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1)  compact tensile specimen of Titanium 55 alloy
Ti55合金氢致延迟裂纹
2)  hydrogen embrittlement crack
氢致延迟裂纹
1.
The results show that tiny crack main by using the unqualified protect gas(Ar)during welding could cause the increasing hydrogen contain in the weld area,created the hydrogen embrittlement crack.
7倍,在焊缝热影响区造成增氢,导致氢致延迟裂纹的产生。
3)  delayed hydride cracking
氢致延迟开裂
1.
The purpose of the present study was to investigate critical temperature for initiating and arresting delayed hydride cracking in Zr-Sn-Nb alloy.
1Cr)发生氢致延迟开裂(DHC)临界最大开裂温度(T_c)和临界最小止裂温度(T_h)随氢含量的变化规律;同时对裂纹尖端偏聚氢含量及静水应力和发生DHC的临界氢含量进行了理论分析,建立理论模型对临界温度进行理论计算。
4)  electron beam wleding compact tensile specimen
电子束焊缝氢致延迟裂纹
5)  delay crack
延迟裂纹
1.
This trifurcated connector is with the features of optimized welding process and thermal process can avoid bigger delay crack and constrain stress.
介绍了中、高压管线系统中焊制三通的具体制造情况 ,该三通具有合理的对口标准、严格优选的焊接工艺和热处理工艺 ,并且克服了延迟裂纹及拘束应力过大等不利因素。
6)  delayed crack
延迟裂纹
1.
The result showed that the crack of feed-water pipe saddle was a delayed crack,because welding procedure code didn\'t control well,carbon equivalent of welding components have obvious quench trend and welding didn\'t avoiding hydrogen treatment,welding structure and larger thickness of welding components occured constrain stress etc.
结果表明:由于焊接工艺规范控制不当,未及时进行消氢处理,焊件的碳当量提高具有明显的淬硬倾向,焊接结构和较大的焊件厚度引起拘束应力等综合作用产生了延迟裂纹。
补充资料:延迟裂纹
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性质:冷裂纹中一种比较普遍的形态,它的主要特点是在焊后并不立即出现,而要经过几小时、几十小时或更长时间的孕育期才形成的冷裂纹,由于产生延迟现象,故称延迟裂纹。此类裂纹的生成和扩展决定于材料的淬硬倾向、焊接接头的应力状态和焊缝金属扩散氢的含量等三个因素交互作用的结果。

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