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IMPROVEMENT OF JOINT EFFICIENCY FOR FUNCTIONAL MATERIALS

提高功能材料的联合效率

基本信息

批准号：
62420049
负责人：
KIKUCHI Yasushi
金额：
$ 17.02万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1989
项目状态：
已结题

项目摘要

A wide variety of ferrous and non-ferrous materials of high functions have been bonded by the fusion welding and solid state bonding, and the microstructure of joints have been investigated in order to reveal the controlling factor of the joint efficiency and to develop the measure for its improvement. Results obtained are summarized as follows: 1. The fusion welding of stainless steels SUS304, SUS316 and SUS329JI has been systematically investigated with particular reference to the effects of welding atmosphere and heat cycle on the weldability and joint efficiency. As to the atmosphere, the welding parameters for realizing good weldability were determined in high pressure atmosphere up to 6 MPa, and the fracture toughness of weld metal was examined as a function of the partial pressure of oxygen. The weld heat cycle was found to have strong effects on the grain boundary segregation of P, which accelerated the intergranular stress corrosion cracking significantly. 2. The microstructur … More e of the weld heat affected zone of Ti-6Al-4V alloy was investigated to interpret the effects of the weld heat cycle on the mechanical properties and hydrogen induced cracking. 3. In order to apply the diffusion bonding to Al/Al_2O_3 and Al/SiC composites, the effects of surface treatments and intermediate metals on the bond strength have been systematically investigated. The surface treatment of electropolishing and the iritermediale metal of Al-Mg-Cu alloy were found to improve the bond strength, and their effects were discussed in relation to the wetting of the fiber by the intermediate metal. 4. For the friction welding of the Cu-W sintered alloy to copper, the effects of W content on the behavior of welds and the microstructure have been examined to explain controlling factors of the joint efficiency and its mechanism. 5. The fusion welding of NiTi alloy with shape memory effect have been carried out in various atmospheres. Though sound weld beads were obtained in inert atmospheres, the microstructure of the weld obtained was quite different from that of the base metal, suggesting that the ghape memory effect of the joint was significantly degraded. 6. The effects of martenstic, bainitic and ferritic microstructures on the stress relief cracking has been investigated for HT80 steel. Less

采用熔焊和固态连接技术对多种黑色和有色金属高性能材料进行连接，并对接头的微观组织进行了研究，以揭示影响连接效率的因素，并提出提高连接效率的措施。主要研究结果如下：1.本文系统地研究了不锈钢SUS 304、SUS 316和SUS 329 JI的熔焊工艺，着重研究了焊接气氛和热循环对焊接性和接头效率的影响。对于气氛，在高达6 MPa的高压气氛中确定了实现良好焊接性的焊接参数，并检查了焊缝金属的断裂韧性作为氧分压的函数。焊接热循环对P的晶界偏聚有很大影响，P的晶界偏聚显著加速了沿晶应力腐蚀开裂。2.微观结构 ...更多信息研究了Ti-6Al-4V合金焊接热影响区热循环对力学性能和氢致裂纹的影响。3.为了将扩散连接技术应用于Al/Al_2O_3和Al/SiC复合材料，系统地研究了表面处理和中间金属对连接强度的影响。电解抛光和Al-Mg-Cu合金的中间金属的表面处理被发现可以提高结合强度，并且它们的效果与中间金属对纤维的润湿有关。4.针对铜-钨烧结合金与铜的摩擦焊，研究了钨含量对接头性能和微观组织的影响，以解释接头效率的控制因素及其机理。5.对具有形状记忆效应的NiTi合金在不同气氛下进行了熔焊试验。虽然在惰性气氛中获得了良好的焊缝，但所获得的焊缝的显微组织与母材的显微组织有很大不同，这表明接头的热记忆效应显著降低。6.研究了马氏体、贝氏体和铁素体组织对HT 80钢消除应力开裂的影响。少