Numerical Study of Hot Isostatic Pressing with Integrated Heat Treatment of PM-HIP Cold Work Steel D7
Following the development of the rapid cooling technology,it is now possible to carry out the Hot Isostatic Pressing(HIP)followed by the process of Integrated Heat Treatment(IHT)in a single pressure vessel.This combined HIP-IHT process can not only densify and cool the components to achieve desired material properties(hardness and strength)in a single step process,but also save both time and energy compared with the conventional processes.Even with these attractive advantages,it still requires the numerical modelling to facilitate the production of the near-net-shape(NNS)components as well as to further reduce the machining costs.Due to the unavoidable distortion of the final component shape after HIP-IHT,both the accurate prediction of the shape changes during HIP-IHT and the optimal design of the initial capsule geometry are essential.In this work,the former and the latter were achieved by the development of a finite element(FE)model and an “Invert Optimization tool,respectively.The FE-model was generated to simulate the densification of the encapsulated powder during the holding stage and the phase transformation during cooling.Cold work steel D7 powder encapsulated in capsules made of SS304 was simulated.The consistent final microstructures of the simulated and experimental components validated the accuracy of the FE-model.Following this,an initial capsule geometry was also re-designed by the “Invert Optimization tool to realize the objective NNS component geometry,which confirms the reliability of the here developed optimization tool.In a word,both modeling methods should help to effectively reduce the expensive prototype tests for machining and in turn save numerous resources.
Hot Isostatic Pressing with Integrated Heat Treatment (HIP-IHT) Rapid cooling cold work steel D7 Capsule design
Deng Yuanbin Birke Carola Rajaei Ali Kaletsch Anke Broeckmann Christoph
IWM RWTH Aachen University,Augustinerbach 4,Aachen,52062,Germany IAPK e.V.an der RWTH Aachen University,Augustinerbach 4,Aachen,52062,Germany
国际会议
北京
英文
442-453
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）