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采用喷射成形技术制备了 Cr12 Mo V钢 ,应用金相、X射线衍射分析、差热分析等实验手段对该钢的微观组织及性能进行了分析和研究 .结果表明 ,喷射成形 Cr12 Mo V钢的显微组织得到了显著的细化 ,与 Cr12 Mo V钢铸态组织不同处在于其主要由奥氏体组成 .由于喷射成形过程中的冷却速度快 ,奥氏体中高度固溶了碳及合金元素 ,其晶格常数达 0 .362 0 nm,且喷射成形钢的马氏体起始转变温度 (Ms)亦低于常规工艺制备的钢的 Ms.随着时效温度的升高 ,亚稳奥氏体逐渐发生了转变 ,Cr12 Mo V钢的硬度在 570°C时效温度处出现峰值 ,由时效处理前的 HRC38增大至 HRC60 .时效合金主要由马氏体构成 .当时效温度高于 570°C时 ,Cr12 Mo V钢的硬度剧烈下降 .因此 ,570°C是喷射成形 Cr12 Mo V钢进行时效处理的临界温度 .
The microstructure and mechanical properties of Cr12 Mo V steel were investigated by means of metallographic examination, X-ray diffraction analysis and differential thermal analysis. The results show that the mechanical properties of Cr12 Mo V steel Microstructure has been significantly refined, and Cr12 Mo V cast steel is different from the organization mainly composed of austenite.Due to the rapid cooling during injection molding, the austenite is highly soluble in carbon and alloys Element, the lattice constant of which is 0.362 0 nm, and the martensitic transformation temperature (Ms) of the spray-formed steel is also lower than that of the steel prepared by the conventional process. As the aging temperature increases, The hardness of Cr12 Mo V steel peaked at the aging temperature of 570 ° C and increased from HRC38 before aging to HRC 60. The aged alloy was mainly composed of martensite.When the aging temperature was higher than 570 ° C, the hardness of Cr12 MoV steels decreases sharply, so 570 ° C is the critical temperature for the shot-formed Cr12 MoV steel to age.