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利用扫描电子显微镜(SEM)、X射线衍射(XRD)以及室温单轴拉伸试验研究了临界区退火温度对低合金冷轧C-Mn-Al-Si系TRIP钢微观组织及力学行为的影响。结果显示,随着临界区退火温度的升高,TRIP钢组织中铁素体相和残留奥氏体相的含量降低,而贝氏体相的含量不断增加;试验钢的屈服强度和抗拉强度均提高,而塑性则不断下降。高临界区温度下形成了较多的贝氏体相,大量位于贝氏体板条间的片状残留奥氏体因变形过程中过于稳定而无法使TRIP效应得以充分的发挥,从而影响材料加工硬化能力的提高。
The effects of critical annealing temperature on the microstructure and mechanical behavior of low alloy cold-rolled C-Mn-Al-Si TRIP steels were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and uniaxial tensile tests at room temperature. The results show that the content of ferrite phase and residual austenite phase decreases and the content of bainite phase increases with the increase of annealing temperature in the critical region. The yield strength and tensile strength of the test steel are both Improve, while the plastic is declining. More bainite phase is formed in the high critical zone temperature. A large amount of retained austenite in the bainite lath can not be fully exerted due to the over-deformation during the deformation, which affects the material processing Increased hardening ability.