摘要
文章采用焊接热模拟技术和现代物理测试的方法,系统研究了管线钢焊接粗晶区的韧性特征,从控制粗晶区韧性的成分因素、工艺因素和组织结构因素出发,探讨了有关控制途径。研究结果表明,不同化学成分的管线钢对焊接热过程具有不同的敏感性,在钢中加入一定量的Ti、Nb微合金化元素,通过TiN、NbC、NbN来控制焊接粗晶区的晶粒尺寸,可达到改善韧性的目的;焊接粗晶区的韧性随焊接冷却时间t_(8/5)呈非单调变化,在中等焊接冷却时间t_(8/5)下韧性值较高;焊后热处理对焊接粗晶区有一定的韧化效果;管线钢的主体组织为针状铁素体和细小的粒状贝氏体时具有较高的韧性。对管线钢焊接粗晶区韧性控制因素的研究,为高质量地进行管线施工和保证输送管线的安全可靠运行奠定了理论基础,对实际生产具有一定的指导意义。
Adopting hot simulated technology and modern physics method, steel tenacity features at thick crystal welding area of pipeline steel has been studied at this article, from organization structural factor, technology factor and the composition factor and relevant control ways have been discussed, theoretical foundations have been established which have certain guidance meaning for actual production for high quality and safe reliable operation of pipeline construction.
出处
《石油工程建设》
北大核心
2003年第3期1-2,22,共3页
Petroleum Engineering Construction
关键词
油气管道
管线钢
焊接
粗晶区
韧性
控制因素
特征
pipeline steel, welding, thick crystal area, tenacity, characteristic, research, control ways
