显微组织对厚规格高强度管线钢DWTT性能的影响  

Effect of Microstructure on DWTT Properties of Thick-Walled High Strength Pipeline Steels

作　　者：张豪臻 章传国[1] 孙磊磊[1] ZHANG Haozhen;ZHANG Chuanguo;SUN Leilei(Central Research Institute(R&D Center),Baoshan Iron&Steel Co.,Ltd.,Shanghai 201900,China)

机构地区：[1]宝山钢铁股份有限公司中央研究院,上海201900

出　　处：《热加工工艺》2021年第24期25-27,31,共4页Hot Working Technology

基　　金：上海市优秀学术/技术带头人计划资助项目(19XD1430100);国家重点研发项目(2018YFC0310304)。

摘　　要：以厚规格X80管线钢为试验对象,通过落锤撕裂试验和显微组织观察,研究了组织中多边形铁素体的含量和晶粒大小对DWTT性能的影响。结果表明,随着多边形铁素体体积含量的增加,DWTT的性能指标-断口剪切面积百分比呈先上升后下降的变化规律,且在多边形铁素体含量接近30%时达到峰值。当组织中多边形铁素体含量较多;超过40%以后,多边形铁素体的晶粒大小对DWTT性能有较大影响,晶粒尺寸小的DWTT性能明显较好。The effects of polygonal ferrite content and grain size on DWTT properties were investigated for thick-walled X80 pipeline steels by DWTT(drop weight tear test)and metallographic analysis.The results indicate that with the increase of polygonal ferrite content,the shear-area percentage of DWTT fracture first increase and then decrease,reaching its maximum when the polygonal ferrite content is approximately 30%;and when the polygonal ferrite content is more than 40%,the grain size of polygon ferrite has a great influence on the DWTT performance,and the performance of DWTT with small grain size is obviously better.

关 键 词：管线钢 X80 DWTT 断口剪切面积百分比 多边形铁素体 

分 类 号：TG142.1[一般工业技术—材料科学与工程]