摘要
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 ranged from 0.1%—1.0% on microstructure and superplastic deformation of Ti-6Al-4V was studied. The results state that the favourable effect on the superplasticity of the alloy has been found when the content of hydrogen is less than 0.35wt%. The optimum range is between 0.2%—0.3%, Where hydrogen malc(?)s flow stress reduce about 40% and Plasticity raise 10—80%.If hydrogen con- tent is betw een 0.4%—0.5%, the plasticity decreases obviously with the decreasing of flow stress because of the coarse grains. However, when hydrouen is greater than 0.5wt%, both flow stress and plasticity increase with increasing of hydrogen due to the refining of the grains, forming of TiH_2 as well as the strengthering elfect cansed by a large amount of hydrogen dissolved in.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
1991年第5期52-58,共7页
Rare Metal Materials and Engineering
