摘要
海工钢特厚板在海洋工程中广泛使用,其通过微合金化和热处理工艺生产。特厚板需在380~420℃缓冷,控制奥氏体向针状铁素体和贝氏体转变,以获得优异的力学性能。根据EH420海工钢80 mm特厚板堆垛工艺建立数学模型,通过实际测温验证了模型准确性,研究了堆垛参数对海工钢特厚板在组织转变区停留时间的影响。特厚板堆垛之后,表层温度快速降低,而中部和底部降温速率明显减缓。堆垛速率对特厚板冷却影响较小,而堆垛初始温度影响较大。特厚板堆垛初始温度从400℃增加至500℃,堆垛中心在组织转变区停留时间从35.6 h降低至15.1 h。随着特厚板堆垛高度增加,冷却时间延长。堆垛高度从2.0 m增加至3.0 m时,堆垛中部在组织转变区停留时间从17.1 h增至20.8 h,主要是堆垛表面积减小和冷却速率降低造成。
Extra-thick plates of marine steel are widely used in marine engineering and are produced by microalloying and heat treatment process.The extra-thick plate needs to be slowly cooled at 380℃-420℃ to control the transformation form the austenite to acicular ferrite and bainite,which can obtain excellent mechanical properties.A mathematical model is es tablished for the stacking process of 80 mm extra-thick plates of EH420 marine steel,and the accuracy of the model was verified by actual temperature measurement.The influence of stacking parameters on the residence time of extra-thick plates of marine steel in the transformation zone is studied.It is found that the temperature of the surface layer of plate stacking gradually decreases,while the decrease rate of temperature in the middle and bottom of the stacking are signifi cantly lower.The stacking rate has little effect on the cooling rate,while the initial temperature of the plate has a great im pact on the cooling rate.With the initial temperature of the extra-thick plates stacking increasing from 400℃ to 500℃,the residence time of the stacking center in the phase transformation zone decreases from 35.6 h to 15.1 h.As the height of extra-thick plates stacking increases,the time required for cooling time rises.When the stacking height increases from 2.0 m to 3.0 m,the residence time in the structure transformation zone in the middle of the stacking increases from 17.1 h to 20.8 h,which is caused by the decrease of the stacking surface and the cooling rate.
作者
鲍雪君
姜东滨
刘朝霞
刘俊
孙宪进
尹青
吴小林
任英
张立峰
Bao Xuejun;Jiang Dongbin;Liu Zhaoxia;Liu Jun;Sun Xianjin;Yi Qing;Wu Xiaolin;Ren Ying;Zhang Lifeng(User Application Technology Research Instiqute,Citic Pacific Special Spcial Steel Group Co.,Ltd.,Jiangyin 214429,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Jiangyin Xingcheng Special Steel Works Co.,Ltd.,Jiangyin 214429,China;School of Mechanical and Material Engineering,North China University of Technology,Beijing 100144,China)
出处
《特殊钢》
2025年第5期72-79,共8页
Special Steel
基金
国家重点研发计划项目(No.2023YFB3709900)
国家自然科学基金项目(No.52374318)。
关键词
特厚板
堆垛
缓冷
数值模拟
Extra-thick Plates
Stack
Slow Cooling
Numerical Simulation
作者简介
鲍雪君(1982-),男,硕士,高级工程师,E-mail:baoxuejun@citicsteel.com。
