Hot working:
Maraging steel has good thermoplasticity at high temperature, and its hot workability is roughly the same as that of 1Crl8Ni9Ti. For the steel with high content of titanium and molybdenum, the microsegregation of these elements is easy to occur during ingot solidification, and the anisotropic banded microstructure is formed after hot processing. The effective measure to reduce or eliminate microsegregation is to select appropriate ingot size and conduct sufficient high-temperature homogenization treatment during hot working. In order to prevent the high temperature slow cooling brittleness caused by the precipitation of Ti (C, N) and other compounds along the austenite grain boundary, the slow cooling or staying of the workpiece in the temperature range of 1100~750C should be avoided as far as possible after hot processing. In order to obtain fine grains and better mechanical properties, the final forging should be completed at a relatively low temperature (950~850C) with a large amount of deformation (more than 25%).
Cold working:
The cold workability is very good in the solution state. Drawing, cold rolling, bending, deep drawing and other processing are easy to carry out. The work hardening index of steel is 0.02~0.03, which is one order of magnitude lower than that of ordinary steel. Therefore, no softening annealing is required during the processing process to carry out cold processing with more than 90% deformation.
Welding:
Good weldability is one of the advantages of maraging steel. Almost all welding processes can be applied. The composition of the welding wire is basically the same as that of the welded steel. There is no need to preheat before welding, and no crack will occur without treatment after welding. After direct aging, the joint coefficient can exceed 90%.
