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| Effect of Mo and Cr on the Behaviour of Continuous Cooling Transformation of Nb-Ti Bearing Low Carbon Microalloyed Steels |
| LI Bing,ZHENG Lei,CUI Tian-cheng,ZHANG Chuan-guo |
| Research and Development Center, Baoshan Iron and Steel Co.， Ltd., Shanghai 201900, China |
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Abstract The effect of molybdenum (Mo) and chromium (Cr) on the behaviour of continuous cooling transformation (CCT) of low carbon microalloyed steels containing niobium (Nb) and titanium (Ti) was investigated by using a Gleeble 3800 thermomechanical simulator and heat expansion method. The phase transformation temperature of three low carbon microalloyed steels at various cooling rates with different content of Mo and Cr was detected, the microstructure was observed by optical microscopy and scanning electron microscopy, and vickers hardness was also tested, then the dynamic continuous cooling transformation curves were determined. As a result, the transformation temperature from deformed austenite to acicular ferrite is decreased with adding Mo and Cr in the steels, and the effect of Mo is more significant than that of Cr when the cooling rate is above 1℃/s, and the formation of proeutecid ferrite and pearlite is inhabited or postponed. Mo and Cr element also can enlarge the range of cooling rate for forming acicular ferrite, and can refine the microstructure effectively.
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Received: 16 August 2010
Published: 01 November 2011
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2011, Vol. 46 
