用JB30冲击试验机、MTS材料试验机和OM等试验方法分析了两种终锻温度（820 ℃和950 ℃）和三种变形量(3、4、6，锻造变形前后工件截面积的比值)条件下，贝氏体型非调质钢强韧性的变化及其微观组织的区别。研究结果表明：终锻温度和变形量对贝氏体型非调质钢强韧性的主要影响可以从铁素体含量、原始奥氏体晶粒和贝氏体束尺寸等因素来考虑。终锻温度降低、变形量增大、原始奥氏体晶粒尺寸减小导致贝氏体束尺寸减小，硬度、强度和冲击韧性增加；而当终锻温度为820 ℃和变形量为6时，由于变形诱导铁素体相变，铁素体体积分数达到10%，强度和硬度明显降低。
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%.
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