摘要
利用热模拟试验机、OM、TEM等试验设备,研究了Ti-Nb微合金化高速护栏钢的连续冷却组织转变规律,建立了试验钢的CCT曲线。研究结果表明:当冷速为0.5℃/s时,试验钢中的奥氏体发生铁素体-珠光体相变;当冷速大于1℃/s时,开始发生贝氏体相变;当冷速为10~20℃/s时,既发生铁素体-贝氏体相变又发生马氏体相变;当冷速≥30℃/s时,发生贝氏体-马氏体的相变。随着冷速的增加,试验钢的硬度也随之增大。在不同冷速下钢中均存在(Ti, Nb)C析出物,且在钢中呈弥散分布,在低冷速条件下,钢中析出物的体积分数较大,尺寸较小,具有一定的析出强化效果。
The thermal simulation testing machine,OM,TEM and other experimental equipment were used to study the continuous cooling transformation behavior of Ti-Nb microalloyed high-speed guardrail steel in the experiment.The results show that when the cooling rate is 0.5℃/s,the austenite of the test steel emerges ferrite-pearlite phase transformation.When the cooling rate is greater than 1℃/s,the bainite phase transformation begins to occur.At the cooling rate of 10~20℃/s,both ferrite-bainite phase transformation and martensite phase transformation come out.While the bainite-martensite phase transformation appears when the cooling rate rises to 30℃/s.As the cooling rate increases,the hardness of the test steel also improves.There exists(Ti,Nb)dispersed precipitates in the steel at different cooling rates.In the condition of low cooling rate,the volume fraction of the precipitates in the steel is larger,and the size is smaller,which has a certain precipitation strengthening effect.
作者
李焱祺
甘晓龙
刘亚军
王成
张卓宇
Li Yanqi;Gan Xiaolong;Liu Yajun;Wang Cheng;Zhang Zhuoyu(Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;Wuhan Iron and Steel Company Limited,Wuhan 430080,Hubei,China)
出处
《钢铁钒钛》
CAS
北大核心
2023年第2期153-159,共7页
Iron Steel Vanadium Titanium
基金
国家自然科学基金面上项目(51874216)。
