延迟加速冷却对X100管线钢的组织和性能的影响  

Influence of Delay Accelerated Cooling on the Microstructure and Property of X100 Pipeline Steel

作　　者：程时遐[1] 张骁勇[1] 高惠临[1] 

机构地区：[1]西安石油大学材料科学与工程学院,陕西西安710065

出　　处：《材料科学与工程学报》2014年第3期431-435,371,共6页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(51174165)

摘　　要：利用热模拟、力学性能测试和材料显微分析等实验技术,研究了X100管线钢在延迟加速冷却条件下的组织与性能的变化规律。研究表明,通过延迟加速冷却,X100管线钢可获得贝氏体+铁素体(B+F)双相组织。随着始冷温度的上升,试验钢的B含量增加,F含量降低,导致材料屈服强度上升,塑性下降。当始冷温度为530℃时,X100管线钢有较低的屈强比,较大的均匀伸长率和较大的形变强化指数,符合大变形管线钢的技术要求。通过延迟加速冷却方法获得的细小的B板条和较高位错密度的F,赋于材料较高的强韧特性和优良的大变形能力。Relationship between microstructure and properties for X100 pipeline steel after delay accelerated cooling(DAC)was investigated through thermal simulation,mechanical property test and microscopic analysis method.The results show that(B+F)dual-phase microstructure can be obtained by DAC.With the increase of starting cooling temperature,the content of bainite increases and the content of ferrite decreases,leading to the increase of yield strength and the reduction of plasticity of the steel.When starting cooling temperature is 530℃,lower yield ratio,higher uniform elongation and higher strain hardening exponent of the steel can be achieved,which meet the technical requirements to high deformation pipeline steel. Bainite with fine lath and ferrite with high dislocation density can be acquired through DAC,which endow the steel with higher strength-toughness and good deformability.

关 键 词：X100管线钢 延迟加速冷却 始冷温度 组织和性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]