Effect of annealing temperature on microstructure and properties of tungsten-rhenium alloys
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摘要: 采用粉末冶金工艺制备了钨铼合金，通过拉伸性能测试、硬度测试、光学显微观察等手段，研究了退火温度对钨铼合金组织和性能的影响。研究表明：锻造后的钨铼合金室温抗拉强度为1620 MPa，断后伸长率为20%，维氏硬度为HV30 540。钨铼合金在1500 ℃时开始发生局部再结晶，1700 ℃时发生晶粒长大。钨铼合金的室温抗拉强度、维氏硬度随着退火温度的提高而降低，断后伸长率随着退火温度的升高先增大后减小。Abstract: W−Re alloys were prepared by powder metallurgy. The effect of annealing temperature on the microstructure and properties of the W−Re alloys were investigated by tensile mechanical properties testing, hardness testing, and optical microscope analysis. The results show that, the room temperature tensile strength of the forged W−Re alloys is 1620 MPa, the elongation after fracture is 20%, and the Vickers hardness is HV30 540. Local recrystallization occurs at 1500 ℃ and the grain growth occurs at 1700 ℃. The room temperature tensile strength and hardness of the W−Re alloys decrease with the increase of annealing temperature, and the elongation after fracture first increases and then decreases with the increase of annealing temperature.
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图 1 W−25Re合金金相组织：（a）烧结态；（b）锻造态
Figure 1. Metallographic structure of the W−25Re alloys: (a) as-sintered; (b) as-forged
图 2 退火温度对W−25Re合金显微组织的影响：（a）室温；（b）1300 ℃；（c）1400 ℃；（d）1500 ℃；（e）1600 ℃；（f）1700 ℃
Figure 2. Effect of annealing temperature on the microstructure of the W−25Re alloys: (a) room temperature; (b) 1300 ℃; (c) 1400 ℃; (d) 1500 ℃; (e) 1600 ℃; (f) 1700 ℃
图 3 退火温度对W−25Re合金室温硬度的影响
Figure 3. Effect of annealing temperature on the hardness of the W−25Re alloys
图 4 W−25Re合金室温抗拉强度、断后伸长率与退火温度的关系
Figure 4. Relationship between the tensile strength at room temperature, elongation after fracture, and annealing temperature of the W−25Re alloys
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