The effect of the hot induction bending process on the microstructure and mechanical properties of the start bending point for high-strength bends was investigated. Acicular ferrite (AF) is found to be absent in the microstructure of the start bending point. After whole heating process, the microstructure is composed of lath bainite (LB) and quasi-polygonal ferrite (QPF), with an impact absorbed energy of 202 J cm−2 and a strength is very similar to that of the baseline pipe. After local heating process, the impact absorbed energy is 103 J cm−2, which is lower than that of the baseline pipe. For thick-walled high-strength pipeline steel, the whole heating process is determined to be the optimum heat treatment for guaranteeing excellent strength and toughness combination.
ZongCZhuGMaoW.Effect of crystallographic texture on the anisotropy of Charpy impact behavior in pipeline steel. Mater Sci Eng A. 2013;563:1–7.
2.
WangWShanYYangK.Study of high strength pipeline steels with different microstructures. Mater Sci Eng A. 2009;502(1–2):38–44.
3.
MuránskyOŠittnerPZrníkJIn situ neutron diffraction investigation of the collaborative deformation–transformation mechanism in TRIP-assisted steels at room and elevated temperatures. Acta Mater. 2008;56(14):3367–3379.
4.
KimYWSongSWSeoSJDevelopment of Ti and Mo micro-alloyed hot-rolled high strength sheet steel by controlling thermomechanical controlled processing schedule. Mater Sci Eng A. 2013;565:430–438.
5.
reza HajibagheriHHeidariAAminiR.An experimental investigation of the nature of longitudinal cracks in oil and gas transmission pipelines. J Alloys Compd. 2018;741:1121–1129.
6.
YuanGHuWWangXThe relationship between microstructure, crystallographic orientation, and fracture behavior in a high strength ferrous alloy. J Alloys Compd. 2017;695:526–539.
7.
ShibanumaKHosoeTYamaguchiHCrack tip opening angle during unstable ductile crack propagation of a high-pressure gas pipeline. Eng Fract Mech. 2018;204:434–453.
8.
OikonomidisFShterenlikhtATruman CE.Prediction of crack propagation and arrest in X100 natural gas transmission pipelines with the strain rate dependent damage model (SRDD). Part 1: A novel specimen for the measurement of high strain rate fracture properties and validation of the SRDD model parameters. Int J Press Vessels Pip. 2013;105:60–68.
9.
OikonomidisFShterenlikhtATrumanCE.Prediction of crack propagation and arrest in X100 natural gas transmission pipelines with a strain rate dependent damage model (SRDD). Part 2: large scale pipe models with gas depressurisation. Int J Press Vessels Pip. 2014;122:15–21.
10.
ShinSYWooKJHwangBFracture-toughness analysis in transition-temperature region of Three American Petroleum Institute X70 and X80 pipeline steels. Metall Mater Trans A. 2009;40(4):867–876.
11.
ZhouPWangBWangLEffect of welding heat input on grain boundary evolution and toughness properties in CGHAZ of X90 pipeline steel. Mater Sci Eng A. 2018;722:112–121.
12.
WangLWangBZhouP.Misorientation, grain boundary, texture and recrystallization study in X90 hot bend related to mechanical properties. Mater Sci Eng A. 2018;711:588–599.
13.
ZhaoWWangWChenSEffect of simulated welding thermal cycle on microstructure and mechanical properties of X90 pipeline steel. Mater Sci Eng A. 2011;528(24):7417–7422.
14.
WangBWangLJiangYMicrostructure and mechanical behavior of X90 bend using local induction bending. Trans Indian Inst Met. 2017;70(1):115–124.
15.
SungHKShinSYHwangBEffects of cooling conditions on microstructure, tensile properties, and charpy impact toughness of low-carbon high-strength bainitic steels. Metall Mater Trans A. 2013;44(1):294–302.
16.
WuXLeeHKimYMEffects of processing parameters on microstructure and properties of ultra high strength linepipe steel. J Mater Sci Technol. 2012;28(10):889–894.
17.
TianYLiQWangZEffects of ultra fast cooling on microstructure and mechanical properties of pipeline steels. J Mater Eng Perform. 2015;24(9):3307–3314.
KimYMShinSYLeeHEffects of molybdenum and vanadium addition on tensile and charpy impact properties of API X70 linepipe steels. Metall Mater Trans A. 2007;38(8):1731–1742.
20.
KimYWKimJHHongSGEffects of rolling temperature on the microstructure and mechanical properties of Ti–Mo microalloyed hot-rolled high strength steel. Mater Sci Eng A. 2014;605:244–252.
21.
XiaDWangXLiXProperties and microstructure of thirdgeneration X90 pipeline steel. Acta Metall Sin. 2013;49(3):271–276.
22.
AnijdanSHMYueS.The necessity of dynamic precipitation for the occurrence of no-recrystallization temperature in nb-microalloyed steel. Mater Sci Eng A. 2011;528(3):803–807.
23.
AnijdanSHMSediakoDYueS.Optimization of flow stress in cool deformed Nb-microalloyed steel by combining strain induced transformation of retained austenite, cooling rate and heat treatment. Acta Mater. 2012;60(3):1221–1229.
24.
AnijdanSHMYueS.The effect of cooling rate, and cool deformation through strain-induced transformation, on microstructural evolution and mechanical properties of microalloyed steels. Metall Mater Trans A. 2012;43(4):1140–1162.
25.
WuDHanXTianHMicrostructural characterization and mechanical properties analysis of weld metals with two Ni contents during post-weld heat treatments. Metall Mater Trans A. 2015;46(5):1973–1984.
26.
WangXXiaoFFuYMaterial development for grade X80 heavy-wall hot induction bends. Mater Sci Eng A. 2011;530:539–547.
27.
WangXLiaoBWuDEffects of hot bending parameters on microstructure and mechanical properties of weld metal for X80 hot bends. J Iron Steel Res Int. 2014;21(12):1129–1135.
28.
ZhouTYuHHuJStudy of microstructural evolution and strength–toughness mechanism of heavy-wall induction bend pipe. Mater Sci Eng A. 2014;615:436–446.
29.
WangXLTsaiYTYangJRInvestigation of the microstructure and toughness of 550 MPa grade pipeline after the hot-bending process. Mater Sci Technol. 2016;32(7):664–674.
30.
NishiokaKIchikawaK.Progress in thermomechanical control of steel plates and their commercialization. Sci Technol Adv Mater. 2012;13(2):023001.
31.
YakubtsovIAPoruksPBoydJD.Microstructure and mechanical properties of bainitic low carbon high strength plate steels. Mater Sci Eng A. 2008;480(1-2):109–116.
32.
ZhaoJHuWWangXEffect of microstructure on the crack propagation behavior of microalloyed 560 MPa (X80) strip during ultra-fast cooling. Mater Sci Eng A. 2016;666:214–224.
33.
SunLMuszkaKWynneBPEffect of strain path on dynamic strain-induced transformation in a microalloyed steel. Acta Mater. 2014;66:132–149.
34.
PriestnerRDeArdoAJRatzGAThermomechanical processing of microalloyed austenite. Warrendale (PA): Metallurgical Society of AIME; 1982. p. 455.
35.
BeladiHKellyGLShokouhiAThe evolution of ultrafine ferrite formation through dynamic strain-induced transformation. Mater Sci Eng A. 2004;371(1-2):343–352.
36.
KimYGHwangBLeeSDynamic deformation and fracture behavior of ultrafine-grained aluminum alloy fabricates by equal-channel angular pressing. Metall Mater Trans A. 2005;36(11):2947–2955.
37.
HanSYShinSYLeeSEffects of cooling conditions on tensile and charpy impact properties of API X80 linepipe steels. Metall Mater Trans A. 2010;41(2):329–340.
38.
SungHKShinSYHwangBEffects of rolling and cooling conditions on microstructure and tensile and Charpy impact properties of ultra-low-carbon high-strength bainitic steels. Metall Mate Trans A. 2011;42(7):1827–1835.
39.
GuoHLiQFanYBainite transformation behavior, microstructural feature and mechanical properties of nanostructured bainitic steel subjected to ausforming with different strain. J Mater Res Technol2020;9(4):9206–9218.
40.
HuJDuLXWangJJStructure–mechanical property relationship in low carbon microalloyed steel plate processed using controlled rolling and two-stage continuous cooling. Mater Sci Eng A. 2013;585:197–204.
41.
GloverAZhouJHorsleyDDesign, application and installation of an X100 pipeline. Int Conf Offshore Mech Arctic Eng. 2003;36835:307–318.
42.
HwangBShinSYLeeSEffect of microstructure on drop weight tear properties and inverse fracture occurring in hammer impacted region of high toughness X70 pipeline steels. Mater Sci Technol. 2008;24(8):945–956.
43.
ShinYTKangSWLeeHW.Fracture characteristics of TMCP and QT steel weldments with respect to crack length. Mater Sci Eng A. 2006;434(1-2):365–371.
44.
HuJDuLXXieHMicrostructure and mechanical properties of TMCP heavy plate microalloyed steel. Mater Sci Eng A. 2014;607:122–131.
