X90级管线钢应变时效行为  

Strain aging behavior of X90 pipeline steel

作　　者：郑生斌[1] 熊祥江[2] 李中平[2] 史术华 范明[2] 陈奇明[2] 冷鹏[3] 刘世泽 

机构地区：[1]湘潭钢铁集团有限公司办公室,湖南湘潭411101 [2]湘潭钢铁集团有限公司技术中心,湖南湘潭411101 [3]湘潭钢铁集团有限公司五米宽厚板厂,湖南湘潭411101 [4]番禺珠江钢管有限公司,广东番禺511450

出　　处：《金属热处理》2016年第6期27-30,共4页Heat Treatment of Metals

摘　　要：针对高级管线钢应变时效问题,对X90级直缝埋弧焊管管体不同预应变及时效前后的组织和力学性能进行了对比,研究了应变时效对X90级管线钢组织和力学性能的影响。结果表明：不同应变时效前后X90级管线钢的显微组织和冲击韧性变化不明显;应变时效后拉伸曲线由拱顶型连续曲线转变为吕德斯型屈服曲线,屈服强度增加,屈强比升高;预应变量越大,屈服强度和屈强比升高越显著,且横向性能受到预应变量的影响比纵向要大,而200~250℃温度区间时效对屈服强度和屈强比影响较小。Aiming at the strain aging process for high grade pipeline steel, a series of comparative researches were carried out on the microstructure and mechanical properties of X90 longitudinal submerged arc welded pipe before and after different strain aging processes, and the effect of stain aging on microstructure and mechanical properties of X90 pipeline steel was investigated. The results indicate that before and after different stain aging processes, the change of microstructure and impact toughness of X90 pipeline steel is not obvious. The tensile curve changes from round house-shaped continuous curve to Ltiders curve, and yield strength and yield ratio increase after stain aging process. The higher the pre-strain value is, the more significant the increments of yield strength and yield ratio are, and the transverse properties is more strongly affected than the longitudinal properties, while the aging process in the range of 200-250 ℃ has a little influence on yield strength and yield ratio.

关 键 词：应变时效 管线钢 组织 力学性能 

分 类 号：TG156.9[金属学及工艺—热处理]