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Hot ductility behaviour of high-Mn TWIP steels

机译：高锰TWIP钢的热延性行为

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摘要

The hot ductility behaviour of four high-Mn TWIP steels has been studied by hot tensile testing in the temperature range 700-1300℃ at a strain rate of 1 s~(-1) For all the studied steels with the single-phase austenitic structure, the hot ductility based on the reduction of area of tensile strained specimens is good. In the temperature range 1000-1200℃, dynamic recrystallization takes place and consequently the ductility is enhanced. Grain refinement by reheating at the lower reheating temperature (1150℃) significantly improves the hot ductility through inducing faster dynamic recrystallization. During high temperature deformation, 1.5 wt.% of Al alloying is found to have a beneficial effect on the hot ductility due to strengthening of the steel, whereas the 0.019 wt.% Nb alloying has insignificant effect. With high Al (3 wt.%) and Si (3 wt.%) alloying, the formation of ferrite phase at high temperatures along the austenite grain boundaries has the most deleterious effect on the hot ductility behaviour. Grain boundary sliding was recognized as the failure mechanism in the studied steels.
机译：通过在700-1300℃温度范围内以1 s〜（-1）的应变速率进行热拉伸试验，研究了四种高锰TWIP钢的热延性行为。对于所有研究的单相奥氏体结构钢，基于拉伸应变试样的面积减小的热延展性良好。在1000-1200℃的温度范围内，会发生动态重结晶，从而延展了塑性。通过在较低的再加热温度（1150℃）下再加热来细化晶粒，可以通过诱导更快的动态再结晶来显着提高热延展性。在高温变形期间，由于钢的增强，发现1.5重量％的Al合金化对热延展性具有有益的作用，而0.019重量％的Nb合金化作用不明显。随着较高的Al（3 wt。％）和Si（3 wt。％）合金化，高温下沿着奥氏体晶界形成铁素体相对热延性行为的影响最大。晶界滑动被认为是研究钢的破坏机理。

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