Numerical Simulation Based On The The Meso Anisotropic Shells (plastic) Theory Of Variable Temperature Martensite Phase Transformation

Martensitic transformation is one of the important means to improve themechanical properties of steel and iron. With people pursuing better material property,the research for the martensitic transformation becomes more and more deep,numerical simulation is one of the important methods for the research.The stress takes some effects on the martensitic transformation. For thetempeture-changed martensitic transformation,temperature stress is main origin of itsstess. Random distributions of grains(the anisotropy microstrucure) lead to that thestress field of grains can be different though the temperature field is the same, therebyso can distributions of the phase transformed units. In the present work, inconsideration of the random distributions of grains, on the basis of 0-1 phasetransformed model, by using thermal elastic and (plastic) finite element method,taking quenching treatment of a 45# thin,long,steel bar for example,we conductedon the simulation of the temperature-changed martensitic transformation.The calculation results show that,1.the random distributions of grains play animportant role in thermal stress, so it is essential to take it into account duringtransformation process. 2.with the time going on, temperature-changed martensitictransformation which is simulated in consideration of the anisotropy of themicrostructure roughly push on from outer layers to interior ones, but thetransformation of grains can be different though the temperature field is the same;andresidual austenite is distributed randomly.