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OALib Journal期刊
ISSN: 2333-9721
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固溶氢对ta15钛合金电子束焊接头疲劳扩展寿命的影响
Keywords: 金属材料,？固溶氢,？ta15,？焊接接头,？疲劳扩展寿命
Abstract:
？对ta15钛合金电子束焊接试样充氢,研究了氢对其显微组织形态和接头疲劳扩展寿命的影响。结果表明:充氢含量低于0.105\%时,氢以固溶态存在于合金中,并未形成氢化物;母材抗疲劳扩展的能力高于焊缝区;随着充氢含量的增加,接头的疲劳寿命大幅下降。其原因是,微量氢的存在降低了ta15合金的韧性,固溶氢提高了疲劳裂纹的扩展速率。氢在边界处的聚集加速了焊接接头内裂纹沿马氏体束边界的扩展,导致在断口形成了“团结构”这一特殊组织形态。
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