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.
出处
《金属热处理》
CAS
CSCD
北大核心
2016年第6期27-30,共4页
Heat Treatment of Metals
关键词
应变时效
管线钢
组织
力学性能
strain aging
pipeline steel
microstructure
mechanical properties
