Abstract

The effect of the static tension rate in the range from 0.1 to 50 mm/min on the mechanical properties of austenitic–martensitic VNS9-Sh TRIP sheet steel with a low content (27%) of strain-induced martensite in the surface layer (27%) is investigated. The tensile strength and the relative elongation of the steel is shown to decrease when the strain rate increases due to the suppression of the TRIP effect, whereas the yield strength remains almost the same. As the loading rate increases, the yield strength first decreases and then, starting from a rate of 3 mm/min, increases to reach a value close to the yield strength at a loading rate of 50 mm/min. The fracture at a low strain rate (0.1 mm/min) occurs by the mode I fracture mechanism, and at a high rate (50 mm/min) it occurs by mode II fracture mechanism.

中文翻译：

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应变速率对低马氏体含量的奥氏体-马氏体TRIP钢板的力学性能的影响

摘要

静态张力速率在0.1至50 mm / min范围内对表面层中应变诱发马氏体含量低（27％）的奥氏体-马氏体VNS9-Sh TRIP钢板的机械性能的影响（27 ％）被调查。当由于TRIP效应的抑制而导致应变率增加时，钢的抗拉强度和相对伸长率降低，而屈服强度几乎保持不变。随着加载速率的增加，屈服强度首先降低，然后从3 mm / min的速率开始增加，以达到接近于50 mm / min加载速率的屈服强度的值。较低的应变速率（0.1 mm / min）通过模式I断裂机制发生，而较高的应变速率（50 mm / min）则通过模式II断裂机制发生。