Numerical Simulation on Comprehensive Strengthening Mechanism and Fatigue Crack Propagation of FH36 Ship Plate Steel by TMCP Process
In order to effectively master the comprehensive strengthening mechanism and fatigue crack propagation behavior of high-strength ship plate steel,FH36 steel after controlled rolling and cooling process was taken as the research object.EBSD,TEM and XRD were used to study the precipitation phase and texture of FH36,and the mechanical properties and fatigue crack propagation performance were tested.The contribution of each strengthening mechanism to the yield strength was calculated quantitatively and the residual fatigue life of FH36 ship plate steel was simulated by a new extended finite element method.The results show that the precipitated phase in FH36 steel is NaCl type(Ti,Nb)(C,N),and the main texture is{111}<123>,{331}<231>.The new algorithm for synthesizing the strengthening mechanism can be expressed quantitatively as the yield strength value is equal to the solution strengthening contribution value and precipitation strengthening value,and the arithmetic square root value of the sum of the squares of fine grain strengthening and dislocation strengthening.The theoretical yield strength value is in good agreement with the actual yield strength.Compared with the experimental results,the average error of the new numerical analysis results is 3.02%,which can effectively predict the residual fatigue life and evaluate the fatigue properties of FH36 steel.
FH36 steelstrengthening mechanismfatigue crack propagationnumerical analysisresidual fatigue life
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