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研究了碳含量为0.045%的HSLA100贝氏体钢在两相区加热过程中的组织演变特征。结果表明:两相区加热温度决定奥氏体的转变量,而相变产物的形貌特征主要受奥氏体中的碳含量控制;实验钢在700、720、740、760和820℃保温时,钢中奥氏体转变量分别为10%、24%、38%、60%和100%,奥氏体中的碳含量分别为0.345%、0.293%、0.243%、0.193%和0.045%;显微组织为多边形铁素体+M-A岛,随温度的升高,多边形铁素体量逐渐增加。
The microstructure evolution of HSLA100 bainitic steel with carbon content of 0.045% during heating in two-phase zone was studied. The results show that the heating temperature of the two-phase zone determines the amount of austenite transformation, while the morphology of the phase transformation products is mainly controlled by the carbon content of austenite. When the experimental steels are incubated at 700, 720, 740, 760 and 820 ℃ , The austenite transformations in steel are 10%, 24%, 38%, 60% and 100% respectively, and the contents of austenite are 0.345%, 0.293%, 0.243%, 0.193% and 0.045% The microstructure is polygonal ferrite + MA island. With the increase of temperature, the amount of polygonal ferrite gradually increases.