Analysis of High Temperature Tensile Fracture Behavior of As-cast 42CrMo Steel Based on Stress Triaxiality
The as-cast 42CrMo steel notch samples with different notch radiuses(0.5,1.0,2.0,4.0 mm)were subjected to thermal tensile tests at different temperatures(1 223,1 273,1 373 K)with Gleeble-3500 thermal simulator.The tensile fracture behavior at high temperature was analyzed based on stress triaxiality.The results show that the flow stress of the notched sample at relatively high temperature was relatively small.With the decrease of notch radiuses,the flow stress and peak stress increased,and the fracture strain decreased.When notch radiuses were 0.5 and 1.0 mm,the maximum stress triaxial degree shifted to the center of the minimum cross section.When notch radiuses were 2.0 and 4.0 mm,it was always located in the stress triaxial at the center of the minimum cross section during tension was the largest.With the increase of notch radiuses,the stress triaxial value decreased.The average grain size of the fracture structure of the sample increased from 1 223 K to 1 373 K.When notch radiuses increased from 0.5 mm to 4.0 mm,the average grain size increased,microvoidage appeared and the size and area fraction increased.
as-cast 42CrMo steelstress triaxialityhigh temperature tensilefraction behavior
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