Here refers to the metal material heating is the bad material heating before forging, not to the heat treatment of forging.
The purpose of metal material heating before forging and die forging is to improve metal plasticity and reduce deformation resistance, so as to facilitate metal deformation and obtain good metallographic structure after forging. Therefore, metal material heating plays an important role in forging forming, and it is an indispensable important process for warm and hot forging process. The quality of metal billet heating directly affects forging forming and forging internal quality, metal billet heating process to consume a lot of heat energy, so in the formulation of heating specifications must also consider how to save energy, and take measures to reduce energy consumption.
Therefore, the heating of metal should first ensure that the heating temperature and quality of the bad material of the bureau is the best, so as to meet the requirements of the metallographic structure, mechanical properties and production rhythm after forging. In addition, it should be less reliable, low cost and environmental protection.
Steel bad when heated, the austenitic grain size will be raised significantly, forming after cooling to room overflow well mount is a bulky austenitic grain size change and get bulky pearlite and network ferrite, hypoeutectoid steel will be rent one block ferrite pearlite and layer H shape, which have folded lamellar pearlite steel will get carbide network and layer. The mechanical properties of this kind of metallographic structure are very poor, and can not be used directly. It must be used by improving the metallographic structure of forgings and improving their mechanical properties after a hot place.
this is real forging pictures of tongxin precision forging company