Research On Microstructure Property And Numerical Simulation Of Reverse Domed Metallic Rupture Discs

With the improvement of productivity development level,the energy industry,petrochemical industry,military industry rapid development,play an increasingly important role of pressure vessel,but,in the event of overpressure and do not take effective means of discharge pressure,will be a serious threat to people’s life and property security,in a variety of overpressure discharge device,blasting piece to relief area is large,the advantages of high sensitivity,no leakage,become the most widely used overpressure discharge device,frequently during blasting piece in service under cyclic loading,so the rupture disc movement performance under repeated loading is necessary.Therefore,in this paper,the fatigue test of blasting after performance of microstructure evolution has carried on the thorough research,to ensure demolition blasting with stable performance and safe use is of great significance.Based on the 316 1 for long tube trailer back arched rupture disk as the research object,to meet the requirements of GB-16918-1997 at room temperature fatigue test,the blasting test,the test results show that the fatigue test of blasting in the process of doing blasting experiment,burst pressure increases with the increase of cyclic time,significantly more than the allowable value.To explore the causes of this phenomenon,this paper introduced the MVH-1000X super depth of field and microscopic observations experiment,metallographic analysis,EBSD analysis,EDS analysis,XRD analysis,microhardness measurement experiment and ANSYS Workbench software platform for the cumulative effect of plastic deformation and residual life prediction problems,such as the finite element analysis.Blasting experiment obtained results are as follows:(1)The arch piece in the process of fatigue test obvious changes have taken place in shape,size,cyclic times to 18000 times,high arch reduced about 0.3mm,verify the existence of plastic deformation;(2)After the fatigue test,plastic deformation can be observed,twin quantity increased obviously,part of elongated grains after fragmentation,form the fine grain strengthening,improve the strength and hardness of rupture disc;(3)After fatigue test,austenitic matrix grain does not occur martensitic transformation,the change of the blasting performance has nothing to do with martensite phase transformation;(4)After fatigue test,due to plastic deformation,material internal dislocation tangles occur while a movement of obstruct the movement of dislocation,the strain hardening,influence the tensile strength,thus improve the burst pressure;(5)Through the finite element analysis,it is concluded that in the process of loading of blasting stress concentration area,arch highness,V-shape groove angle,V-shape groove depth and transition arc radius of blasting the influence of the fatigue life.In this paper,the research work is of important engineering practical value,to discuss specific thickness to diameter ratio of the arch blasting can guarantee the stability of the blasting performance after fatigue test provides an important theoretical basis,to ensure that the batch of blasting safety use is of great significance.