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含铬高硅TRIP钢室温变形时通常具有较长的屈服平台,在成型过程中零件表面容易出现褶皱等缺陷.为了解决这个问题,采用预拉伸实验研究了不同预拉伸变形量对TRIP钢屈服平台的影响,并且对拉伸前后的TRIP钢试样做了TEM透射分析以期找出形成屈服平台的机制.实验表明:随着预拉伸量增加,屈服平台长度减少,当预变形量达到1.0%时屈服平台消失;在相同预拉伸条件下,奥氏体越稳定,屈服平台越短;柯氏气团和奥氏体的应力松弛机制共同对TRIP钢屈服平台的形成起作用.
Chromium-rich high-silicon TRIP steel usually has long yielding platform during deformation at room temperature, and defects such as wrinkles easily appear on the surface of the component during the forming process.To solve this problem, pre-stretch experiments were conducted to study the effect of different pre-stretching deformation on the properties of TRIP steel And the effect of yielding platform was analyzed.The TEM transmission analysis of the TRIP steel samples before and after stretching was carried out to find out the mechanism of yield platform.The experimental results show that the length of yield platform decreases with the increase of pretensioning amount, At 1.0%, the yield platform disappears. The more stable the austenite and the shorter the yield platform under the same pre-tensioning condition, the stress relaxation mechanism of the Kirschner air mass and the austenite together contributes to the formation of the yield platform of the TRIP steel.