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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
引用本文:籍龙波,胡树兵,陈冀彦,王亚军,李行志,肖建中.固溶氢对TA15钛合金电子束焊接头疲劳扩展寿命的影响[J].材料研究学报,2010(5).
作者姓名:籍龙波  胡树兵  陈冀彦  王亚军  李行志  肖建中
作者单位:华中科技大学材料成形与模具技术国家重点实验室;北京航空材料研究院;
基金项目:华中科技大学材料成型与模具技术国家重点实验室自主课题~~
摘    要: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。

关 键 词:金属材料  固溶氢  TA15  焊接接头  疲劳扩展寿命  

Influences of Solution Hydrogen on the Fatigue Crack Propagation Lives of TA15 Alloys Electron Beam Welded Joints
JI Longbo HU Shubing CHEN Jiyan WANG Yajun LI Xingzhi XIAO Jianzhong .State Key Laboratory of Material Processing , Die & Mould Technology,Huazhong University of Science & Technology,Wuhan.Influences of Solution Hydrogen on the Fatigue Crack Propagation Lives of TA15 Alloys Electron Beam Welded Joints[J].Chinese Journal of Materials Research,2010(5).
Authors:JI Longbo HU Shubing CHEN Jiyan WANG Yajun LI Xingzhi XIAO Jianzhong State Key Laboratory of Material Processing  Die & Mould Technology  Huazhong University of Science & Technology  Wuhan
Institution:JI Longbo~1 HU Shubing~(1**) CHEN Jiyan~1 WANG Yajun~2 LI Xingzhi~1 XIAO Jianzhong~1 1.State Key Laboratory of Material Processing , Die & Mould Technology,Huazhong University of Science & Technology,Wuhan 430074 2.Beijing Institute of Aeronautical Materials,Beijing 100095
Abstract:The influences of hydrogen on microstructure and fatigue behaviors of electron beam welding TA15 alloys were investigated.No hydride formed when less than 0.105%hydrogen were charged in TA15 welded joints.The substrates have better fatigue cracking resistance than that of the welded joint;and small amounts of charged hydrogen resulted in great drop of fatigue crack propagation life, because the exsited hydrogen reduced the toughness remarkably of the TA15 alloy in the welded joint and increased the fatigue ...
Keywords:metallic materials  solution hydrogen atom  TA15 alloy  welded joint  fatigue propagation life  
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