|
|
Effect of Heat Input on Microstructure and Impact Property of HAZ of Offshore Steel Plate EQ47 |
PAN Xin,ZHANG Yu,LI Xiao-bao,BAO Bing-hui |
Institute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625, Jiangsu, China |
|
|
Abstract Gleeble simulation and multi-pass gas metal arc welding (GMAW) method were employed to investigate the effect of heat input on microstructure and impact property of heat affect zone (HAZ) of EQ47. Coarse grained HAZ (CGHAZ) simulation results show that: with t8/5≤6s(17kJ/cm) the CGHAZ composed of a lath martensite (LM) microstructure shows an impact toughness >200J at -40℃; with t8/5 13s(25kJ/cm), formation of upper bainite (UB) are found and the impact toughness decreased to 100J at -40℃; with increasing t8/5 to 20s(30kJ/cm), coarsening of UB occurred, which results in deterioration of impact toughness to <30J at -40℃. Inter-critically CGHAZ (ICCGHAZ) simulation results show that: formation of M-A constituents along the grain boundary deteriorated impact property, and ICCGHAZ impact toughness at -40℃ decreased from 100J at t8/5 of 6s to 37J and 21J at t8/5 of 13s and 20s, respectively. GMAW results show that the impact property of CGHAZ decreased from 134-215J to 39-95J with increased heat input from 17 to 25kJ/cm, which correspond well with simulation results. It is found from both simulation and GMAW results that, the welding heat input should be controlled ≤17kJ/cm to achieve satisfactory HAZ impact toughness.
|
Received: 19 August 2012
Published: 18 June 2013
|
|
|
|
|
[1] |
狄国标,刘振宇,郝利强,刘相华.海洋平台用钢的生产现状及发展趋势[J][J].机械工程材料,2008,32(8):1-3
|
[2] |
邹家仁,钱建民,李华其.海洋工程用钢的焊接技术现状及发展[J].江苏船舶,2011,28(3):35-44
|
[3] |
左波,张玉凤,霍立兴,等.海洋平台大厚度焊接接头断裂韧度[J].焊接学报,2004,25(6):66-81
|
[4] |
粟京,刘华祥,马涛,等.海洋平台用钢及其焊接接头的韧性研究[J].船海工程,2010,39(5):234-237
|
[5] |
马涛,陈刚,王琦,严铿,邹家生.焊接工艺对EQ56高强钢接头性能的影响[J].焊接技术,2010,39(9):28-30
|
[6] |
马涛,陈刚,王琦,严铿,邹家生.海洋平台用EQ70高强钢焊接性研究[J].江苏科技大学学报(自然科学版),2011,25(1):27-30
|
[7] |
高惠临,董玉华.超低碳QT钢焊接二次热循环的组织转变与局部脆化[J].金属学报,2001,37(1):34-38
|
[8] |
KOHYA,JKIM,K.YOKOYAMA,M.NAGUMO.Microstructures relevant to brittle fracture initiation at the heat-affected zone of weldment of a low carbon steel[J].Metallurgical and Materials Transactions A,1996,27A:2574-2582
|
[8] |
KOHYA,JKIM,K.YOKOYAMA,M.NAGUMO.Microstructures relevant to brittle fracture initiation at the heat-affected zone of weldment of a low carbon steel[J].Metallurgical and Materials Transactions A,1996,27A:2574-2582
|
[9] |
S.LEE,BC.KIM,D. KWON.Fracture toughness analysis of heat-affected zones in high-strength low-alloy steel welds[J].Metallurgical Transactions A,1993,24A:1133-1141
|
[9] |
S.LEE,BC.KIM,D. KWON.Fracture toughness analysis of heat-affected zones in high-strength low-alloy steel welds[J].Metallurgical Transactions A,1993,24A:1133-1141
|
[10] |
Xiaoyong Zhang,Huilin Gao.A study of impact toughness of intercritically reheated coarse-grain heat effected zone of two type X80 grade pipeline steel[R][J].WES2011,2011,:101-104
|
[10] |
Xiaoyong Zhang,Huilin Gao.A study of impact toughness of intercritically reheated coarse-grain heat effected zone of two type X80 grade pipeline steel[R][J].WES2011,2011,:101-104
|
[11] |
B.de Meester.The weldability of morden structural TMCP steels[R][J].ISIJ International,1997,37(6):537-551
|
[11] |
B.de Meester.The weldability of morden structural TMCP steels[R][J].ISIJ International,1997,37(6):537-551
|
[12] |
周志良,刘书华,谢明.局部脆性区对直接淬火回火钢焊接热影响区断裂韧性的影响[J].焊接学报,1998,19(3):147-153
|
[12] |
周志良,刘书华,谢明.局部脆性区对直接淬火回火钢焊接热影响区断裂韧性的影响[J].焊接学报,1998,19(3):147-153
|
[1] |
NIU Yan-long, LIU Qing-you, JIA Shu-jun, TONG Shuai, WANG Bing, REN Yi. Influence of microstructure and M/A island evolution on toughness of pipeline steel under controlled cooling process[J]. Iron and Steel, 2020, 55(6): 91-100. |
[2] |
GAN Gui-ping,YE Jiang,FAN Lei. Effect of tempering treatment on microstructure and low temperature toughness of a low carbon bainite steel[J]. JOURNAL OF IRON AND STEEL RESEARCH , 2020, 32(3): 258-264. |
[3] |
DUAN He, SHAN Yi-yin, YANG Ke, SHI Xian-bo, YAN Wei, REN Yi. Experimental on process, microstructure and mechanical properties of X80 high strength pipeline steel for low temperature[J]. Iron and Steel, 2020, 55(2): 103-111. |
[4] |
WANG Changshun,GUO Fujian,LI Guanglong,SHANG Chengjia. Influence of central segregation control on #br# low temperature toughness of steel[J]. Iron and Steel, 2019, 54(8): 202-208. |
[5] |
ZHOU Cheng, ZHAO Tan, ZHU Long-hao,JIN Yao-hui, LI Jia-an. Effect of TMCP on microstructure evolution and mechanical properties of low-carbon Ni-Nb steel[J]. Iron and Steel, 2019, 54(4): 68-72. |
[6] |
WANG Bing- xing,WU Zhong- zi,LOU Hao- nan,WANG Chao,WANG Zhao- dong,WANG Guo- dong. Effect of oxide metallurgy on microstructure and properties of HAZ in EH36 steel[J]. , 2019, 31(2): 239-245. |
|
|
|
|