Common defects of forgings after heat treatment

Raisingelec can make any metal products.In the heat treatment of forgings, it is necessary to meet the performance requirements of the parts in the process of use, otherwise there will be many defects, so that the forgings cannot be used normally. In order to better understand the use of forgings, China Standard Parts Network talks about some defects that may occur after heat treatment of forgings.

1. Microstructure defects that can be improved: coarse grains and Widmancer structures in general overheated structural steel forgings, slight network carbides caused by improper cooling of hypereutectoid steel and bearing steel, etc. during post-forging heat treatment processing , Satisfactory structure and properties can still be obtained after forging heat treatment.

2. Unimprovable structural defects: austenitic and ferritic heat-resistant stainless steels, superalloys, aluminum alloys, magnesium alloys, etc., have no allotropic transformation during heating and cooling, as well as some copper alloys and titanium alloys. For alloys, etc., the structural defects generated during the forging process cannot be improved by heat treatment.

3. Microstructure defects that cannot be eliminated by the general heat treatment process: severe stone fractures and facet fractures, over-burning, ferrite strips in stainless steel, carbide meshes and strips in ledeburite tool steel, etc. The performance of the processed forgings is degraded or even unqualified.

4. If the heating is improper, for example, the heating temperature is too high and the heating time is too long, it will cause defects such as decarburization, overheating, and overburning.

5. The structural defects that are difficult to be eliminated by normal heat treatment processing: such as low-magnification coarse grains, 9Cr18 stainless steel, H13 twin carbides, etc., can be improved by measures such as high-temperature normalizing, repeated normalizing, low-temperature decomposition, and high-temperature diffusion annealing. .

Post time: Jun-22-2022