Wei Deng
材料科学技术（英）
In this study, two API X80 pipeline steels were fabricated by varying Ti additions, and their microstructures and fracture characteristics were analyzed to investigate the effects of Ti-enriched carbonitride on the tensile properties and Charpy impact properties. Lathy bainite, a mass of matensite/austenite (M/A), coarse cubic Ti-enriched inclusions, chain-typed Ti-enriched precipitations, weak toughness and high tensile strength were found as consequences of higher amount of Ti content. Those large scale and chain-typed Ti-enriched carbonitrides are one kind of crack sources during fracture. The negative e®ect of higher amount of Ti on the impact properties is increased with decreased temperature.
关键词:
X80 pipeline steel
,
富Ti碳氮化物
,
M/A岛
,
冲击韧性
Wei Deng
材料科学技术（英）
In this study, two API X80 pipeline steels were fabricated by varying Ti additions, and their microstructures and fracture characteristics were analyzed to investigate the effects of Ti-enriched carbonitride on the tensile properties and Charpy impact properties. Lathy bainite, a mass of matensite/austenite (M/A), coarse cubic Ti-enriched inclusions, chain-typed Ti-enriched precipitations, weak toughness and high tensile strength were found as consequences of higher amount of Ti content. Those large scale and chain-typed Ti-enriched carbonitrides are one kind of crack sources during fracture. The negative e®ect of higher amount of Ti on the impact properties is increased with decreased temperature.
关键词:
X80 pipeline steel
,
富Ti碳氮化物
,
M/A岛
,
冲击韧性
Xiaohuai XUE
,
Luhai WU
,
Bainian QIAN
,
Jingli LI
,
Songnian LOU
材料科学技术（英）
X80 pipeline steel produced by TMCP has high strength and high toughness with ultrafine grain microstructure. The microstructure coarsens and the toughness worsens at the coarse grained (CG) HAZ apparently after weld simulation. The experimental results indicated that the bainitic ferrite and the second phases formed at cooling are differently as the variation of carbon in base metal. In low carbon steels, the bainitic ferrite laths are long and narrow, the second phases are complex including residual austenite, martensite, the M-A constituent and the Fe3C carbide. The formation of Fe3C carbide is the main reason of the poor toughness in CG HAZ. The ultralow carbon in base metal, however, can improve the CG HAZ toughness through restraining the formation of carbides, decreasing the M-A constituent, increasing the residual austenite content, which are beneficial to the CG HAZ toughness.
关键词:
X80 pipeline steel
,
null
,
null
,
null
,
null
孔德军
,
龙丹
,
吴永忠
,
叶存冬
材料工程
doi:10.3969/j.issn.1001-4381.2013.06.010
对X80管线钢埋弧焊焊接接头进行了-80～20℃温度范围的夏比冲击实验.测试了其冲击吸收功和脆性断面率,用扫描电镜观察了其断口形貌,分析了焊接接头断裂形式和断口形貌,讨论了焊接接头的韧脆转变温度和冲击断裂的力学行为.结果表明,室温时断口为韧窝状分布,焊接接头的韧脆转变温度为-28℃；断口形貌由韧性断裂向脆性断裂转变,断口主要表现为解理断裂.
关键词:
X80管线钢
,
焊接接头
,
冲击韧性
,
韧脆转变温度
,
断口形貌
沈丽霞
,
杨霜
,
王雪里
,
赵春英
电镀与精饰
doi:10.3969/j.issn.1001-3849.2015.07.003
通过线性极化、动电位极化和交流阻抗等电化学测试方法研究腐蚀产物膜对X80钢腐蚀行为的影响,采用电子扫描显微镜和X-射线衍射仪对X80钢在鹰潭酸性红壤模拟溶液中浸泡不同周期后的表面腐蚀产物膜进行微观形貌观察.结果表明,腐蚀产物膜主要由Fe3 O4和FeO(OH)组成,覆盖有腐蚀产物膜试样的电荷转移电阻、极化率及容抗孤半径均比处于全浸周期试样的小,腐蚀产物膜明显加速了X80钢在酸性红壤溶液中的腐蚀速率.
关键词:
X80管线钢
,
腐蚀产物膜
,
电化学腐蚀行为
,
鹰潭酸性红壤
刘靖
,
彭杰
,
张备
,
韩静涛
,
张双平
机械工程材料
通过金相观察和萃取复型的方法，研究了X80管线钢在不同加热温度下奥氏体晶粒长大规律及第二相粒子的溶解规律。结果表明：随加热温度升高，奥氏体晶粒逐渐长大，当温度达1150℃时，晶粒急剧增大；当加热温度达到1200℃时，铌的碳氮化物几乎全部溶解于基体中。
关键词:
X80管线钢
,
奥氏体晶粒尺寸
,
微合金元素
,
固溶
袁玮
,
黄峰
,
胡骞
,
刘静
,
侯震宇
中国腐蚀与防护学报
运用电化学噪声测试技术,结合动电位极化方法研究了外加拉应力对X80管线钢在NaHCO3+ NaCl体系中点蚀电化学行为的影响.结果表明,较小的外加拉应力(σ≤100 MPa)对X80管线钢点蚀的发生有抑制作用,且抑制作用随应力的增大而增大；较大的外加拉应力(σ≥200 MPa)对X80管线钢点蚀的发生有促进作用,且促进作用随应力的增大而增大.
关键词:
动电位极化
,
电化学噪声
,
X80管线钢
,
点蚀电化学行为
