论文部分内容阅读
采用膨胀法、金相法研究了不同As含量45钢的过冷奥氏体连续冷却转变过程,分析了45钢在不同冷速下过冷奥氏体的组织转变,测定了试验钢的室温抗拉强度与冲击功,并利用扫描电镜(SEM)观察了断口形貌。研究结果表明,随砷含量的增加,45钢组织中的铁素体含量增加,且较易形成晶内铁素体;砷的加入缩短了贝氏体转变的孕育期,使45钢的过冷奥氏体连续冷却转变曲线明显左移,其M s点温度随砷含量的增加依次下降;砷含量<0.25%时,对45钢强度与韧性的影响并不明显。
The expansion process and metallographic method were used to study the continuous cooling transformation process of undercooled austenite with different content of 45 As and the microstructure transformation of 45 supercooled austenite at different cooling rates was analyzed. The tensile strength at room temperature And impact energy, and the fracture morphology was observed by scanning electron microscopy (SEM). The results show that with the increase of arsenic content, the content of ferrite in 45 steel increases, and it is easier to form intragranular ferrite. The addition of arsenic shortens the incubation period of bainite transformation and makes 45 steel too cold The austenite continuous cooling transformation curve shifted to the left obviously, and the M s point temperature decreased with the increase of arsenic content. When the arsenic content was below 0.25%, the strength and toughness of 45 steel were not obvious.