Abstract：Effects of terminal forging temperature and deformation ratio on the microstructure and mechanical property of nonquenched and tempered bainitic steel have been studied by using JB30 impact testing machine, MTS material testing machine and OM. The results show that the effect of terminal forging temperature and deformation ratio on strength and toughness of nonquenched and tempered bainitic steel can be taken into account for the two factors:the volume fraction of ferrite,the size of original austenite grains and bainite sheaves. Since the decrease of the original austenite grains size, terminal forging temperature and increases of the deformation ratio resulted the decrease of bainite sheaves size, and the increase of hardness, strength and toughness of the steels. However, the terminal forging at 820 ℃ with true strain 6, the strength and hardness remarkably decreased because of the phase of Deformation Induced Ferrit Precipitation (DIFP), meanwhile, the volume fraction of ferrite phase reached about 10%.
彭金明;汪宏斌;吴晓春. 终锻温度和变形量对贝氏体型非调质钢强韧性的影响[J]. 钢铁, 2009, 44(5): 56-0.
PENG Jinming;WANG Hongbin;WU Xiaochun. Influence of Terminal Forging Temperature and Deformation Ratio on Strength and Toughness of NonQuenched and Tempered Bainitic Steel. Iron and Steel, 2009, 44(5): 56-0.
2009, Vol. 44 
