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为了研究Al和P合金元素在TRIP钢固态相变过程中的重要作用,利用热膨胀实验、金相观察、显微硬度测量等方法绘制了4种不同Al和P含量的C-Mn-Al-P TRIP钢的CCT图.结果表明,Al元素强烈缩小奥氏体相区,提高Ac3与Ms,促使CCT图左移和上移.P元素能够阻碍碳化物的生成,当钢中w(P)达到0.14%时,能显著将CCT曲线图中的珠光体区与贝氏体区右移.P元素对先共析铁素体相变和马氏体相变没有显著影响.随着冷却速率的增加,材料的显微硬度增加.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.添加固溶强化元素可以强化铁素体基体,增加铁素体基体的硬度,P元素固溶强化能力最强,Mn元素稍弱,Al元素很弱.
In order to study the important role of Al and P alloying elements in solid phase transformation of TRIP steels, four kinds of C-Mn-Al-P with different Al and P contents were drawn by means of thermal expansion test, metallographic observation and microhardness measurement. TRIP steel.The results show that the Al element strongly reduces the austenite phase area and enhances Ac3 and Ms, which leads to the CCT shift to the left and up.P element can hinder the formation of carbides, and when the w (P) in the steel reaches 0.14%, the pearlite region and bainite region in the CCT curve can be markedly shifted to the right, while the P element has no significant effect on the proeutectoid ferrite transformation and the martensite transformation.With the increase of the cooling rate , The material increases the microhardness.For each component exceeds its critical cooling rate will be completely martensite.Add solid solution strengthening elements can strengthen the ferrite matrix to increase the hardness of the ferrite matrix, P element The strongest solid solution strengthening ability, Mn weaker, Al weak.