正火型<strong>V-N-Ti</strong>和<strong>Nb-V-Ti</strong>海工钢焊接粗晶热影响组织和韧性研究

doi:10.11901/1005.3093.2020.206

材料研究学报

2020, Vol. 34

Issue (12): 939-948 DOI: 10.11901/1005.3093.2020.206

研究论文

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正火型V-N-Ti和Nb-V-Ti海工钢焊接粗晶热影响组织和韧性研究

师仲然¹^,²(

), 赵庆凯³, 刘登辉³, 王天琪¹^,², 柴希阳¹^,², 罗小兵¹^,², 柴锋¹^,²

^1.钢铁研究总院工程用钢研究所北京 100081
^2.国家新材料生产应用示范平台(先进海工与高技术船舶材料) 洛阳 471000
^3.中海石油(中国)有限公司天津分公司天津 300452

Study on Microstructure and Toughness of Simulated Coarse Grain Heated Zone in Normalized V-N-Ti and Nb-V-Ti Marine Steel

SHI Zhongran¹^,²(

), ZHAO Qingkai³, LIU Denghui³, WANG Tianqi¹^,², CHAI Xiyang¹^,², LUO Xiaobing¹^,², CHAI Feng¹^,²

^1.Department of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China
^2.National New Material Production and Application Demonstration Platform (Advanced Marine Engineering and High-tech Ship Materials), Luoyang 471000, China
^3.Cnooc China Limited Tianjing Branch, Tianjin 300452, China

引用本文:

师仲然, 赵庆凯, 刘登辉, 王天琪, 柴希阳, 罗小兵, 柴锋. 正火型V-N-Ti和Nb-V-Ti海工钢焊接粗晶热影响组织和韧性研究[J]. 材料研究学报, 2020, 34(12): 939-948.
Zhongran SHI, Qingkai ZHAO, Denghui LIU, Tianqi WANG, Xiyang CHAI, Xiaobing LUO, Feng CHAI. Study on Microstructure and Toughness of Simulated Coarse Grain Heated Zone in Normalized V-N-Ti and Nb-V-Ti Marine Steel[J]. Chinese Journal of Materials Research, 2020, 34(12): 939-948.

全文: PDF(7415 KB) HTML

摘要:

用焊接热模拟方法研究了V-N-Ti和Nb-V-Ti微合金化正火型海工钢模拟粗晶热影响区(CGHAZ)组织和韧性的变化规律。结果表明，组织的不同使V-N-Ti设计正火型海工钢的模拟CGHAZ韧性比Nb-V-Ti钢的好。对于V-N-Ti钢，较高的N含量提高了富Ti(Ti, V)(C, N)粒子析出温度和铁素体形核能力，使模拟CGHAZ原始奥氏体晶粒和(取向差角为15°)晶粒细化，并生成能阻止或使解理裂纹的偏转细小多边形铁素体，因此具有良好的低温韧性。而Nb-V-Ti钢模拟CGHAZ原奥氏体晶界上的链状M-A、粗大的原始奥氏体晶粒和有效晶粒尺寸，是模拟CGHAZ韧性差的原因。

关键词 ：金属材料, V-N-Ti钢, 正火型, 粗晶热影响区, 多边形铁素体

Abstract：

The microstructure and toughness of the simulated coarse grain heat affected zone (CGHAZ) of the normalized microalloying offshore steels V-N-Ti and Nb-V-Ti were investigated by means of a welding thermal simulator. The results show that the perculiar microstructure led to better CGHAZ toughness for the V-N-Ti steel. For V-N-Ti steel, the high N content increases the precipitation temperature of Ti-rich (Ti, V)(C, N) particles and the ferrite nucleation ability, so that refines the original austenite grain and decreases the effective grain size with high boundary tolerance angle 15^o, hence, the fine polygonal ferrite could efficiently deflect or even arrest the propagation of cleavage microcracks, so it had good low temperature CGAHZ toughness. While there exist chain-like M-A on original austenite grain boundaries, coarse original austenite grains and larger amount of fine grains with high boundary tolerance angle 15^o that may be responsible to the lower simulated CGHAZ toughness of Nb-V-Ti steel.

Key words： V-N-Ti steel normalized steel simulated CGHAZ polygonal ferrite

收稿日期: 2020-05-30

ZTFLH:

TG406

基金资助:山东省自然科学基金(ZR201911170022)

作者简介: 师仲然，男，1986年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.206 或 https://www.cjmr.org/CN/Y2020/V34/I12/939

表1 实验用钢的化学成分

图1 多层多道焊焊接热影响区组成的示意图

图2 焊接接头坡口的示意图

表2 双丝埋弧焊的焊接工艺参数

图3 焊接接头和焊接粗晶区的冲击功

图4 实验用钢模拟焊接粗晶区的显微组织

图5 实验用钢模拟焊接粗晶区M-A的TEM照片

图6 模拟粗晶热影响区原始奥氏体晶粒的形貌

图7 模拟粗晶热影响区的晶粒取向和取向差角分布

图 8 模拟粗晶热影响区析出粒子的TEM照片和尺寸统计

图9 实验用钢模拟粗晶热影响区在-60℃的冲击断口形貌

图10 实验用钢模拟粗晶热影响区的二次裂纹

图11 实验用钢析出第二相粒子质量百分数的热力学计算

图12 实验用钢模拟粗晶热影响区由大于15°晶界形成的有效晶粒尺寸

表3 实验用钢模拟粗晶热影响区M-A岛的统计结果

图13 V-N-Ti钢模拟粗晶热影响区的原始奥氏体晶界多边形铁素体组织

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