On final heat treatment after forging organization and performance

Forging production is metallurgy ( Raw materials) With intermediate between the final heat treatment process, so the forging quality of the final heat treatment and the quality of the parts after the use of performance has a great influence. Normal forgings organization after reasonable final heat treatment, can get the required by the organization and performance. However, due to improper forging process of some tissue defect or some defects of the legacy, raw materials has a great influence on the quality of heat treatment after forging. Is illustrated as follows: 1 some organization defects of forging, heat treatment after forging can improve, forgings in the end still can obtain satisfactory microstructure and mechanical properties after heat treatment. Such as: in general overheating of the structural steel forgings of coarse grain and westergren body organization, hypereutectoid steel and bearing steel caused by improper cooling slightly carbide network, etc. 2 some of the forgings organization defects, use normal heat treatment more difficult to eliminate, need high temperature normalizing, normalizing and low temperature decomposition over and over again, high temperature diffusion annealing and other measures to improve. Such as: low power coarse grain, 9 cr18 stainless steel twin carbide, etc. 3 some of the forgings organization defects, with general heat treatment process can't eliminate, final heat treatment after forging performance degradation as a result, even not qualified. Such as: severe rock fracture and the surface of the rib fracture, burnt, the ferritic stainless steel belt, carbide in ledeburite high alloy tool steel wire mesh, belt and so on. 4 some of the forgings organization defects, in the final heat treatment will be further developed, and even cause cracking. Such as: alloy structural steel forgings in the coarse grain structure, if not improved, when the heat treatment after forging in carbon, nitrogen and cause martensite after quenching is bulky and performance is unqualified; The banded carbide in high speed steel parts, quenching often cause craze.