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《Chinese Journal of Engineering》 2017-06
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Influence of Ti-rare earth addition on microstructure and toughness of coarse grain heat-affected zone in C-Mn steel

ZHANG Sheng-hua;SONG Bo;SONG Ming-ming;GAO Qi-rui;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing;State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing;State Key Laboratory for Refractories and Metallurgy,Wuhan University of Science and Technology;  
The influences of rare earth(RE) and Ti-RE complex treatment on the microstructures and toughness in the coarse grain heat-affected zone(CGHAZ) of C-Mn steel were investigated using a Gleeble-1500 D thermal simulator with input heat energy of 65 kJ·cm~(-1).The inclusions and impact fracture morphology were observed and analyzed by scanning electron microscopy(SEM)and energy-dispersive X-ray(EDX),and the microstructure was characterized using an optical microscope(OM).The results show that the microstructures in the CGHAZs of RE-and Ti-RE-treated samples are mainly grain boundary ferrite(GBF)+polygonal ferrite(PF)+intragranular acicular ferrite(IAF) and grain boundary ferrite+intragranular acicular ferrite,respectively.Inclusions in the RE-treated specimen are La_2O_2S+Mn-Al-Si-O+MnS,while those in the Ti-RE-treated specimen are La_2O_2S+TiO_x+Mn-Al-Si-O+MnS.The complex inclusions in Ti-RE-treated steel are smaller than those in RE-treated steel,and the size of IAF in Ti-RE-treated steel is smaller.The impact properties of the CGHAZ in Ti-RE-treated C-Mn steel is improved significantly,and the material is tougher than RE-treated steel.
【Fund】: 国家自然科学基金资助项目(51274269)
【CateGory Index】: TG457.11
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