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通过对MMS200热模拟试验机进行Mn-Nb-Mo和Mn-Nb-Mo-B两种高级别管线试验钢的热膨胀试验和单道次压缩试验,测定了两种试验钢的连续冷却转变动力学曲线(CCT),并研究了硼对不同冷速下的组织转变和动态再结晶的影响。研究结果表明:硼元素的添加扩大了钢的下贝氏体转变区域,降低了贝氏体开始转变温度;Mn-Nb-Mo系试验钢在冷速>15℃/s时,得到下贝氏体组织,而Mn-Nb-Mo-B系试验钢在冷速大于5℃/s时,就出现下贝氏体组织;微量硼的添加可显著地推迟试验钢的动态再结晶。
The heat-expansion test and single-pass compression test of two high-grade pipeline test steels, Mn-Nb-Mo and Mn-Nb-Mo-B, were carried out on the MMS200 thermal simulation test machine to measure the continuous cooling transformation kinetics Curve (CCT), and studied the effect of boron on the microstructure and dynamic recrystallization at different cooling rates. The results show that the boron addition increases the lower bainite transformation area and decreases the bainite transformation temperature. When the cooling rate is higher than 15 ℃ / s in Mn-Nb-Mo test steel, However, the microstructure of the Mn-Nb-Mo-B steel was observed when the cooling rate was more than 5 ℃ / s. The addition of trace boron significantly delayed the dynamic recrystallization of the test steel.