Experimental Simulation Of Heat Treatment Process After Forging Of Stainless Steel And Microstructure Calculation

Heat treatment is not only a crux working procedure in the process of producing machine accessory, tool and mould, but also one important basic technology in mechanical industry. It takes on an very crucial signification in improving and controlling performance of materials, exerting performance potential of materials adequately, economizing material, reducing energy exhaust, enhancing dependability of product, longing useful life of product, advancing economic efficiency of production units, etc.Due to its excellent anticorrosion ability, mechanical property at room temperature and nicer intension and processing property at moderate temperature, stainless steel has been applied widely in such industry as oil, chemistry, power machinery and aviation, etc. Especially, those accessory which endure not big forces, tasking in moderate condition and having upper need of anticorrosion ability, are mostly produced in kinds of stainless steel.Anticorrosion ability of stainless steel is also determined by microstructure and distributing of inner stress besides its chemical composition. By using proper heat treatment process, not only structure shape and properties of physical and mechanics of stainless steel can be changed, but state of inner stress can be improved, importantly, its anticorrosion ability can be increased or resumed.In this dissertation, research object is certain trademark stainless steel used in aviation. Aiming at existent problems in its engineering use, heat treatment process after forging of this material has been studied by using a method of perpendicular experiment combined with property test and analysis of metallographic structure, moreover, rules of distribution and variety of transient temperature field and heat tress field during quenching process have been analysed and studied by using finite element numerical simulation software. The obtained research findings and new outlooks are as follows:(1) Appropriate technical process of heat treatment after forging of researched material has been given and rational technical parameter has been preferentially selected;(2) A kind of calculating model of structure and property of researched material after postforging heat treatment, which is based on experiment results, has been established and corresponding forecasting software has been programmed;(3) TTT curve of studied material has been regressed and corresponding computer describing mode has been presented, which consequently provided a mathematical model for structure calculation of this material;(4) By using finite element numerical simulation software, rules of effect of different cooling media to temperature field and stress field during quenching of studied material have been analysed and researched, distribution of temperature field and residual stress field during quenching have been obtained.