零件表面裂纹激光修复的热物理过程及其数理模型研究

The research was mainly involved exploring the proper technological conditions of remelting of substrate and repairing the surface crack with two bundle of laser , investigateing the heat physical process of each factor's reciprocity and then establishing the corresponding mathematical models，examining the microstructure and capability of the repaired region, settling reliable technical and academic foundation of repairing cancellation components.The experimental results show that the surface crack with the width of 0.1－0.2mm could be repaired under the laser power of 3.5kW and the scanning speed of 5mm/s.The component is steel 30# and the repaired deepness is 7mm.Scanning the repaired region shows that the hardness decreases gradually from the filled layer to joined zone. This technics has been used in repairing vane's pore，crevasse and surface crack.It was already published 7 dissertations; joined international and domestic seminars, respectively,twice; empoldered the software system of HWRX-3 thermovision independently; cultivated 5 students. Crack's outline self-adapting system is being opened out for more practical apply

研究多光束激光基材重熔和送料堆焊填充修复表面裂纹的工艺优化条件，各因素间交互作用的热物理过程，建立温度、成分、焓平衡方程数理模型；检测激光修复区的组织与性能；为表面裂纹等伤残零件修复奠定可靠的工艺和理论基础。该技术的研究成果，将广泛应用于修复材料疲劳裂纹、铸件凝固裂纹等大量失效报废零件，其意义重大。