热等静压TiC_p/30CrNi4Mo钢基复合材料的组织与性能

Microstructure and properties of TiC_p/30CrNi4Mo steel-based composites prepared by hot isostatic press

采用球磨与热等静压相结合的方法制备TiC_p/30Cr Ni4Mo钢基复合材料,研究材料的显微组织、密度、硬度、常温和高温拉伸性能以及摩擦磨损性能。结果表明,TiC_p/30Cr Ni4Mo钢基复合材料的组织均匀细小,基体组织主要为细片状珠光体、铁素体和少量残余奥氏体,Ti C颗粒弥散分布在基体上,与基体结合牢固;复合材料的相对密度高达99.7%,硬度为49 HRC,抗拉强度高达1 266 MPa,伸长率为4.0%;复合材料具有较好的高温力学性能,400℃时复合材料抗拉强度仍高达1 135 MPa;在200 N载荷条件下,复合材料的耐磨损性能较原30Cr Ni4Mo材料提高约4倍,磨损形式主要表现为轻微的磨粒磨损;复合材料经950℃水淬和520℃回火后,抗拉强度高达1 325 MPa,伸长率为4.6%。

TiCp/30CrNi4Mo steel-based composites were prepared by ball milling and hot isostatic press （HIP）. The physical and mechanical properties, including density, hardness, tensile strength at room temperature and high temperature, and wear resistance of composites were investigated. Results show that the composite has fine microstructure with uniform distribution of TiC particles. The TiC particles have a good bonding with the matrix which composed of pearlite, ferrite and a little residual austenite. The relative density, tensile strength, elongation and hardness of the composite are 99.7%, 1 266 MPa, 4.0% and 49 HRC, respectively. The tensile strength of the composite still reaches 1 135 MPa at 400℃, showing good high temperature mechanical property. The wear resistance of the composite increases by 4 times compared with 30CrNi4Mo steel under a load of 200 N. The strength and elongation of the composite reach 1325 MPa and 4.6% after water quenching at 950℃ and tempering at 520℃.