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Surface hardening process refers to make surface hardening of investment castings,but the core still have strong toughness.Through this process,we can improve the wear resistance and fatigue resistance of investment castings.As the core still has good toughness and strength,so investment castings after case hardening have good resistance to impact load.Surface hardening treatment methods mainly include carburizing&quenching, nitriding, hard anodic oxidation, chrome plated, and metallic cementation, etc.
Carburizing and quenching is a common heat treatment process,After carburizing,the surface of investment castings could obtain high hardness,Thusimprove its wear-resisting degree.Traditional process mainly include:the low temperature tempering,direct quenching after cooling,first heating quenching,carburizing and high temperature tempering,secondary hardening after cold treatment,carburizing and induction heating,etc.Most important parts,espcially in the application of automobile,airplane,ect are all required to do this process.To meet the technical requirements of various parts,quenching is developed.
Impeller investment casting parts are typical investment castings.Common material of such parts are stainless steel.There are high quality requirements for casting quality,machining,dimension accuracy and surface roughness.Below are some aspects that the effect of impeller investment castings structure on casting quality:
Investment castings are easy to be deformed during production process.We can divide the deformation into self micro-deformation,flaring deformation and warping deformation.
Currently,technology is still the biggest problem of investment casting industry in our country.Although we are always winning good reputation from overseas investment casting specialists,there are still some bad influence for the lack of technology.So if we want to enlarge investment casting market,we must improve talents' innovative ability.
