Reheating crack sensitivity evaluation method for improving calculation precision of percentage reduction of area

The invention discloses a reheat crack sensitivity evaluation method for improving the calculation precision of the percentage reduction of area, and belongs to the technical field of reheat crack sensitivity evaluation. An original sample is stretched after being subjected to a thermal simulation experiment, three-dimensional model data of the original sample and three-dimensional model data of the fractured sample are obtained through a three-dimensional scanner, the cross section area of the original sample and the cross section area of the fractured sample are calculated through software, and after the reduction of area of the sample is obtained, the reduction of area of the sample is calculated by combining a judgment standard. And judging the reheat crack sensitivity of the sample. According to the method, accurate judgment on the reheat crack sensitivity of the coarse grain area of the low-alloy heat-resistant steel can be realized through simple experimental equipment without depending on the experien