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INVESTIGATION OF CRACK GROWTH BEHAVIORS OF MEDIUMMANGANESE CAST STEEL

Han Wenzheng,Ma Lili,Zhang Ping,Jiang Houwen,Yu Yuanhong  
Compact Tension Method (CT test) was used to investigate the crack growth behavior of a medium manganese cast steel and accordingly a regression expression for crack growth rate is obtained based on the test data.SEM and Microzone Phase Structure Analysis (MPSA) help to describe the process of fatigue crack growth of the steel.The result shows that the transformation plasticity produced at the crack tip during the strain induced transformation from austenite to martensite lowers the crack growth rate.
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