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用小坩埚重熔试验法。以5C/分的冷却速度模拟工业钢锭,研究了加入微合金元素对 M2钢凝固组织的影响。试验涉及11个元素,共25个方案,用定量金相研究了凝固组织的特征参数,并提出共晶碳化物均一性的概念,根据小坩埚试验提供的方向。在150公斤感应炉上进一步试验,对钢锭和钢材检验评级,试验结果表明:强碳化物形成元素:钙等对凝固组织有变性作用;复合微合金化的效果优于单元素使用的效果;氮、稀土等元素可参与复合,微合金化可以改善铸态组织和钢材的碳化物不均匀度。但对低倍组织没有明显作用。试验还发现,共晶莱氏体与包晶奥氏体的边介,随加入微合金元素不同,可呈光滑型和波浪形。
Small crucible remelting test method. The industrial steel ingot was simulated at a cooling rate of 5C / min, and the effect of adding micro alloying elements on the solidified structure of M2 steel was studied. The experiment involved eleven elements in a total of 25 protocols. The characteristic parameters of the solidified structure were investigated by quantitative metallography and the concept of eutectic carbide homogeneity was proposed according to the direction provided by the small crucible test. Further tests were carried out on a 150 kg induction furnace to test the ingot and steel grades. The test results showed that the formation of strong carbides, such as calcium, had a denaturing effect on the solidified structure; the effect of the composite microalloying was superior to that of the single element; the nitrogen , Rare earth and other elements can participate in the composite, micro-alloying can improve the as-cast structure and steel carbide unevenness. However, it has no obvious effect on low magnification organizations. The experiment also found that the eutectic ledeburite and peritectic austenite side of the medium, with the addition of microalloying elements can be smooth and wavy.