Effect of secondary peak temperature on microstructure and toughness in ICCGHAZ of laser-arc hybrid welded X100 pipeline steel joints
Effect of secondary peak temperature on microstructure and toughness in ICCGHAZ of laser-arc hybrid welded X100 pipeline steel joints
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二次峰值温度对激光电弧复合焊接X100管线钢接头ICCGHAZ组织和韧性的影响
DOI：
10.1016/j.jmrt.2020.05.016
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发表时间：
2020-07
期刊：
影响因子：
--
通讯作者：
Yuan Gao
中科院分区：
文献类型：
--
作者：
Xiaonan Qi;Hongshuang Di;Xiaonan Wang;Zhenguang Liu;R.D.K Misra;Pengcheng Huan;Yuan Gao
临界区粗晶热影响区（ICCGHAZ）是双道焊中的脆性区，其韧性受二次热循环峰值温度的影响。为阐明X100管线钢激光-电弧复合焊接接头中第二峰值温度对ICCGHAZ组织和冲击韧性的影响，进行了热模拟试验研究。结果表明，ICCGHAZ组织由回火马氏体和沿原奥氏体晶界沿着的二次热循环产物组成。在740 °C、790 °C和840 °C下，二次热循环的产物分别为项链型M-A组元、项链型板条马氏体和粒状贝氏体+针状铁素体。根据实验观察，提出了ICCGHAZ在不同次峰温度下的相变机制。激光-电弧复合焊接头ICCGHAZ的高半区（790℃ ~ 1000 ℃）比母材具有更高的冲击功。结果表明，二次热循环产物与基体之间的显微硬度差减小，从而降低了冲击过程中的应力集中和裂纹形核率。在840 °C下，晶格取向更加分散，并且大角度晶界的分数增加，这抑制了裂纹扩展。采用激光-电弧复合焊接方法焊接管线钢，可以有效地减小ICCGHAZ低韧性区的宽度，提高焊接接头的冲击功。
Intercritically reheat-coarse grained heat-affected zone (ICCGHAZ), as a brittle zone in double-pass welding, its toughness is affected by the peak temperature of the secondary thermal cycle. To elucidate the effect of secondary peak temperature on the microstructure and impact toughness of ICCGHAZ in laser-arc hybrid welded X100 pipeline steel joints, thermal simulation studies were carried out. The experimental results indicated that the microstructure of ICCGHAZ consisted of tempered martensite and products of secondary thermal cycle along the prior austenite grain boundaries. The products of secondary thermal cycle were necklace-type M-A constituent, necklace-type lath martensite and granular bainite + acicular ferrite at 740 °C, 790 °C and 840 °C, respectively. Based on experimental observations, transformation mechanism of ICCGHAZ at different secondary peak temperatures was proposed. The higher half zone(790℃∼Ac3) in ICCGHAZ of the laser-arc hybrid welded joint has a higher impact energy than the base metal. Consequently, microhardness difference between the products of secondary thermal cycle and matrix was reduced such that the stress concentration and crack nucleation rate was decreased during impact. The lattice orientation was more dispersed and fraction of high angle grain boundaries was increased at 840 °C, which suppressed crack propagation. The method of pipeline steel by laser-arc hybrid welding can effectively reduce the width of low toughness zone in ICCGHAZ and increase the impact energy of the welded joints.
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影响因子：
2.3
作者：
Xueda Li;C. Shang;Changchai Han;Yuran Fan;Jianbo Sun
通讯作者：
Xueda Li;C. Shang;Changchai Han;Yuran Fan;Jianbo Sun
影响因子：
2.1
作者：
F. Vollertsen;S. Grünenwald;M. Rethmeier;A. Gumenyuk;U. Reisgen;S. Olschok
通讯作者：
F. Vollertsen;S. Grünenwald;M. Rethmeier;A. Gumenyuk;U. Reisgen;S. Olschok
X100管线钢CGHAZ激光焊与电弧焊显微组织及断裂机理对比分析
DOI：
10.1007/s11665-019-04412-5
发表时间：
2019-11-04
影响因子：
2.3
作者：
Qi, Xiaonan;Di, Hongshuang;Liu, Zhenguang
通讯作者：
Liu, Zhenguang
影响因子：
0.6
作者：
Ş. Atapek;S. Gümüş;Ş. Polat
通讯作者：
Ş. Atapek;S. Gümüş;Ş. Polat
DOI：
10.1007/s40553-014-0036-3
发表时间：
2015-01
期刊：
Metallurgical and Materials Transactions E
影响因子：
--
作者：
Xueda Li;Xiaoping Ma;S. Subramanian;R. Misra;C. Shang
通讯作者：
Xueda Li;Xiaoping Ma;S. Subramanian;R. Misra;C. Shang