Non-destructive testing method for LOF defects, and a testing standard part and manufacturing method therefor

A manufacturing method of a LOF defect standard part, used for non-destructive testing of LOF defects of an additive manufacturing workpiece, comprises:

• step A, setting a LOF defect area of the standard part, wherein in the LOF defect area, a proportion of the LOF defect area is occupied by LOF defects, wherein setting the LOF defect area of the standard part comprises setting, as a first proportion value, the proportion of the LOF defect area that is occupied by LOF defects, wherein step A further comprises setting a body area of the standard part, wherein the body area is free of LOF defects;
• step B, selecting an additive manufacturing forming process for manufacturing the LOF defect area to obtain a first process parameter of the additive manufacturing forming process corresponding to the first proportion value, and selecting another additive manufacturing forming process for manufacturing the body area to obtain a second process parameter of the another additive manufacturing forming process corresponding to the body area;
• and
• step C, performing the additive manufacturing forming process based on the first process parameter to form the LOF defect area, and performing the another additive manufacturing forming process based on the second process parameter to form the body area;
• wherein, the additive manufacturing forming process is a laser selective melting forming process, the material in the LOF defect area is Hastelloy X alloy, the first proportion value is 0.4%-5.7%, the first process parameter comprises:
• a first laser linear energy density of 66 J/m-113 J/m, a first scanning spacing of 0.10 mm-0.12 mm, a first strip width of 7 mm-10 mm, a first strip overlap of 0. mm-0.05 mm, and a first paving powder thickness of 0.02 mm-0.03 mm, the first laser linear energy density is determined by the following formula:
• a
• =
• 753.27
• e
• -
• η
• 13.4
• +
• 0.19
• wherein a is the first proportion value, and n is the first laser linear energy density.