摘要
为明确AH36船板钢裂纹产生阶段进而解决热送裂纹问题,采用MMS-200热模拟试验机进行了热模拟拉伸实验,探究了不同热履历对AH36船板钢铸坯高温热塑性的影响,并以其强度极限建立了各过程出现表面裂纹判据,采用有限元软件ABAQUS对两相区热装及低温热装工艺过程中铸坯的温度场及应力场进行了数值模拟,并使用判据进行了裂纹风险分析。结果表明:装炉前的输送过程中,铸坯脆性温度区间为750~850℃,出现热裂纹的风险较小,两相区热装后再加热过程中铸坯脆性温度区更大,为750~1050℃,易出现裂纹,低温热装的再加热过程中铸坯出现裂纹风险亦较小;通过非线性拟合建立了各过程的表面裂纹判据,热装前辊道冷却过程、两相区热装后的再加热过程、低温热装后的再加热过程的各模型相关系数R~2分别为0.9956、0.9971、0.9959,拟合精度良好。
To clarify the stage of crack generation of AH36 ship plate steel and solve the problem of hot charging cracks,thermal simulation tensile tests were conducted with the MMS-200 thermal simulation machine to investigate the effects of different thermal histories on the hot ductility of AH36 ship plate steel billet.Surface crack criteria for each process were established by the strength limit of AH36 ship plate steel.The temperature and stress fields of the billets during the two-phase hot charging and low-temperature hot charging processes were simulated by ABAQUS,and crack criteria were applied to the simulation results to analyze the risk of the crack.The results show that during the conveying process before charging,the brittle temperature zone of the billet appears at 750-850℃,and the risk of cracking is relatively low.The brittle temperature zone during the reheating process after hot charging in the two-phase zone is larger,which is 750-1050℃,and it is easy to crack.The risk of cracking of the billet during the reheating process of low-temperature hot charging is also lower.The surface crack criterion of each process was established by nonlinear fitting.The correlation coefficients R2 of the models for the cooling process before hot charging,the reheating process after two-phase zone hot charging,and the reheating process after low-temperature hot charging are 0.9956,0.9971,and 0.9959,respectively.And the fitting accuracy is good.
作者
王麟
李海军
潘瑜
宁新禹
李睿昊
WANG Lin;LI Haijun;PAN Yu;NING Xinyu;LI Ruihao(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China)
出处
《轧钢》
2023年第5期32-37,共6页
Steel Rolling
关键词
AH36船板钢
热送裂纹
热模拟拉伸
数值模拟
温度场
应力场
表面裂纹判据
AH36 ship plate steel
hot charging crack
thermal simulation tensile
numerical simulation
temperature field
stress field
surface crack criteria
