In this paper, near net shape casting technology was used to manufacture Cr12MoV steel die modified using RE-Ti. The samples with different RE(rare earth)-Ti content were fabricated by using the induction furnace. The microstructure of the samples was analyzed by using optical microscope and scanning electron microscope. Electronic universal tensile test machine, pendulum impact tester and rockwell apparatus were utilized to test the mechanical properties of the samples. The results show that after RE-Ti compound modification, the distribution and morphology of carbide are improved, and with the Ti increase, the impact toughness significantly increases, and tensile strength has a slight increase, but hardness is almost unchanged. When Ti content is 0.6%, the impact toughness and tensile strength are 14.9 J/cm² and 634 MPa, respectively, reaching or approaching to the mechanical properties of the forged Cr12MoV steel.

本文采用近净成形技术制造了用RE-Ti改性的Cr12MoV钢模具。用感应炉制备了稀土（Ti）-Ti含量不同的样品。用光学显微镜和扫描电子显微镜分析样品的微观结构。利用电子万能拉伸试验机，摆锤冲击试验仪和洛氏仪器测试样品的机械性能。结果表明，稀土-钛化合物改性后，碳化物的分布和形貌得到改善，且随着钛含量的增加，冲击韧性显着提高，抗拉强度略有提高，但硬度几乎保持不变。当Ti含量为0.6％时，冲击韧性和拉伸强度为14.9J / cm ^2。 和634 MPa，分别达到或接近锻造Cr12MoV钢的机械性能。