Heat treatment is an important process method to obtain the service performance of casting parts to meet the needs of working conditions through heating and cooling, so as to give full play to the potential of materials, improve the service life and efficiency of products. If there are heat treatment defects, the heat treatment of casting parts can not achieve the expected purpose, and the casting parts will become unqualified or scrap, resulting in economic losses. Heat treatment defects of casting parts are generally classified according to the nature of defects, mainly including crack, deformation, residual stress, unqualified structure, unqualified performance, brittleness and other defects. The most dangerous heat treatment defect of casting parts is crack, which is generally called the first type of heat treatment defect of casting parts, which belongs to irreparable defect; The most common heat treatment defect of casting parts is deformation, which is generally called the second type of heat treatment defect of casting parts; Other defects such as residual stress and unqualified structure belong to the third category, which is generally referred to as the third category of heat treatment defects of casting parts. The following focuses on the heat treatment of cast parts. The first type of heat treatment defect of casting parts – crack.
There are many kinds of defects in heat treatment of casting parts, and the causes are various. The causes of defects in heat treatment of casting parts may include improper process, improper operation, improper equipment and environmental conditions, etc. Therefore, in order to prevent the occurrence of heat treatment defects of casting parts, we should solve it from many aspects related to heat treatment of casting parts, and control all relevant links before, during and after heat treatment, which is to carry out comprehensive quality control over the whole process of heat treatment of casting parts. In addition, we should strengthen the research on the heat treatment defects of casting parts, deeply study the mechanism of various heat treatment defects and the heat treatment process defects of new casting parts, and explore new measures and remedies to reduce and avoid the heat treatment defects of casting parts.