基本信息
项目批准号：51505293
申请代码：E0508
项目名称：搅拌摩擦修复/改性对铝合金深冷设备焊接结构完整性的影响机理
项目负责人：李博
依托单位：上海市特种设备监督检验技术研究院
研究期限：2016-01-01 至 2018-12-31
资助经费：20.0（万元）

项目摘要
中文摘要：
从结构完整性命题出发，基于搅拌摩擦加工技术提出对深冷特种设备用5083铝合金的熔焊缝进行搅拌摩擦修复/改性，重点研究冶金缺陷演化、焊态组织演变、焊缝尺寸改变对低温条件下焊接结构完整性的影响机理。探明不同类型熔焊冶金缺陷在搅拌摩擦修复中的愈合路径、演化模式及其与搅拌区组织演变的行为联系；建立搅拌摩擦修复/改性熔焊缝结构低温完整性评价体系，从微结构对裂纹损伤的抑制作用和延寿视角，揭示修复/改性产生的新组织结构对裂纹损伤扩展的阻滞机制模型，建立“缺陷愈合/组织演变→低温机械性能响应及损伤演变与失效→低温焊接结构完整性”关系桥梁；开展对搅拌摩擦修复/改性熔焊缝的容器/管道结构应力应变有限元计算分析，结合关键性能测试数据，研究搅拌摩擦修复/改性的深冷设备在低温承压、承载条件下的综合性能评估方法。本研究可为加快推动搅拌摩擦加工新工艺在特种设备制造领域及其监督检验、安全评价环节的应用奠定重要的科学基础。
英文摘要：
The proposal will be started to be conducted from the structural integrity proposition. On the basis of friction stir processing technology, the weld of 5083 aluminum alloy in cryogenic equipment will be processed via friction stir repair / modification. It will be focused of the effect mechanisms of metallurgical weld-defects and weld-microstructure evolutions, and weld size changes on the welding structural integrity under low temperature condition. The healing path, evolution model and the relationship with the microstructure evolution behavior via friction stir repair of different-typed welding metallurgy defects will be investigated. It will be established of low-temperature structure integrity assessment system of friction stir weld repair / modification structures, from the perspective of the inhibitation to crack damage and service life extension by the newly formed microstructure. In addition, the crack-inhibitation mechanism will be researched for the relationship establishment of "defect healing / microstructure evolution → mechanical properties response at low temperature, damage evolution and failure → low temperature welding structure integrity". It will be performed of stress and strain finite element analysis on the container / pipeline structure with friction stir repair / modification welds, combined with the key performance test data, to research on properies evaluation method of cryogenic equipment processed via friction stir repair / modification at low temperature. The research can accelerate the application proceed of the new process, friction stir repair / modification, in the manufacturing field of special equipment. Meanwhile, in the application aspects of supervision and inspection, safety evaluation of special equipment will be layed important scientific foundation through the study in this proposal.
                                                                                                                                                                 ——来自https://kd.nsfc.gov.cn/