Microscopic characteristics of hardened steel with quenching cracks

In the previous article, we on the microscopic characteristics of hardened steel with crack is introduced in detail, today we will from another aspect to introduce the quenching crack problem, hope to be able to solve all doubts and problems, help the steel belt manufacturer and you have a product needs of customers to solve doubts. From the micro perspective, the quenching crack is along the austenite grain boundary and extension, on both sides of the crack, crack, there will be some small these cracks usually present a zigzag shape, the bigger the grain is the crack propagation, the greater the stress of the parts is too large, transgranular fracture. In general, the quenching crack is caused by improper heat treatment process parameters of the quenching process, in addition, the components of the raw materials of chemical composition segregation, high hardenability, the presence of large amounts of non-metallic inclusions, the coarse grain, etc. , can increase the parts quenching crack trend. Visible hardened steel with the quenching crack is not caused by single factor, so should be concrete analysis to quenching crack problems, manufacturers in the heat treatment process and tempering steel belt need to heat treatment process parameters of the steel belt and deliberate, temperature and so on in detail, to avoid the happening of the problem. A: on hardened steel with quenching cracks under the macroscopic characteristics of a: the steel strip surface protection