临界区退火对含磷低硅TRIP钢组织性能的影响

在实验条件下对含磷TRIP(transformation inducedplasticity)钢进行临界区退火研究，主要研究了不同退火条件对实验钢组织和力学性能的影响.通过添加P元素降低钢中的Si含量，可改善表面质量，解决镀锌问题，且P价格低廉，成本降低.结果表明:随等温时间增加，贝氏体含量增加，抗拉强度增加；在两种等温温度下，残余奥氏体量都是呈先增加后降低的趋势，780℃等温时在180s时得到最大的残余奥氏体量22%，800℃等温时在90s时得到最大的残余奥氏体量20%；780℃等温180s时获得最佳力学性能，强塑积达22854MPa·%，P的加入并未引起力学性能损失，各项力学性能优良.

Effects of Intercritical Annealing on Microstructure and Mechanical Properties of Low Silicon TRIP Steel with Phosphorus Addition〓

The microstructure and mechanical properties for low silicon transformation induced plasticity (TRIP) steels with phosphorus addition under different annealing conditions were investigated in laboratory. The addition of low price element phosphorus reduced the silicon content which improved surface qualityand solved galvanizing problem with lowercosts. The results showed that the tensile strength increased with the increase of the annealing time， the tendency of the amount of the retained austenite first increased and then decreased at both intercritical temperatures. The largest amount of the retained austenite was 22% at the constant temperature of 780℃ for 180s while 20% at the constant temperature of 800℃ for 90s. The steels had excellent mechanical properties with the product of the tensile strength and elongation of 22854MPa·% when annealing at constant temperature of 780℃ for 180s. No mechanical property loss were caused by the phosphorus addition and the mechanical properties of the low silicon TRIP steels were excellent.