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用低活化元素Ti替代高活化的Co制备9Cr3W系列钢,用金相观察、SEM观察、拉伸实验及蠕变实验等手段对其进行表征,研究了分别加入Ti和Co对9Cr3w钢力学性能的影响。结果表明,Co和Ti的添加促进析出相的析出,Ti使品粒细化,使拉伸性能和蠕变性能显著提高;Ti的添加使基体中出现少量的δ铁素体,但选择单相奥氏体区间热处理可使其消除,得到单一马氏体组织的低活化钢。对低活化9Cr3W钢进行Ti的微合金化,可获得与添加1%Co相当的良好蠕变性能。
9Cr3W series steels were prepared by using low activation element Ti instead of highly activated Co, and characterized by metallographic observation, SEM observation, tensile test and creep test. The effects of adding Ti and Co on the mechanical properties of 9Cr3w steel influences. The results show that the addition of Co and Ti promotes the precipitation of precipitated phase, and the grain refinement of Ti makes the grain refinement significantly improve the tensile properties and creep properties. The addition of Ti makes a small amount of δ ferrite appear in the matrix, Austenite interval heat treatment can eliminate it, resulting in a single martensite low activation steel. Micro-alloying Ti with low activation 9Cr3W steel gives good creep performance comparable to that of 1% Co.