【摘要】 采用真空热压烧结工艺制备了氧化物弥散强化（oxide dispersion strengthened, ODS）HT9钢，测定了不同烧结温度和不同烧结压力条件下试样的致密度及维氏硬度、拉伸强度、伸长率等力学性能，利用金相显微镜、X射线衍射仪、扫描电子显微镜等设备分析了不同烧结参数对ODS-HT9钢微观结构、物相组成、断口形貌的影响。结果表明：烧结温度的提高，有利于粉末颗粒的粘结，提高试样的致密度。烧结温度为1 050℃时，试样的致密性最好，具有较好的综合性能，硬度、抗拉强度和伸长率分别是647HV、916.1 MPa和10.7%，断口呈塑性断裂。随着烧结压力的提高，试样的硬度、抗拉强度和伸长率逐渐增大，致密度显著提高。当烧结压力超过30 MPa后，试样致密度、硬度、拉伸强度和伸长率增大的趋势减缓。更多还原

【Abstract】 【Objective】 The objective of this paper is to prepare oxide dispersion strengthened(ODS) HT9 steel by vacuum hot pressing sintering, and to investigate the effects of different sintering temperatures and pressures on the mechanical properties, microstructure, phase composition and fracture morphology of the prepared ODS-HT9 steel.【Method】 ODS-HT9 steel was fabricated via vacuum hot pressing sintering. The density, HV, tensile strength and elongation of sintered samples under different temperatures and pressures were tested. The effects of sintering parameters on microstructure, phase composition and fracture morphology of ODS-HT9 steel were analyzed by means of optical microscope, XRD and SEM.【Result】 The increase of sintering temperature is beneficial to the adhesion of powder particles and the densification of samples. When the sintering temperature is 1 050 ℃, the relative density of the sample is the best, comprehensive properties are better, and the typical ductile fracture occurs. The hardness, tensile strength and elongation are 647 HV, 916.1 MPa and 10.7%, respectively. With the increase of sintering pressure, the hardness, tensile strength and elongation of the samples increase gradually, and the density of the samples increases significantly. When the sintering pressure is more than 30 MPa, the increasing trend of density, hardness, tensile strength and elongation of the samples becomes slower.【Conclusion】 Sintering temperature and pressure exert pronounced effects on the microstructure and mechanical properties of ODS-HT9 steel. Moderate elevation of sintering temperature and pressure facilitates powder bonding and material densification, which further enhances the mechanical performances of sintered specimens.更多还原