，而α'-马氏体在15%的冷轧程度时开始形成，并在最大冷轧程度时略有增加至6%。这种差异可能是由于添加合金元素（Mn和Ni）导致奥氏体稳定性高所致。随着冷轧程度的增加，抗拉强度线性增加，而伸长率由于马氏体体积分数的增加而降低。然而，阻尼能力在接近30%的冷轧程度之前增加，然后降低。证实了阻尼能力的不规则趋势，即随着抗拉强度和伸长率的增加，它先增加到一定程度然后降低。关于拉伸性能与阻尼能力之间的关系，阻尼能力随着拉伸性能和伸长率的增加而增加并达到峰值，然后降低。高强度区域的阻尼能力趋于降低，因为在高强度合金中难以将振动能量耗散为热能。另一方面，在低强度区域，由于ε-马氏体体积分数的增加归因于阻尼源的增加，阻尼能力随着强度的增加而增加。
