正火对特厚板组织及性能的影响.pdfVIP

正火对特厚板组织及性能的影响 杨永达 李春智 沈钦义 姜中行 （首钢技术研究院，北京 100043 ） 1 摘 要 通过小炉正火热处理实验，研究了正火处理对 125mm 及 150mm 特厚板微观组织及力学性能的影响。比较 了轧态与正火后钢板力学性能及微观组织，结果表明：正火后，表面处的贝氏体转变成铁素体和珠光体，厚度方向 1/4 处和 1/2 处铁素体及珠光体组织较轧态明显细化；表面处的屈服强度及抗拉强度明显降低，冲击韧性得到改善， 厚度方向 1/4 处和 1/2 处屈服强度及冲击韧性明显提到，抗拉强度略有降低。为现场生产 125mm 或 150mm 特厚钢 板提供了指导，提高了产品的质量，增强了产品的市场竞争力。 关键词 特厚板 正火 微观组织 力学性能 Effect of Normalize on Microstructure and Propertiesof Ultra Heavy Plate Yang Yongda Li Chunzhi Shen Qinyi Jiang Zhonghang （Shougang Research Institute of Technology，Beijing, 100043 ） Abstract Through the normalizing experiment in the small furnace, Effect of normalize on microstructure and mechanical properties of heavy plate with thickness of 125mm and 150mm-thick was investigated. Experimental results show that after normalized, bainite of surface of steel plate change into ferrite and pearlite. Comparing with microstructure of steel plate with hot rolling process, grain of ferritic and pearlite in one quarter and one half of the steel along thickness direction visibly got refined after normalizing. Yield strength and tensile strength on the surface of steel plate obviously declined and impact toughness significantly improved. In one quarter and one half of the steel plate, yield strength and impact toughness obviously improved after normalizing, however, tensile strength decreased a little. The results of investigation will provide a guideline for the production of 125mm and 150mm-thick ultra heavy plate and improve the quality of the products to enhance competitiveness of product in the market. Key words ultra heavy plate, normalizing, microstructure, mechanical properties