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通过改变工艺参数,用2.5kWRS2000SM快轴流CO2激光器的激光束对球墨铸铁板条进行扫描;并以X-350A型X射线应力测定仪,HVS-1000显微硬度测试仪及扫描电镜(SEM)等为工具,研究了脆性材料激光热应力成形的规律。结果表明,激光束能量较高、扫描速度较低、扫描次数较多和板材厚度较小时都有利于显著增加弯曲变形。成形后的试样在变形区表层有铁素体、渗碳体产生,试样内部表层的石墨团数量减少,试样上表层的最大残余拉应力在250MPa左右,试样下表层的残余应力值接近零。试样断面硬度在700～200HV之间变化,上表层硬度最高。激光束能量较大时,变形区内部产生了微裂纹。
By changing the process parameters, the ductile iron slab was scanned with laser beam of 2.5kW RS2000SM fast-flow CO2 laser. The X-350A X-ray stress tester, HVS-1000 microhardness tester and SEM As a tool, the law of laser thermal stress forming of brittle materials was studied. The results show that laser beam energy is higher, the scanning speed is lower, the number of scanning is more and the thickness of the plate is small, which is beneficial to significantly increase the bending deformation. The formed sample has ferrite and cementite on the surface of the deformation zone. The number of graphite clusters in the inner surface of the sample decreases. The maximum residual tensile stress of the upper surface of the sample is about 250 MPa. The residual stress of the lower surface of the sample Near zero. Specimen section hardness changes between 700 ~ 200HV, the highest surface hardness. When the energy of the laser beam is large, microcracks are generated inside the deformation zone.