Research On The Determination Of The Charpy Impact Energy Of Pressure Vessel Steels By The Spherical Indentation Test

With the development of the world economy,the demand for materials has increased dramatically and the awareness of environmental protection has increased day by day.In addition to the world energy crisis,the design and management of modern process industry must comply with the principles of economy and sustainable development as far as possible.This has led to the development of high-temperature and high-pressure technology and large-scale equipment in petroleum,chemical and energy processing industries.At the same time,the safety and reliability of the equipment are also put forward higher requirements.As a widely used and focused mechanical property index,impact energy plays an important role in the safe operation of equipment.However,traditional test methods need destructive sampling of equipment,which can not be applied to serving equipment,and can only be used as a test method after the accident occurs.And the existing calculation methods also need more complex material parameters as the basis of calculation.This leads to the limitation of the further effective application of impact energy.Therefore,it has become the focus of many researchers to study a method which can be applied to online detection of impact energy of service equipment.In order to solve this problem,the author has carried out a spherical indentation test to calculate the impact energy of steel for pressure vessels.The method has been tested and simulated.The specific work is as follows:1.The common pressure vessel steels SA508-3,SA516Gr70,30408,18MnMoNbR and Q345R were tested for indentation,dynamic tension,Charpy impact and impact crack arrest.2.Combining the physical nature of material damage in indentation,rapid tension and impact tests,the relationship between them is explored.3.Establish a method for predicting the impact energy of metal materials by spherical indentation tests4.The above forecasting methods are validated by experiments and simulation methods,and the effectiveness of this method is proved.The error of it can be less than 11%.