EFFECT OF LOADING RATE AND TEMPERATURE ON DUCTILE-BRITTLE TRANSITION OF A CARBON STEEL

Acta Metall Sin

1990, Vol. 26

Issue (3): 44-49 DOI:

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EFFECT OF LOADING RATE AND TEMPERATURE ON DUCTILE-BRITTLE TRANSITION OF A CARBON STEEL

LIU Yongning;ZHU Jinhua;ZHOU Huijiu;A Kildegaard;J. A. Kristensen Department of Materials Science and Engineering; Xi'an Jiaotong University Department of Mechanical Engineering; Aalborg University; Denmark Department of Materials Science and Engineering;Xi'an Jiaotong University; Xi'an 710049

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Abstract The dynamic fracture toughness of a mild steel has been studied atdifferent loading rates and temperatures. The material exhibits a transition fromtough to brittle fracture with the changing of loading rate alone. Analysis of thefracture process by the theory of thermal activation suggests that the fracture activ-ation energy approximates the bond energy on the {100} plane of a unit cell. The tough-ness can be resolved into two parts, J_(Id)=J_a+J_t. where J_a is the athermal part, beingindependent on temperature and loading rate, while J_t=(K/K_0)~(1/″) exp (Q_f/nkT), whichcontrols the fracture process is temperature and loading rate dependent. the transi-tion of fracture mechanism caused by both temperature and loading rate is associatedwith the thermal movement of atoms.

Key words: mild steel brittle fracture transition loading rate temperature activation energy

Received: 18 March 1990

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