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| INFLUENCE OF QUENCHING TEMPERATURE ON STRESS CORROSION IN 4330M STEEL——The Role of Impurity Segregation in Stress Corrosion Cracking of High Strength Steel |
| LIN Dongliang (T. L. Lin); WU Jiansheng (Shanghai Jiaotong University) (Manuscript received 7 August; 1982) |
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Cite this article:
LIN Dongliang (T. L. Lin); WU Jiansheng (Shanghai Jiaotong University) (Manuscript received 7 August; 1982). INFLUENCE OF QUENCHING TEMPERATURE ON STRESS CORROSION IN 4330M STEEL——The Role of Impurity Segregation in Stress Corrosion Cracking of High Strength Steel. Acta Metall Sin, 1984, 20(1): 62-152.
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Abstract The effect of quenching temperatures on the rate of stress corrosion crack propagation of 4330M steel in distilled water has been investigated. The rate of crack propagation, da/dt, decreased rapidly as the increase of quenching temperature in the range of 870—1100℃, while increased slightly from 1100 to 1200℃. The fracture mode changed from intergranular separation along prior austenite grain boundary in the specimens quenching at 870 and 1000℃ to transgranular quasicleavage in that quenching at 1100℃ and 1200℃. The segregation concentration of P at prior austenite grain boundaries has been measured with selective etching and found to be related to quenching temperature fitting McLean's theory of equilibrium segregation. The change of propagation rate with quenching temperature was found to be mainly due to the P segregation at prior austenite grain boundaries and can be rationalized with an interactional effect between H_2 and grain boundary P segregation. It is concluded that stress corrosion cracking of 4330M steel without grain boundary impurity segregation in distilled water is transgranular,while intergranular cracking is a result of impurity segregation at the grain boundraies.
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Received: 18 January 1984
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