金属材料内部缺陷试块的热压扩散连接制备方法

Preparation method of hot-pressing diffusion bonding for internal defect test block of metal materials

针对空腔类缺陷的人工模拟无损检测试块的研制,提出热压扩散连接技术的制备方法。利用热压扩散连接方法,制备内部含有三种不同规格尺寸人工模拟缺陷的试块。分析结果表明,试块连接区域熔合较好,熔合线难以区分;基体组织未发生明显变化;试块内缺陷尺寸发生变化且呈现一定变化规律,变形率与缺陷边界夹角和缺陷所呈角度大小有关。试块宏观尺寸呈现一定的形变,无损检测及金相分析结果显示人工缺陷边界清晰,基体连接区域扩散连接充分且组织无有害缺陷。热压扩散连接法应用于空腔类缺陷的人工模拟无损检测试块的研制工作具有可行性。

For the development of NDT simulated test blocks with cavity defects,the preparation method of hotpressing diffusion bonding technique was proposed.Using the hot-pressing diffusion bonding method,a test block containing artificially simulated defects of three different sizes was prepared.The analysis results show that the connection area of the test block was fused well,and the fusion line was difficult to distinguish.There was no obvious change in the matrix structure.The size of the defects changed and show a certain change rule.The deformation rate was related to the angle between the defect boundary and the angle of the defect.The macroscopic size of the test block show a certain degree of deformation.The results of non-destructive testing and metallographic analysis show that the boundaries of artificial defects were clear,the matrix connection area was fully diffused and the structure was free of harmful defects.It is feasible to apply the hot-pressing diffusion bonding method to the development of non-destructive testing simulated test blocks with cavity defects.