1. Department of Materials Science, Fudan University, Shanghai 200433, China 2. Metallurgical Process Department, Research and Development Center, Baoshan Iron and Steel Co Ltd, Shanghai 201900, China
Effect of Mg Addition on Inhibiting Austenite Grain Growth in Heat Affected Zones of Ti-Bearing Low Carbon Steels
1. Department of Materials Science, Fudan University, Shanghai 200433, China 2. Metallurgical Process Department, Research and Development Center, Baoshan Iron and Steel Co Ltd, Shanghai 201900, China
ժҪ To study the effect of Mg addition on inhibiting weld heat affected zones (HAZ) austenite grain growth of Ti-bearing low carbon steels, two steels with and without Mg treated were prepared using a laboratory vacuum. The welding testing was simulated by Gleeble 3500 thermomechanical simulator. The performance of HAZ was investigated that the toughness was improved from 33 to 185 J by adding 0.005% Mg (in mass percent) to the steel, and the fracture mechanism changed from cleavage fracture to toughness fracture. Through in-situ observation by a confocal scanning laser microscope, a significant result was found that the austenite grain of the steel with Mg treated was still keeping fine-grained structure after holding at 1400 �� and lasting for 300 s. This inhibition of austenite grain growth was mainly attributed to the formation of pinning particles after the addition of Mg. The obtained results propose a potential method for improving HAZ toughness of structure steels.
Abstract��To study the effect of Mg addition on inhibiting weld heat affected zones (HAZ) austenite grain growth of Ti-bearing low carbon steels, two steels with and without Mg treated were prepared using a laboratory vacuum. The welding testing was simulated by Gleeble 3500 thermomechanical simulator. The performance of HAZ was investigated that the toughness was improved from 33 to 185 J by adding 0.005% Mg (in mass percent) to the steel, and the fracture mechanism changed from cleavage fracture to toughness fracture. Through in-situ observation by a confocal scanning laser microscope, a significant result was found that the austenite grain of the steel with Mg treated was still keeping fine-grained structure after holding at 1400 �� and lasting for 300 s. This inhibition of austenite grain growth was mainly attributed to the formation of pinning particles after the addition of Mg. The obtained results propose a potential method for improving HAZ toughness of structure steels.
ZHU Kai,,YANG Jian,WANG Rui-zhi,YANG Zhen-guo. Effect of Mg Addition on Inhibiting Austenite Grain Growth in Heat Affected Zones of Ti-Bearing Low Carbon Steels[J]. �й������ڿ���, 2011, 18(9): 60-64.
ZHU Kai,,YANG Jian,WANG Rui-zhi,YANG Zhen-guo. Effect of Mg Addition on Inhibiting Austenite Grain Growth in Heat Affected Zones of Ti-Bearing Low Carbon Steels. Chinese Journal of Iron and Steel, 2011, 18(9): 60-64.
2011, Vol. 18 
