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研究了氢含量从0.1%—0.95%范围内对Ti-6Al-4V显微组织和高温超塑性变形的影响。结果表明,氢含量小于0.35wt%时,对合金的超塑性变形产生明显的有利影响,氢使流变应力明显下降,并使塑性提高。氢的这一有利影响在其含量为0.2%—0.3%时最佳,氢使流变应力降低约40%,同时使塑性提高10%—80%。氢含量为0.4%—0.5%时,由于组织晶粒粗大,塑性在流变应力下降的同时也明显下降,含量大于0.5wt%以后,由于氢使组织晶粒细化及氢化物相TiH_2的形成和大量氢溶入造成的强化作用等,使流变应力和塑性又随氢含量的增加而显著提高。
The effect of hydrogen content from 0.1% to 0.95% on the microstructure and high temperature superplastic deformation of Ti-6Al-4V was studied. The results show that hydrogen content of less than 0.35wt%, the superplastic deformation of the alloy had a significant beneficial effect, hydrogen flow stress decreased significantly, and the plastic increased. This favorable effect of hydrogen is optimal at 0.2% -0.3%, with hydrogen reducing the flow stress by about 40% and increasing the ductility by 10% -80%. Hydrogen content of 0.4% -0.5%, due to coarse grain, plastic rheological stress decreases at the same time significantly decreased, the content is greater than 0.5wt%, due to the hydrogen to refine the grain structure and the formation of hydride phase TiH_2 And a large number of hydrogen due to the role of strengthening the role of the flow stress and plasticity and hydrogen content increased significantly increased.