Study on the Influence of Selective Laser Melting Process on the Laser Welding Cracking of GH3230 Alloy
GH3230 nickel based superalloy was prepared by Selective Laser Melting(SLM).The influence of process parameters on the laser welding cracking of GH3230 nickel based superalloy was studied.The experimental results showed that with the increase of scanning distance from 0.05 mm to 0.09 mm,the average size of carbides precipitated from the base material increased,the grain size of the base material decreased obviously,and the grain boundary angle shifted to the right,the obtained grain boundary angle distribution became more uniform.After laser welding,due to the influence of genetic effect,the grain at the weld decreased with the increase of scanning spacing,the grain boundary angle distribution became more uniform,and the overall crack resistance was improved.The total length and maximum length of cracks in the weld were gradually reduced,and the number of cracks was gradually reduced.The results showed that when the scanning interval is 0.09mm,the formed alloy sample had the best cracking resistance under various welding conditions.
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