Residual Stress Measurement of Laser-Engineered Net Shaping AISI 410 Thin Plates Using Neutron Diffraction
Residual Stress Measurement of Laser-Engineered Net Shaping AISI 410 Thin Plates Using Neutron Diffraction
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DOI：
10.1007/s11661-008-9660-9
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发表时间：
2008-10
期刊：
影响因子：
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通讯作者：
P. Pratt;S. Felicelli;L. Wang;C. Hubbard
中科院分区：
文献类型：
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作者：
P. Pratt;S. Felicelli;L. Wang;C. Hubbard
为了将激光工程净成形 (LENS) 工艺参数、激光功率和激光行进速度与 LENS 生产的零件的质量联系起来，使用中子衍射方法在七个 LENS AISI 410 薄板内的几个预定点进行了应变测量。然后使用测量的应变值计算这些点的残余应力，以确定内应力如何随输入参数和位置变化。研究发现，垂直方向（即垂直于激光/粉末喷嘴的光栅方向）上的应力分量占主导地位，这与之前的报道一致，并且对工艺参数的变化相对不敏感。使用商业程序 SYSWELD 开发的热机械模型进行的数值模拟证实了这一点。模拟还显示出与测量的模拟应力具有良好的定性一致性。
In an attempt to relate the laser-engineered net shaping (LENS) process parameters, laser power and laser travel speed, to the quality of LENS-produced parts, strain measurements were taken at several predetermined points within seven LENS AISI 410 thin plates using the neutron diffraction method. The residual stresses at these points were then calculated using the measured strain values to ascertain how the internal stress varies as a function of the input parameters and location. It is found that the component of the stress in the vertical direction (i.e., perpendicular to the raster direction of the laser/powder nozzle) is dominant, in agreement with previous reports, and relatively insensitive to variations in process parameters. This was confirmed with numerical simulations performed with a thermomechanical model developed using the commercial program SYSWELD. The simulations also showed a good qualitative agreement with the measured simulated stresses.