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首页> 外文会议>International Conference on Superplasticity in Advanced Materials;ICSAM; 20060623-26;20060623-26; Chengdu(CN);Chengdu(CN) >Superplastic bulging capability of Ti-6Al-4V butt-welded plate by high energy beam welding
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Superplastic bulging capability of Ti-6Al-4V butt-welded plate by high energy beam welding

机译：高能束焊接对Ti-6Al-4V对接板的超塑性膨胀能力

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摘要

The superplastic bulging capabilities of Ti-6Al-4V butt-welded plates with 0.8mm in thickness with high energy beam welding methods namely plasma arc welding (PAW), electron beam welding (EBW) and laser beam welding (LBW) are studied in virtue of superplastic bulging tests. Superplastic bulging tests are performed at the superplastic forming temperature 925℃ under 1MPa gas pressure. The superplastic bulging capability is represented by the maximum relative bulging height h after fracture. Experimental results suggest that all of butt-welded plates with high energy beam welding methods possess good superplastic bulging capability. Among them, the maximum relative bulge height of LBW is the highest, that of EBW is slightly lower and that of PAW is the lowest. The higher the input energy density is, the bigger the bulge height will be. Furthermore their microstructure evolutions of various weld metals during superplastic bulging were systematically analyzed via metallographical tests. The relation between the microstructure of weld metal and its superplasticity is found. Metallographical analysis shows that the microstructure of TU6AI-4V weld metal with high energy beam welding methods is composed of fine acicular martensite. The higher the input energy density is, the finer the martensite structure will be. Upon heating, this martensite changes to a basketweave-like structure and upon bulging, the martensite structure have the trend of transforming to fine equiaxed grain. This can explained the reason why the Ti-6Al-4V butt-welded plates with high energy beam welding methods have excellent superplastic bulging capability.
机译：研究了厚度为0.8mm的Ti-6Al-4V对接板的超塑性膨胀性能，采用等离子弧焊（PAW），电子束焊（EBW）和激光束焊（LBW）等高能束焊接方法进行研究。超塑性膨胀测试。在1MPa气压下在925℃的超塑性成形温度下进行超塑性膨胀试验。超塑性膨胀能力由断裂后的最大相对膨胀高度h表示。实验结果表明，所有采用高能束焊接方法的对接焊接板都具有良好的超塑性膨胀能力。其中，LBW的最大相对凸起高度最高，EBW的最大相对凸起高度略低，而PAW的最大相对凸起高度最低。输入能量密度越高，凸出高度越大。此外，通过金相测试系统地分析了它们在超塑性膨胀过程中各种焊接金属的微观组织演变。发现了焊接金属的微观结构与其超塑性之间的关系。金相分析表明，采用高能束焊接方法的TU6AI-4V焊接金属的显微组织为细针状马氏体。输入能量密度越高，马氏体组织越细。加热时，该马氏体变为篮状组织，鼓胀时，马氏体具有向细等轴晶转变的趋势。这可以解释为什么采用高能束焊接方法的Ti-6Al-4V对焊板具有出色的超塑性膨胀能力。

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