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河北省自然科学基金(E2011203169)

作品数:6 被引量:53H指数:4
相关作者:乔桂英廖波肖福仁李建龙谷雨更多>>
相关机构:燕山大学中国石油更多>>
发文基金:河北省自然科学基金国家自然科学基金更多>>
相关领域:金属学及工艺一般工业技术化学工程更多>>

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焊缝形状对双面焊焊接接头拉伸断裂位置的影响被引量:5
2014年
使用ANSYS有限元数值模拟软件建立双面埋弧焊钢管接头拉伸变形模型,并通过实验验证了该模型的合理性。在此模型的基础上,研究了焊缝的形状对焊接接头拉伸断裂位置的影响。结果表明:外焊缝熔宽存在3个临界值,其值的大小对焊接接头拉伸断裂位置的变化规律有着重要影响,为提高高强管线钢管焊缝质量、优化焊接工艺提供了理论依据。
乔桂英乔猛孙利娜韩秀林肖福仁
关键词:焊缝熔宽管线钢管
高Nb微合金钢连续冷却转变行为的研究被引量:3
2013年
采用Gleeble-3500型热模拟试验机,测定一种高Nb微合金钢的变形前后及变形弛豫后的CCT曲线,并测定了奥氏体化、变形弛豫前后钢中固溶Nb的含量,分析了变形及弛豫对CCT曲线及组织的影响,结果表明:变形促进相变,使CCT曲线向左上方移动,并细化室温组织。变形后弛豫过程中,由于回复、再结晶的发生,降低了奥氏体的形变储能,降低了变形对组织的细化作用,使室温组织粗化。此外,Nb的析出降低了奥氏体中固溶Nb、C的含量,从而减弱了对相变的抑制作用,使相变温度升高。
曹雅彬肖福仁乔桂英廖波
关键词:NB微合金钢CCT曲线弛豫
Effect of Nb Solute and NbC Precipitates on Dynamic or Static Recrystallization in Nb Steels被引量:22
2012年
Nb is often considered to be a powerful alloying element for controlling the recrystaUization process in mi- croalloyed high strength steels. However, Nb can be presented either as solute in solution, where it is thought to ex- hibit a strong solute drag effect, or as NbC precipitates, which are thought to be effective at pinning grain bounda- ries. Therefore, it is very important to quantitatively measure Nb in solution or in NbC precipitates. A quantitative analysis method of Nb in solution and in precipitates was proposed. The test procedure involved chemical dissolution, filtration and inductively coupled plasma atomic emission spectroscopic (ICP-AES) analysis. The amount of Nb in solution in Nb-microallyed steels under different treatment conditions was evaluated. The results show that the niobium and carbon contents in steels have a great effect on niobium dissolution kinetics. The solute Nb is more effective to retard dynamic recrystallization, while the NbC precipitates are more effective to inhibit static recrystaltization. The results may help to comprehend effect of Nb in steels, and provide some guides in the design of new high strength Nb-bearing steels.
XIAO Fu-renCAO Ya-binQIAO Gui-yingZHANG Xiao-bingLIAO Bo
关键词:PRECIPITATIONRECRYSTALLIZATION
Quantitative Research on Dissolving of Nb in High Nb Microalloyed Steels during Reheating被引量:1
2014年
The accurate prediction of soluble Nb content during reheating is helpful for the design of chemical compo sition and reheating parameters for Nb-containing steels. The dissolution behavior of Nb in high Nb mieroailoyed steels was investigated. The results show that Nh does not entirely dissolve for high Nb microalloyed steels containing Ti after holding at 1 300 ℃ for 3 h. The soluble Nb content increases with the decrease of C content and/or the increase of Nb content in steels. Moreover, an expression has been established to describe the amount evolution of soluble Nb in high Nb microalloyed steels during reheating and the validity of this expression has also been verified by experiment.
Ya-bin CAOFu-ren XIAOGui-ying QIAOBo LIAO
关键词:DISSOLVING
Effect of Nb on Mechanical Properties of HAZ for High-Nb X80 Pipeline Steels被引量:16
2013年
The mechanical properties of heat affected zone (HAZ) of two commercial high-Nb X80 grade pipeline steels with different alloy elements were investigated using thermal simulation performed on a Gleeble-3500 thermal simulator. The results showed that the high-Nb steels have excellent weldability. Ernbrittlement regions appear in coarse grain heat affected zone (CGHAZ) and intercritically heat affected zone (ICHAZ) ~ Softening region appears in fine-grain heat affected zone (FGHAZ), and the strength here was even lower than 555 MPa as required in the standard. Meanwhile, with the increase of heat input, the strength and the toughness of HAZ of steel with high Nb, C and lower alloy decrease notably. Therefore, take into account the welding procedure during manufacture of weld pipe, suitable amount of alloy elements, such as Cr, Ni, Cu, Mo and so on, is necessary for high Nb X80 heavy- thick steel plate.
CHEN Xiao-weiLIAO BoQIAO Gui-yingGU YuWANG XuXIAO Fu-ren
关键词:HAZMICROSTRUCTURE
X100管线钢焊接热影响区组织与韧性研究被引量:7
2011年
采用热模拟试验技术,研究了X100管线钢焊接热影响区的组织与性能变化规律,结果表明:采用高Nb、微Ti设计的低碳X100管线钢的焊接粗晶区经焊接热循环后仍保持良好的韧性。焊接热影响区的脆化区出现在峰值温度为750℃的两相区。沿原奥氏体晶界形成的岛状组织是导致韧性降低的主要原因。
乔桂英李建龙李建一田鹏谷雨廖波
关键词:X100管线钢焊接热影响区
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