籍龙波,胡树兵,李行志,王亚军,陈冀彦,肖建中

• 1:华中科技大学材料成形与模具技术国家重点实验室
• 2:北京航空材料研究院

摘要(Abstract)：

对Ti-6Al-4V钛合金电子束焊接试样进行高温气体渗氢,研究了置氢对显微组织形态的影响,并对微量氢对Ti-6Al-4V疲劳寿命的影响进行考察。显微组织研究结果表明:置氢浓度低于0.120 wt%时,氢以固溶态存在于合金中,并未形成氢化物;位错在次生的α、β相区聚集,α/β相界往往是裂纹萌生的根源。疲劳实验结果表明:随置氢浓度的增加,疲劳寿命大幅下降;这是由于微量氢的存在降低了Ti-6Al-4V的韧性,并加速疲劳裂纹的扩展,从而降低了疲劳寿命。

关键词(KeyWords)： Ti-6Al-4V;电子束焊接;氢;疲劳寿命

Abstract:

Keywords:

基金项目(Foundation): 华中科技大学材料成形与模具技术国家重点实验室基金项目(09-10);; 2010年省部产学研合作重大项目(2010A090200047);; 国家磁约束核聚变能研究专项(2010GB109000)

作者(Author): 籍龙波,胡树兵,李行志,王亚军,陈冀彦,肖建中

DOI: 10.13289/j.issn.1009-6264.2011.06.023

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