为控制粒状贝氏体的组织形态,在热模拟试验机上对新研制的非调质冷镦用钢进行了研究。主要分析了变形温度和冷却方法对粒状贝氏体组织中岛状物的影响。结果表明,在给定的变形温度和冷却条件下可以得到完全的粒状贝氏体组织;变形温度和冷却方法对粒状贝氏体组织中的岛状物有明显影响。低温变形和采用快冷＋缓冷的双冷速方法可细化粒状贝氏体组织中的岛状物,使岛状物的数量增加,但体积分数减少。
In order to control the microstructure of granular bainite,a newly developed non-quenched and tempered steel for cold heading was studied by a thermo-mechanical simulator.Effects of different deformation temperatures and cooling methods on the islands of granular bainite were analyzed.The results indicate that the microstructure of the steel is totally granular bainite under the given deformation temperatures and cooling methods,and deformation temperature and cooling method have an obvious influence on the islands of granular bainite.Lower deformation temperature and dual-rate cooling method（rapid cooling and subsequently slow cooling） refine the islands of granular bainite,resulting in a large amount but a small volume fraction of the islands.Vickers hardness testing approves that lower deformation temperature and dual-rate cooling method can soften the steel.
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