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研究了微波烧结温度和时间对钨基合金挤压棒坯显微组织及力学性能的影响。采用高倍SEM和光学金相显微镜分别对合金断口和显微组织进行了形貌观察;对合金相对密度、抗拉强度、延伸率和硬度进行了测定和分析。结果表明:当微波烧结时间为30min时,随着烧结温度的升高,合金性能呈峰值变化,烧结温度为1550℃时,合金的力学性能达到极大值,相对密度、抗拉强度、延伸率和HRC硬度分别为98.3%、920MPa、9.7%和30.5;当微波烧结温度为1550℃时,随着烧结时间的延长,合金的力学性能先上升后下降;随着微波烧结温度的升高及微波烧结时间的延长,钨晶粒的尺寸逐渐增大。
The effects of microwave sintering temperature and time on the microstructure and mechanical properties of tungsten-base alloy extruded bars were investigated. The morphology and morphology of the alloy fracture and the microstructure were observed by SEM and optical microscope. The relative density, tensile strength, elongation and hardness of the alloy were measured and analyzed. The results show that when the sintering time is 30 min, the properties of the alloy change sharply with the increase of the sintering temperature. When the sintering temperature is 1550 ℃, the mechanical properties of the alloy reach its maximum, and the relative density, tensile strength and elongation And HRC hardness were 98.3%, 920MPa, 9.7% and 30.5, respectively. When the sintering temperature was 1550 ℃, the mechanical properties of the alloy first increased and then decreased with the sintering time increasing. With the increase of microwave sintering temperature and microwave The sintering time is extended, the size of the tungsten grains gradually increases.