第36卷第2期 北京科技大学学报 Vol.36 No.2 2014年2月 Journal of University of Science and Technology Beijing Feb.2014 Q345B和AH32连铸板坯不同部位的高温延塑性 曾强国12，张博”，王福明 1)北京科技大学治金与生态工程学院，北京1000832)安阳钢铁集团有限责任公司，安阳455004 ☒通信作者，E-mail:wangfuming@metall..usth.cdu.cm 摘要通过Gleeble-15O0热模拟试验机，分别对取自同一块Q345B钢板坯的横向、纵向、竖向和中心四个方位的试样和 AHB2钢板坯表面及其厚度1/4处的六组不同部位的纵向试样进行了高温延塑性的研究.采用了金相显微镜和扫描电镜方法 对断口和附近的组织进行了观察.研究结果发现：Q345B钢板坯四个方位的试样低温区域(950℃以下)高温延塑性曲线变化 较小，而高温区域(950℃以上)的延塑性曲线变化相对较大.AH32钢板坯表面的三组纵向试样的高温延塑性曲线变化规律 相同，断面收缩率没有出现特别大的波动：而厚度1/4处的三组试样的高温延塑性曲线与表面的三组试样差异较大，断面收缩 率发生了很大波动，其原因主要是试样位于发达的柱状晶区，较表面的等轴晶区更容易出现微裂纹、元素的偏析、铸坯组织疏 松等缺陷. 关键词低合金高强钢：连铸板坯：高温性能：延展性 分类号TF777.1 High temperature ductility of Q345B and AH32 continuous casting slabs at different positions ZENG Qiang-guo,ZHANG Bo,WANG Fu-ming 1)School of Metallurgical and Ecological Engineering.University of Science and Technology Beijing,Beijing 100083,China 2)Anyang Iron and Steel Corporation,Anyang 455004,China Corresponding author,E-mail:wangfuming@metall.ustb.edu.cn ABSTRACT The high temperature ductility of samples,taking from a Q345B continuous casting slab in the transverse direction, drawing direction,vertical direction and at the central part,as well as an AH32 continuous casting slab at the surface and 1/4 thick- ness position,was investigated by using a Gleeble-1500 testing machine.The fractographs and microstructures of high-temperature tensile samples were observed by optical microscopy and scanning electron microscopy.Experimental results show that the high temper- ature ductility below 950C changes little between 4 groups of different samples from the 0345B slab,but the variation tendencies of high temperature ductility above 950 C are greatly different.The changes of high temperature ductility of 3 groups of samples from the AH32 slab at the surface are the same,and the reduction of area has little fluctuation.Whereas the high temperature ductility of 3 groups of samples at the 1/4 thickness differs entirely from that at the surface,and the reduction of area appears fluctuant greatly.The reason is that microcracks,composition segregation,porosity and looseness occur more easily in the columnar crystal zone of sampling than in the equiaxed crystal zone of the surface. KEY WORDS high-strength low-alloy steel:continuous casting slabs;high temperature properties;ductility 低合金高强度(HSLA)结构钢由于合金元素作 减轻自重，节约钢材，另一方面安全可靠性更高 用，具有较高强度和韧性，工艺性能较好，生产成本 AH32是目前钢铁材料中产量最大的一类，该类钢 低，应用十分广泛.如Q345系列钢种，普遍应用于 种的冶炼技术相对成熟，对炼钢设备要求相对宽松， 各类结构件.AH32广泛用于造船行业，一方面可以 但在连铸坯质量控制方面，实际上往往会出现各种 收稿日期：2012一12-10 DOI:10.13374/j.issn1001-053x.2014.02.007:http:/journals.ustb.edu.cn第 36 卷 第 2 期 2014 年 2 月 北京科技大学学报 Journal of University of Science and Technology Beijing Vol． 36 No． 2 Feb． 2014 Q345B 和 AH32 连铸板坯不同部位的高温延塑性 曾强国1，2) ，张 博1) ，王福明1)  1) 北京科技大学冶金与生态工程学院，北京 100083 2) 安阳钢铁集团有限责任公司，安阳 455004  通信作者，E-mail: wangfuming@ metall． ustb． edu． cn 摘 要 通过 Gleeble--1500 热模拟试验机，分别对取自同一块 Q345B 钢板坯的横向、纵向、竖向和中心四个方位的试样和 AH32 钢板坯表面及其厚度 1 /4 处的六组不同部位的纵向试样进行了高温延塑性的研究． 采用了金相显微镜和扫描电镜方法 对断口和附近的组织进行了观察． 研究结果发现: Q345B 钢板坯四个方位的试样低温区域( 950 ℃ 以下) 高温延塑性曲线变化 较小，而高温区域( 950 ℃以上) 的延塑性曲线变化相对较大． AH32 钢板坯表面的三组纵向试样的高温延塑性曲线变化规律 相同，断面收缩率没有出现特别大的波动; 而厚度 1 /4 处的三组试样的高温延塑性曲线与表面的三组试样差异较大，断面收缩 率发生了很大波动，其原因主要是试样位于发达的柱状晶区，较表面的等轴晶区更容易出现微裂纹、元素的偏析、铸坯组织疏 松等缺陷． 关键词 低合金高强钢; 连铸板坯; 高温性能; 延展性 分类号 TF 777. 1 High temperature ductility of Q345B and AH32 continuous casting slabs at different positions ZENG Qiang-guo1，2) ，ZHANG Bo1) ，WANG Fu-ming1)  1) School of Metallurgical and Ecological Engineering，University of Science and Technology Beijing，Beijing 100083，China 2) Anyang Iron and Steel Corporation，Anyang 455004，China  Corresponding author，E-mail: wangfuming@ metall． ustb． edu． cn ABSTＲACT The high temperature ductility of samples，taking from a Q345B continuous casting slab in the transverse direction， drawing direction，vertical direction and at the central part，as well as an AH32 continuous casting slab at the surface and 1 /4 thick￾ness position，was investigated by using a Gleeble-1500 testing machine． The fractographs and microstructures of high-temperature tensile samples were observed by optical microscopy and scanning electron microscopy． Experimental results show that the high temper￾ature ductility below 950 ℃ changes little between 4 groups of different samples from the Q345B slab，but the variation tendencies of high temperature ductility above 950 ℃ are greatly different． The changes of high temperature ductility of 3 groups of samples from the AH32 slab at the surface are the same，and the reduction of area has little fluctuation． Whereas the high temperature ductility of 3 groups of samples at the 1 /4 thickness differs entirely from that at the surface，and the reduction of area appears fluctuant greatly． The reason is that microcracks，composition segregation，porosity and looseness occur more easily in the columnar crystal zone of sampling than in the equiaxed crystal zone of the surface． KEY WOＲDS high-strength low-alloy steel; continuous casting slabs; high temperature properties; ductility 收稿日期: 2012--12--10 DOI: 10． 13374 /j． issn1001--053x． 2014． 02． 007; http: / /journals． ustb． edu． cn 低合金高强度( HSLA) 结构钢由于合金元素作 用，具有较高强度和韧性，工艺性能较好，生产成本 低，应用十分广泛． 如 Q345 系列钢种，普遍应用于 各类结构件． AH32 广泛用于造船行业，一方面可以 减轻自重，节约钢材，另一方面安全可靠性更高． AH32 是目前钢铁材料中产量最大的一类，该类钢 种的冶炼技术相对成熟，对炼钢设备要求相对宽松， 但在连铸坯质量控制方面，实际上往往会出现各种