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金属学报  2017, Vol. 53 Issue (6): 657-668    DOI: 10.11900/0412.1961.2016.00403
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Mn、Ni、Mo含量对K65热煨弯管焊缝组织转变和低温韧性的影响
董利明1,2(),杨莉1,戴军1,张宇2,王学林3,尚成嘉3
1 常熟理工学院汽车工程学院 常熟 215500
2 江苏省(沙钢)钢铁研究院 张家港 215625
3 北京科技大学材料科学与工程学院 北京 100083
Effect of Mn, Ni, Mo Contents on Microstructure Transition and Low Temperature Toughness of Weld Metal for K65 Hot Bending Pipe
Liming DONG1,2(),Li YANG1,Jun DAI1,Yu ZHANG2,Xuelin WANG3,Chengjia SHANG3
1 College of Automotive Engineering, Changshu Institute of Technology, Changshu 215500, China
2 Institute of Research of Iron and Steel, Sha-Steel, Zhangjiagang 215625, China
3 College of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
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摘要: 

以Mn-Ni-Mo为主要合金体系,研制了K65热煨弯管用高强高韧埋弧焊丝。采用该焊丝制得的直缝管焊缝金属抗拉强度达741~768 MPa,显微硬度为231~250 HV10,-40 ℃冲击功为90~185 J;直缝管焊缝经热处理后,-40 ℃冲击功为65~124 J,比直缝管焊缝出现较大幅度下降。利用OM、LePera、SEM (EBSD)及TEM观察焊缝组织,研究焊缝中Mn、Ni、Mo含量对K65热煨弯管组织转变和低温韧性的影响。结果表明:直缝管焊缝中Mn、Ni含量的增加会促进针状铁素体的形成,适当增加Mo含量,降低Mn、Ni含量能使焊缝达到最佳强韧性能;经过热处理后,焊缝中针状铁素体含量降低,上贝氏体含量增加,大尺寸沿晶分布的渗碳体是焊缝金属低温韧性下降的原因,但Mo含量为0.2%时仍能保证大角度晶界比例达67.1%,使焊缝金属的-40 ℃低温韧性达124 J。

关键词 管线钢埋弧焊丝热煨工艺焊缝金属低温韧性针状铁素体    
Abstract

To increase transport efficiency and to lower the costs of pipeline construction, longitudinally submerged arc welded (LSAW) pipes with larger diameters and thicker walls have been increasingly used by the pipeline industry. For example, in Russia, the LSAW pipeline in the Bovanenkovo-Ukhta project was recently constructed with K65 steel (the highest grade of the Russian natural gas pipeline), which is similar in specifications and yield strength requirement (550 MPa grade) to API X80 but has a stricter low temperature toughness value of 60 J at -40 ℃ (compared to -20 ℃ for API X80 grade) due to the extreme Arctic environment. Although weld metal with acicular ferrite (AF) has been developed to meet the requirement of low temperature toughness, the main objective of the present work was to clarify the microstructural evolution and the resulting changes in mechanical properties after the bending process. Hot bending pipes are necessary links in the construction of pipeline lying, which make more strin gent standards for the strength and low temperature toughness. That puts forward a challenge especially to the weld bead because of the deterioration of toughness during the hot bending process. In this work, submerged arc welding wire with high strength and toughness was developed for K65 hot bending pipes, and the alloying elements of Mn, Ni, Mo were considered to estimate the microstructure evolution and the effect of low temperature toughness for the weld metal. The results showed the low temperature toughness at -40 ℃ reached 90~185 J and 65~124 J for weld metal of straight seam pipe and hot bending pipe respectively, which reflect the excellent role of alloying elements of Mn, Ni, Mo. Microstructure characterization revealed that the weld metal, which originally consisted mainly of AF in the as-deposited condition, became predominantly composed of bainitic ferrite (BF) after hot bending. In addition, the large size cementite along the grain boundary was also the reason for the deterioration of toughness. It is found that reaustenisation caused a small austenite grain-sized matrix, which brought about a very high volume fraction of bainite. However, the low temperature toughness for hot bending pipe was improved to 124 J for the weld metal with 0.2%Mo, in which about 67.1% of high angle grain boundary were found. It is clear that the process of reaustenitisation during the bending process plays an important role in successful microstructural design for the steel weld metals.

Key wordspipe line steel    submerged arc welding wire    hot bending process    weld metal    low temperature toughness    acicular ferrite
收稿日期: 2016-09-08      出版日期: 2017-03-30

引用本文:

董利明,杨莉,戴军,张宇,王学林,尚成嘉. Mn、Ni、Mo含量对K65热煨弯管焊缝组织转变和低温韧性的影响[J]. 金属学报, 2017, 53(6): 657-668.
Liming DONG,Li YANG,Jun DAI,Yu ZHANG,Xuelin WANG,Chengjia SHANG. Effect of Mn, Ni, Mo Contents on Microstructure Transition and Low Temperature Toughness of Weld Metal for K65 Hot Bending Pipe. Acta Metall, 2017, 53(6): 657-668.

链接本文:

http://www.ams.org.cn/CN/10.11900/0412.1961.2016.00403      或      http://www.ams.org.cn/CN/Y2017/V53/I6/657

图1  弯管热煨弯制备示意图
图2  热弯和回火的热模拟工艺及取样位置
Steel Rp0.5 Rm Z Impact energy / J
MPa MPa % T BM WM
Single Average Single Average
K65 555~665 ≥640 ≥18 -40 ≥150 ≥200 ≥42 ≥ 56
X80 555~690 ≥625 - -10 ≥140 ≥180 ≥80 ≥ 90
表1  K65和X80管线钢的技术要求对比[14]
Bead Wire-1 Wire-2 Wire-3 Wire-4 Welding Heat input
Current Voltage Current Voltage Current Voltage Current Voltage speed (η=0.9)
A V A V A V A V cmmin-1 kJcm-1
Inside 950 33 850 36 750 40 600 42 110 57.5
Outside 1200 33 900 36 800 40 650 40 120 58.5
表2  埋弧焊接工艺参数
图3  焊缝宏观形貌及测试位置示意图
图4  K65管线钢母材显微组织的OM像
No. C Si Mn Ni Mo P S Others Fe
1# 0.063 0.21 1.60 1.19 0.132 0.010 0.0046 0.305 Bal.
2# 0.063 0.21 1.60 1.39 0.127 0.011 0.0050 0.307 Bal.
3# 0.067 0.22 1.81 1.13 0.256 0.011 0.0054 0.301 Bal.
4# 0.068 0.23 1.99 1.17 0.191 0.011 0.0057 0.313 Bal.
表3  焊缝金属化学成分
No. Rp0.5 Rm Z Hardness / HV10
WM WM-QT
MPa MPa %
1# 583 723 21.8 231 230
2# 606 722 23.5 238 240
3# 647 714 22.0 244 253
4# 689 768 21.7 250 259
表4  焊缝金属拉伸性能和不同状态时的显微硬度
图5  焊态和热处理态焊缝的-40 ℃低温冲击功
图6  2#和3#焊缝焊态和热处理态的OM像
图7  3#焊缝金属热处理中间态(淬火态)及实际弯管焊缝的OM像
图8  3#焊态、淬火态和热煨弯管焊缝的原奥氏体晶界的OM像
图9  3#焊态、淬火态、淬火+回火态、热煨弯管焊缝经LePera试剂侵蚀的马氏体/奥氏体(M/A)的OM像
图10  3#焊缝金属不同状态下的M/A体积分数和平均尺寸
图11  3#焊缝热处理前后组织演变的TEM像
图12  3#焊缝焊态和热处理态的EBSD分析
图13  3#焊缝-40 ℃冲击断口形貌SEM像和焊态焊缝中夹杂物的EDS
图14  3#焊缝冲击断口附近的裂纹扩展形貌的OM像
图15  裂纹扩展和偏折示意图
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