Fracture Mechanism of TRIP1000 Steel Containing Aluminum

ZHOU Lei,HUANG Shu,FU Renyu,ZHANG Mei,LI Lin

Journal of Iron and Steel Research ›› 2011, Vol. 23 ›› Issue (05) : 29-33.

Journal of Iron and Steel Research ›› 2011, Vol. 23 ›› Issue (05) : 29-33.

Fracture Mechanism of TRIP1000 Steel Containing Aluminum

  • ZHOU Lei,HUANG Shu,FU Renyu,ZHANG Mei,LI Lin
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Abstract

Intercritical annealing and isothermal treatment in bainite region were carried out to obtain the strength 1000MPa and the elongation 234% TRIP steel with low silicon containing aluminum. The fracture mechanism of experimental steel after heat treatment were studied through insitu tensile test and EDX. Experiments show that under tensile stress, the dislocations dislocation move along the slip bands to cause grain boundary dislocations block which caused by stress concentration, while microinitiation holes formed because the adhesive force between ferrite and the surrounding hard phase is relatively weak. With increasing stress, small holes are created, gather, grow and finally become a crack that crossed ferrite grain. When the crack meets the hard phase bainite, it spreads along the edge of the bainite. When a crack meets the retained austenite, concentrated stress around the trip of crack makes retained austenite phase transform to martensite. This is called TRIP effect. The crack changes its direction then goes until fracture. Fracture morphology of the TRIP steel is a dimple pattern with features of plastic fracture.

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ZHOU Lei,HUANG Shu,FU Renyu,ZHANG Mei,LI Lin. Fracture Mechanism of TRIP1000 Steel Containing Aluminum[J]. Journal of Iron and Steel Research, 2011, 23(05): 29-33

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