[1]杨柳青,王 宏,隋永莉,等.自保护药芯焊丝焊缝组织及性能研究[J].焊管,2013,36(12):15-18.[doi:1001-3938(2013)12-0015-04]
 YANG Liuqing,WANG Hong,SUI Yongli,et al.Research on Weld Microstructure and Properties of Self-shielded Flux Cored Wire[J].,2013,36(12):15-18.[doi:1001-3938(2013)12-0015-04]
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自保护药芯焊丝焊缝组织及性能研究
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《焊管》[ISSN:1001-3938/CN:61-1160/TE]

卷:
36
期数:
2013年第12期
页码:
15-18
栏目:
试验与研究
出版日期:
2013-12-28

文章信息/Info

Title:
Research on Weld Microstructure and Properties of
Self-shielded Flux Cored Wire
文章编号:
1001-3938(2013)12-0015-04
作者:
杨柳青1王 宏2隋永莉1尹长华1赵海鸿1夏培培1
(1. 中国石油天然气管道科学研究院,廊坊 065000;
2. 石油天然气管道工程质量监督站,廊坊 065000)
Author(s):
YANG Liuqing1WANG Hong2SUI Yongli1YIN Zhanghua1ZHAO Haihong1XIA Peipei1
(1. China Petroleum Pipeline Institute,Langfang 065000,Hebei,China;
2. Quality Supervision Station of Oil & Gas Pipeline Project,Langfang 065000,Hebei,China)
关键词:
焊接X70管线钢焊缝自保护药芯焊丝组织性能
Keywords:
welding X70 pipeline steel weld self-shielded flux cored wire microstructure and properties
分类号:
TG422.3
DOI:
1001-3938(2013)12-0015-04
文献标志码:
B
摘要:
采用E71T8-Ni1J自保护药芯焊丝进行X70管线钢管半自动焊接,通过光谱分析、金相、扫描电镜、力学性能等试验手段,研究了X70管线钢管自保护药芯焊丝焊缝不同焊层及层间热影响区的组织特征和力学性能。试验结果表明,根焊组织主要由细小的等轴晶、板条马氏体和少量粒状贝氏体组成;填充焊层中可以观察到明显的奥氏体晶界,组织主要由准多边形铁素体、粒状贝氏体和M/A组元组成;层间热影响区组织由少量准多边形铁素体、粒状贝氏体、M/A组元以及沿奥氏体晶界连续分布的“项链状”M/A组成。焊缝的抗拉强度为720~750 MPa,-20 ℃夏比冲击功为78~128.5 J。层间热影响区组织中沿晶界分布的“项链状”M/A、晶内粒状贝氏体板条间形成的平行排列的条状M/A组元以及焊缝中粗大不均匀的组织会降低焊缝的韧性。
Abstract:
Adopting E71T8-Ni1J self-shielded flux cored wire to conduct semi-automatic welding for X70 line pipe,the weld microstructure characteristics and mechanical properties of different welding layer and interlayer HAZ of self-shielded flux cored wire were investigated by spectrum analysis, metallographic microscope, scanning electron microscopy(SEM) and mechanical properties test. The experimental results showed that the microstructure of root welding mainly consists of fine equiaxed grains, a small amount of granular bainite(GB) and lath martensite; obvious austenite grain boundaries can be observed on filling welding layer, and the microstructure is mainly composed of quasi-polygonal ferrite, granular bainite and M/A constituents; the heat affected zone(HAZ) microstructure of the welding layer is composed of quasi-polygonal ferrite, granular bainite, M/A constituents and the chain-like M/A constituents distributing continuously along the austensite boundaries. The tensile strength of the weld metal is between 720 MPa and 750 MPa, and charpy impact energy is 78~128.5 J at -20 ℃. The chain-like  M/A distributing along the grain boundaries, the parallel arrangement of strip M/A between transgranular granular bainite lath in the weld layer HAZ, and rough and uneven weld metal microstructure will reduce the toughness of weld metal.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2013-07-19
作者简介:杨柳青(1981—),男,山西人,博士后,主要从事管线钢材料和焊接方面的研究工作。
更新日期/Last Update: