Effect of Cooling Mode for Heat Treatment on Microstructure and Hardness of TC4 Alloy Prepared by TiH2 Powder Metallurgy
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摘要: 通过对TiH2粉末冶金方法制备的TC4合金进行热处理,研究不同热处理后冷却方式对TC4合金组织及硬度的影响。结果表明,固溶处理和时效处理均能提高合金的致密度,且固溶处理的冷却方式能显著影响TC4合金中α相和β相的比例,从而导致显微组织形态的变化,其中空冷的试样中再结晶生成细小的等轴状组织,平均晶粒直径最小;固溶处理能显著增加合金的硬度。Abstract: TC4 alloy prepared by TiH2 powder metallurgy was subjected to heat treatment and the effects of different cooling methods on microstructure and hardness of the TC4 alloy were studied. The results show that both solid solution treatment and aging treatment can densify the alloy. In addition, the cooling method of solid solution treatment can significantly affect the proportion of α phase and β phase in the TC4 alloy, resulting in the change of microstructure. The recrystallization in the air-cooled sample produces fine equiaxed structure with the smallest average grain diameter. Solid solution treatment can significantly increase the hardness of the alloy.
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Key words:
- TC4 /
- powder metallurgy /
- TiH2 /
- heat treatment /
- microstructure /
- hardness
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