论文部分内容阅读
利用投射电子显微镜和万能试验机对不同回火温度下加工器械用钢的力学性能和显微组织进行研究。结果表明:随着回火温度的升高,试验钢的抗拉和屈服强度都减小,其伸长率和冲击韧度呈上升趋势;当回火温度较低时,钢中析出大量碳化物,提高了其强度;当温度升高,析出的碳化物宽度变窄,试验钢脆性增加;当回火温度进一步升高后,钢中局部出现铁素体晶块;当回火温度为550℃时,纳米级碳化物析出,起到了细晶强化作用。
The mechanical properties and microstructure of the steels processed by different tempering temperatures were studied by using projection electron microscope and universal testing machine. The results show that with the increase of tempering temperature, the tensile strength and yield strength of the test steel decrease, and the elongation and impact toughness increase. When the tempering temperature is low, a large amount of carbides , Increasing its strength; when the temperature is raised, the width of precipitated carbide narrows, the brittleness of the test steel increases; when the tempering temperature further increases, the ferrite grains locally appear in the steel; when the tempering temperature is 550 ° C. When, nano-carbide precipitation, played a fine grain strengthening effect.