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为了探索合金元素在TRIP钢相变过程中的重要作用,利用金相、显微硬度等方法研究了四种不同合金成分C-Mn-Al-PTRIP钢的CCT图.结果表明:Al元素强烈地缩小奥氏体相区,提高Ac3与Ms;Al元素促使CCT图左移和上移.P元素能够阻碍碳化物生成,当钢中P质量分数达到0.14%时,能显著地将CCT图中的珠光体区与贝氏体区右移;P元素对铁素体相变和马氏体相变没有显著的影响.结果还显示出随着冷却速率的增加,材料的显微硬度随之增加.对于每一种成分,超过其临界冷却速率时,将得到完全的马氏体组织.
In order to explore the important role of alloying elements in the phase transition of TRIP steel, the CCT patterns of four different alloying components, C-Mn-Al-PTRIP, were studied by means of metallography and microhardness. The results show that the Al element strongly Reduce the austenite phase area, improve Ac3 and Ms; Al element to promote CCT diagram shift left and up .P element can hinder the formation of carbide, when the P content in steel reaches 0.14%, can significantly CCT The pearlite zone and the bainite zone move to the right, while the P element has no significant effect on the ferrite transformation and the martensitic transformation.The results also show that with the increase of the cooling rate, the microhardness of the material increases. For each composition, beyond its critical cooling rate, a complete martensite will be obtained.