CRITICAL VOID-GROWTH RATIO AND DUCTILE-BRITTLE TRANSITION OF STEELS
ZHOU Li(Wuyi University;Jiangmen 529020);GOU Wenxuan(Northwestern Polytechnical University;Xi'an 710072)(Departinent of Civil Engineering;Wuyi University;Jiangmen 529020)(Manuscript received 1995-12-22;in revised form 1996-06-09)
Cite this article:
ZHOU Li(Wuyi University;Jiangmen 529020);GOU Wenxuan(Northwestern Polytechnical University;Xi'an 710072)(Departinent of Civil Engineering;Wuyi University;Jiangmen 529020)(Manuscript received 1995-12-22;in revised form 1996-06-09). CRITICAL VOID-GROWTH RATIO AND DUCTILE-BRITTLE TRANSITION OF STEELS. Acta Metall Sin, 1996, 32(10): 1063-1067.
Abstract The critical void-growth ratio,Rc/Ro,of steel BHW60,steel 20 or steel 45 was measured quantitatively under SEM,and the measured positions are at the core of fracture surface of cylindrical tensile specimens.The ductile-brittle transitions due to both temperature and torsional prestrain were discussed by means of the micoscopic parameter ln(Rc/Ro).The concepts of both nil-ductility trasition stress triaxiality Tσ,ND and nil-brittility transition stress triaxiality Tσ,NB were proposed and the coupled effect of temrepature and stress states on the ductile-brittle transition was analyzed
