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X80管线钢宽厚板坯质量研究
Study on the Quality of Wide and Thick X80 Pipeline Steel Billet
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- DOI:
- 作者:
- 高燕 姜金星 左秀荣 姬颍伦 王慧慧
GAO Yan;JIANG Jinxing;ZUO Xiurong;JI Yinglun;WANG Huihui
- 作者单位:
- 南京钢铁股份有限公司 郑州大学材料物理教育部重点实验室
Nanjing Iron and Steel Co., Ltd., Nanjing 210035, China;Key Laboratory of Material Physics, Ministry of Education,Zhengzhou University, Zhengzhou 450052, China
- 关键词:
- X80管线钢 板坯 偏析 白亮带 微观组织 硬度
X80 pipeline steel continuous casting slab segregation white band microstructure hardness
- 摘要:
- 采用等离子体发射光谱仪、金相显微镜、显微硬度仪研究了X80宽厚板坯厚度方向化学成分、微观组织、硬度的变化规律。研究表明:各元素在白亮带区域发生了负偏析,铸坯中心偏析较轻。Si、Mn、Cr、Cu、Mo、Nb在铸坯厚度方向分布均匀,C、Ni在内弧侧白亮带的上部发生明显的正偏析,在内弧侧白亮带的下部发生负偏析。其它元素在白亮带位置发生了明显的负偏析,白亮带处硬度值显著降低。铸坯中心是最后凝固区域,冷却速度降低导致这个区域的晶粒比较粗大造成铸坯中心处硬度标准偏差较大;在上部靠近内弧侧白亮带处,C、Ni等元素富集导致硬度值异常升高。Chemical composition, microstructure and hardness of the slab with the change of thickness were studied by inductively coupled plasma-atomic(optical) emission spectrometry, metallographic microscopy and microhardness tester.Research shows that negative segregation was produced in white band layer, resulting obvious decrease in hardness.Positive segregation layer of C and Ni was located above white band layers in inner arc, and negative segregation layer of C and Ni was located below white band layers. The internal segregation is not serious. Si, Mn, Cr, Cu, Mo and Nb distributed homogeneously in thickness direction. Standard deviation of hardness in billet center was higher than other location. The billet center was the final solidification zone, cooling rate decrease in this zone resulted coarse grains.Positive segregation layer of C and Ni located above white band layers in inner arc resulted the highest hardness in thickness direction.