李婧,邵长静,刘相华,赵德文

• 1:辽宁石油化工大学机械工程学院
• 2:东北大学轧制技术及连轧自动化国家重点实验室
• 3:辽宁装备制造职业技术学院

摘要(Abstract)：

针对厚度超过90 mm Q345特厚钢板超声波探伤合格率较低的现象,采用高倍金相检验、扫描电镜、能谱分析和力学分析等方法对90 mm Q345超声波探伤检测不合格与合格钢板进行了对比研究。结果表明:引起特厚板超声波探伤不合格的原因是钢板厚度中心区域珠光体带中存在微裂纹。微裂纹产生的原因一方面是铸坯中心碳、锰元素偏析引起的组织应力及钢板轧后快速冷却引起的热应力,另一方面是钢板心部Mn S和氧化物等夹杂物的聚集致使与钢基体界面结合较弱,促进了微裂纹的萌生与扩展。通过改善铸坯质量、合理选择宽厚板铸坯坯型和合理安排轧制规程,有效提高了Q345宽厚板的超声波探伤检测合格率。

关键词(KeyWords)： 特厚板;探伤;微裂纹;偏析;夹杂物

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51374069);; 辽宁省博士启动基金(20131062)

作者(Author): 李婧,邵长静,刘相华,赵德文

DOI: 10.13289/j.issn.1009-6264.2015.05.022

参考文献(References)：

• [1]HU Jun,DU Lin-Xiu,XIE Hui,et al.Microstructure and mechanical properties of TMCP heavy plate microalloyed steel[J].Materials Science&Engineering A,2014,607:122-131.
• [2]刘清梅,魏丽艳.特厚板品种生产现状及新技术研究[J].上海金属,2011,33(6):57-60.LIU Qing-mei,WEI Li-yan.Manufacturing status of special heavy-thickness plate grades and the study of new technique[J].Shanghai Metals,2011,33(6):57-60.
• [3]常跃峰,王祖滨,赵文忠.低合金高强度宽厚钢板的发展趋势[J].钢铁,2007,42(8):1-6.CHANG Yue-feng,WANG Zu-bin,ZHAO Wen-zhong.Development trend of low alloy high strength heavy and wide plate[J].Iron and Steel,2007,42(8):1-6.
• [4]Narasaiah N,Ray K K.Small crack formation in low carbon steel with banded ferrite-pearlite structure[J].Materials Science and Engineering A,2005,392(1/2):269-277.
• [5]Hwang B,Lee H S,Kim Y G,et al.Analysis and prevention of side cracking phenomenon occurring during hot rolling of thick low-carbon steel plates[J].Materials Science and Engineering A,2005,402(1/2):177-187.
• [6]Holby E,Smith J F.Lamellar tearing-problem nobody seems to want to talk about[J].Welding Journal,1980(2):37-44.
• [7]Wilson W G.Minimizing lamellar tearing by improving Z-direction ductility[J].Welding Journal,1974,53(11):691-695.
• [8]朱书成.120mm Q390GJC-Z35特厚板Z向性能不合的研究[J].钢铁研究学报,2012,24(1):25-30.ZHU Shu-cheng.Analysis of disqualified z-direction property of 120mm Q390GJC-Z35 steel[J].Journal of Iron and Steel Research,2012,24(1):25-30.
• [9]谭清元,周远华,贾至立,等.Q345R钢板超声波探伤不合的原因分析[J].钢铁,2011,46(3):66-70.TAN Qing-yuan,ZHOU Yuan-hua,JIA Zhi-li,et al.Analysis on disqualification of Q345R steel plate by ultrasonic detection[J].Iron and Steel,2011,46(3):66-70.
• [10]Kiuchi M,Hsiang S H.Two-dimensional analysis of closing behaviours of internal porosity-study on application of limit analysis to rolling process[J].Journal of the Japan Society for Technology of Plasticity,1981,248(22):927-930.
• [11]赵德文,章顺虎,王根矶,等.厚板热轧中心气孔缺陷压合临界力学条件的证明与应用[J].应用力学学报,2011,28(6):658-662.ZHAO De-wen,ZHANG Shun-hu,WANG Gen-ji,et al.Derivation and application of criterion for closing a central void during plate hot rolling[J].Chinese Journal of Applied Mechanics,2011,28(6):658-662.
• [12]邓伟,赵德文,秦小梅,等.特厚板轧制缺陷压合模拟研究[J].钢铁,2009,44(9):58-62.DENG Wei,ZHAO De-wen,QIN Xiao-mei,et al.Simulation of defects closing behavior during ultra-heavy plate rolling[J].Iron and Steel,2009,44(9):58-62.
• [13]DENG Wei,ZHAO De-wen,QIN Xiao-mei,et al.Simulation of central crack closing behavior during ultra-heavy plate rolling[J].Computational Materials Science,2009,47(2):439-447.

文章评论(Comment)：