| IN718 nickel-based superalloy has good corrosion resistance and high temperature wear resistance and is widely used in molds for various parts processing.It is widely used in various extrusion and stamping processes,which can better ensure products quality,but also ensure the surface finish of the product.Corrosion and wear can cause huge losses.Sometimes the damage to the alloy will not only cause a lot of economic losses but also cause serious damage to people.It needs to be paid great attention.In this paper,the die of the JY400 extruder of Jiangxi Guangxin New Materials Co.,Ltd.is selected to study the properties of IN718 nickel-based high temperature.On the one hand,the controlled variable method is used to study the effect of heat treatment and holding time on the properties of the alloy,and to analyze the service life of the alloy.Since the alloy,mold needs to be used repeatedly in production,heat preservation and preheating are required before each use.Therefore,tempering treatment was used to study the effect of tempering temperature on various properties of IN718 alloy,especially the wear resistance.Since the working conditions of the mold are high-temperature conditions,and it is difficult to achieve the conditions in the research,the conclusions are only for reference.On the other hand,in order to further provide production reference for the company,Deform simulation software is used to simulate the heat treatment process and stamping wear process of IN718 superalloy,and analyze the stress field,and temperature field and wear loss of the alloy.Through research and analysis,the results are as follows:(1)By studying the influence of heat treatment temperature and time on the properties of IN718 alloy,the results show that with the increase in temperature and time,the grains will become finer,and then increase again.The tensile strength and other mechanical properties are the best,the fractured texture is the clearest and most uniform,and the pores are few and small,which are intergranular fractures.The surface morphology was observed by scanning electron microscope and EDS analysis of the energy spectrum.It can be found that in the IN718 alloy after heat treatment,The Ni element in it will cause agglomeration,which has a great negative impact on the performance.Through 810 ℃,30 min treatment of IN718 alloy,the best corrosion resistance,corrosion weight increase of only 0.003 mg,corrosion mainly consumes Ti,Nb elements in the alloy.(2)Studying the tempering temperature of the IN718 alloy after heat treatment,it is found that the mechanical properties of the alloy will be lower than those before tempering,which is due to the removal of internal stress in the alloy.Through EDS analysis,it was found that the phase composition in the alloy did not change,but the shape of the grains would change.Increase the interface of the alloy,so the mechanical properties such as tensile strength of the alloy will decrease.Analysis of the wear surface morphology shows that the wear type of the IN718 alloy is a combination of oxidation wear,abrasive wear,and layered wear.The alloy wears at600 ℃ The factor is the smallest,the weight loss is the least,the wear curve changes uniformly,the wear particles are less,the delamination phenomenon is not obvious,and the performance is the best.(3)Through Deform simulation analysis,it is found that the temperature field and stress field distribution of the alloy is very uniform,and the best performance is at 810 ℃ for 30 minutes.At the same time,the wear analysis of the tempered group is carried out,and it is found that the wear amount of the alloy is the least at 600 ℃,which is Optimum wear resistance.This is consistent with the conclusions of the experimental characterization. |
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