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采用激光沉积修复方法对TC4槽损伤和面损伤试样进行了修复试验,观察了修复试样的组织和拉伸性能特点,发现修复区与基材之间形成了致密冶金结合,激光修复试样组织是由基材的双态组织经由热影响区过渡到修复区的魏氏组织。修复区组织由粗大原始β柱状晶粒及晶内细长的α针及编织细密的α+β板条组织组成。对槽修复试样进行维氏硬度测量发现,激光修复区的硬度比锻件基体区高15%,热影响区的硬度居于二者之间。修复试样的室温静拉伸结果表明,试样的抗拉强度高于同批次的工业锻件水平,但是塑性低于锻件水平。
The laser deposition repair method was used to repair the TC4 groove damage and surface damage samples. The microstructure and tensile properties of the repaired samples were observed. It was found that the metallurgical bond between the repair area and the substrate was dense and the laser repaired sample Tissue is a matrix of bimodal tissue through the heat-affected zone transition to the repair zone Widmanstatten organization. The repair area is composed of coarse primary β-columnar grains and elongated α-stitches in the crystal and fine braided α + β laths. Vickers hardness measurement of the groove repair specimen showed that the hardness of the laser repair area was 15% higher than the forging base area, and the hardness of the heat-affected zone was in between. Tensile tests at room temperature showed that the tensile strength of specimens was higher than that of industrial forgings in the same batch, but the plasticity was lower than forgings.