图(a)和(b)分别为DZ2(0.05V0Nb)钢经900℃油淬及在675℃回火时间分别为1h和4h后的OM组织形貌。由图可以知,DZ2(0.05V0Nb)经过回火后组织均为回火马氏体,且随着回火温度的升高,马氏体板条没有明显的变化。
Figures (a) and (b) show the OM morphology of DZ2 (0.05V0Nb) steel after oil quenching at 900℃ and tempering at 675℃ for 1h and 4h, respectively. As can be seen from the figure, the microstructure of DZ2 (0.05v0Nb) after tempering is all tempered martensite, and with the increase of tempering temperature, the martensite slat has no obvious change.