利用膨胀法结合金相分析在THERMECMASTOR-Z热模拟试验机上测定，获得了Mn-B钢的连续冷却转变曲线（CCT曲线），并研究了冷却速率对钢组织及硬度的影响。实验结果表明，在生产中冷却速度控制在2～15℃／s范围内，可以得到贝氏体为主、没有马氏体的组织；MnB钢的硬度随着冷却速率的增加逐渐增大。
By means of THERMECMASTOR-Z hot simulation testing machine combined with Diiatometric test, microstructure analysis and hardness measurmenmt, cooling transformation for Mn-B steels at different cooling rates were obtained, The influences of cooling rate on microstrueture and hardness were also studied, The results showed that keeping the cooling rate in production within 2- 15 ℃/s, the microstructure of Mn-B steels is mainly composed of bainite and no martensite. And the hardness of Mn-B bainite steel increases with the raise of cooling rate.
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