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| FATIGUE FRACTURE BEHAVIOUR OF LOWCARBON MARTENSITE AND MARTENSITE/ BAINITE DUPLEX STRUCTURE IN 20CrMnMo STEEL |
| LI Yongjun Xi'an Jiaotong University |
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Cite this article:
LI Yongjun Xi'an Jiaotong University. FATIGUE FRACTURE BEHAVIOUR OF LOWCARBON MARTENSITE AND MARTENSITE/ BAINITE DUPLEX STRUCTURE IN 20CrMnMo STEEL. Acta Metall Sin, 1991, 27(6): 70-75.
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Abstract Fatigue crack propagation rate, d~α/d~N, and threshold stress intensity range, ΔK_(th), of 20CrMnMo steel coniaining low carbon martensite or low carbon martensite/bainite (LCM/B) duplex structure, obtained by O. Q. and austempered at 360℃,have been meaured using specimens under four-point bending. Observation was also made of the crack path and fracture morphology with relation to microstructure. The formation of LCM/B duplex structure, which caused by 20％ lower bainite after shorttime isothermal treatment, may remarkably increase ΔK_(th) and considerably decrease d~α/d~N. The effect of microstructure on d~α/d~N and ΔK_(th) was discussed with the mphasison the crack propagaion path.
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Received: 18 June 1991
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