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研究了一种Ｃｒ－Ｍｎ－Ｍｏ－Ｂ低碳低合金贝氏体钢热变形后奥氏体的连续冷却转变，获得了试验用钢热变形后奥氏体的连续冷却转变曲线。试验结果表明，本试验用钢不发生先共析铁素体析出的临界冷却速度为０．１５℃／ｓ；冷却速度在０．１５～１．００℃／ｓ范围时可得到全部粒状贝氏体组织；随着冷却速度的降低，粒状贝氏体中的小岛尺寸增大，数目减少。
The continuous cooling transformation of austenite after hot deformation of Cr-Mn-Mo-B low-carbon low-alloy bainite steel was studied. The continuous cooling transformation curve of austenite after hot deformation was obtained. The experimental results show that the critical cooling rate of pro-eutectoid ferrite without using this test steel is 0.15 ℃ / s, and all the granular Bailey’s can be obtained at the cooling rate of 0.15 ~ 1.00 ℃ / s Body organization; As the cooling rate decreases, the size of the island in granular bainite increases and the number decreases.