微量氢对电子束焊接TA15钛合金疲劳寿命的影响

稀有金属材料与工程, 2012, 41(2): 304-309.

微量氢对电子束焊接TA15钛合金疲劳寿命的影响

籍龙波 ^1, , 胡树兵 ^2, , 陈冀彦 ^3, , 李行志 ^4, , 肖建中 ^5, , 张辽 ^6,

1.华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074

2.华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074

3.华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074

4.华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074

5.华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074

6.华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074

关键词： TA15钛合金 , 电子束焊接 , 氢 , 疲劳寿命

Effect of Trace Hydrogen on the Fatigue Lives of Electron Beam Welded TA15 Titanium Alloys

对TA15钛合金电子束焊接试样进行充氢,研究了充氢对显微组织形态的影响,并对微量氢对TA15疲劳寿命影响进行考察.显微组织研究表明:充氢量低于0.105％(质量分数)时,氢以固溶态存在于合金中,并未形成氢化物.疲劳试验结果表明:随充氢量的增加,疲劳寿命大幅下降；这是由于微量氢的存在降低了TA15合金的韧性,固溶氢增加了疲劳裂纹的扩展速率,且氢通过影响裂纹尖端的性能加速疲劳裂纹扩展.焊缝区马氏体束呈团状结晶,且以团为单位统一变形,导致断口上呈团簇形态；且氢对马氏体团疲劳扩展中的行为有一定影响.

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材料期刊网

微量氢对电子束焊接TA15钛合金疲劳寿命的影响

Effect of Trace Hydrogen on the Fatigue Lives of Electron Beam Welded TA15 Titanium Alloys

参考文献