激光弯曲机理的试验研究

通过对试件在激光与材料非熔凝作用下动态变形过程的实时测量及光斑中心处横截面的金相分析,得知激光弯曲变形是热应变和相变共同作用的结果.试验结果表明:激光弯曲变形的大小和方向取决于材料吸收的能量、材料特性和材料的厚度,并给出了这些影响因素的变化规律.研究结果进一步完善了激光弯曲的变形机理,并为进一步研究激光弯曲过程奠定了基础.

Experimental Research on Laser Bending Mechanism

The deformation of laser bending is identified to be a result of the thermal strain and phase transformation strain through real-time measuring the dynamic micro-deformation of the specimen and microstructure analysis in the cross section of heated region center under the condition of laser-material non-melting interaction. Laser bending mechanism is described as Temperature Gradient Mechanism. When the temperature gradient is enough small, the thinner specimen produces the buckling due to lost steady state and the thicker specimen produces the upsetting due to compressed in the heated zone. Experimental results show that the deformation extent and direction of the specimen depend on the energy absorbed by the specimen, the composition peculiarity of the specimen and the specimen thickness, and give that influence factors vary with the laser bending deformation. The conclusion reveals the mechanism of laser bending and lays a foundation of research on the process of laser bending further.