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一概述制造压力容器用的16MnR试件,板材厚30mm。为进行工艺评定,用J507焊条进行双面焊接。焊接后,焊件经X射线照相分析,合格后作机械性能试验。取拉伸试样A、B两块,以较缓慢的速度进行拉伸试验,拉断后的断口中均发现有银白色的斑点。为了搞清白点的存在原因,作了如下的试验。二断口宏观分析观察拉伸断口发现在A试样的断口上存在圆形的银白色斑点,其直径分别为4mm、3mm、2.5mm;在B试样的断口上发现椭圆形的银白色斑点,其长轴
An overview of the manufacture of 16MnR pressure vessel specimens, plate thickness 30mm. For process qualification, double-sided welding with J507 electrode. After welding, the weldment by X-ray photography analysis, mechanical properties after passing the test. Tensile specimens A and B were taken and subjected to a tensile test at a slower rate. Silver-white spots were found in the fractured fracture. In order to understand the existence of white spots, made the following test. Second, the macroscopical analysis of the fracture surface shows that there are round silver-white spots on the fracture surface of specimen A, the diameters of which are 4mm, 3mm and 2.5mm, respectively. Oval silver-white spots are found on the fracture surface of specimen B, Its long axis