Influence of martensite-austenite (MA) on impact toughness of X80 line pipe steels

Huda, Nazmul; Midawi, Abdelbaset R.H.; Gianetto, J. A.; Lazor, Robert; Gerlich, A.P.

doi:10.1016/j.msea.2016.03.095

Cited by 108 publications

(45 citation statements)

References 35 publications

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“…This was because of the negative effect of the blocky M-A constituent formed on prior austenite grain boundaries. Similar observations were reported by Huda et al 315 on Nb-Ti-V, X80 line pipe steels, based on earlier work. [316][317][318] HAZ toughness is well recognized as being influenced by  undissolved TiN particles at the peak welding temperatures and  amount of free nitrogen present in the steel during the weld thermal cycle.…”

Section: Fig52 Near Heresupporting

confidence: 91%

Titanium microalloyed steels

Baker

2018

Ironmaking & Steelmaking

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For many years titanium has been regarded as a relative minor element in microalloyed steels compared with niobium and vanadium. However, over the past decade or so, titanium compounds in microalloyed steels have been recognized as having a wider role than just involved in austenite grain refinement.This is considered in the present review. The background and brief history are followed by sections dealing with the physical state of titanium and compounds of titanium, including borides, carbides, nitrides, oxides and sulphides characterized in MA steels. Many of the investigations on the solubility of these compounds in iron, and the precipitates they form, are considered, which leads to their functions in controlling the mechanical and toughness properties of MA steels.This now often involves the multiple alloying additions of titanium, niobium and vanadium with both carbon and nitrogen, and the morphologies of the various precipitates characterized in MA steels is presented. Titanium has become an important element in the development of line pipe steels, which for the higher grades have moved to bainite/acicular ferrite microstructures. The influence of Ti in the nucleation of acicular ferrite is an active research area, particularly with regard to the use made of titanium compounds in welding of MA steels. Finally, consideration is given to the influence of titanium on hot ductility and how titanium additions behave during continuious casting and thin slab direct charging processes.

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Section: Fig52 Near Heresupporting

confidence: 91%

Titanium microalloyed steels

Baker

2018

Ironmaking & Steelmaking

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“…This was because of upper bainite and MA produced in the CGHAZ [38]. It is consistent with the results that the toughness of the CGHAZ is lower than that of other areas [39,40]. The Charpy absorbed energy of all specimens showed higher value than the minimum limit of absorbed energy, 27 J, suggested by the industrial standard [3].…”

Section: Mechanical Propertiessupporting

confidence: 88%

Weldability and Lamellar Tearing Susceptibility of High-Strength SN 490C Steel Plates

Van

Lee

Kim

et al. 2019

Metals

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In this study, weldability and cracking susceptibility of SN 490C steel were firstly investigated. For this study, SN 490C thick plates which had been developed for anti-seismic steel of building structures were welded by flux-cored arc welding (FCAW) and submerged arc welding (SAW) processes based on welding conditions of actual construction site. Weldments using the plates with different thickness were produced using E71T-1C and EH14 filler wires, respectively. For the weldability tests, various welded joints such as butt and T-joints were examined. After welding, microstructure analysis was performed. Various microstructures were found depending on the location of the weldments. Heat effects by multi-pass welding were correlated with the microstructure. The microstructure was correlated with the hardness profile and the impact test result. In addition, the through-thickness tensile test, window test, and Cranfield test were conducted to evaluate sensitivity of lamellar tearing, which may occur during tensile restraint stress of welds. As a result of the tests, it was found that the SN 490C steel was sufficiently resistant to lamellar tearing.

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“…However, research has also shown the improvement in toughness is due to the formation of massive M-A constituents [15]. In addition to the morphology, the size of M-A constituents will also affect weld metal toughness [16][17][18]. Li et al [19] reported that the inter-critically reheated heat-affected zone (HAZ) toughness of X70 pipeline steel does not completely deteriorate because the M-A constituents of the steel are small and their content is low.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Changes and Impact Toughness of Fill Pass in X80 Steel Weld Metal

Bai

Ding

Tong

et al. 2019

Metals

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Multi-pass welding is used in high-pressure and thick-walled pipes in natural gas and oil pipelines. When a welding layer of a welded joint is subjected to different welding thermal cycles, its microstructure and properties change, thereby affecting the overall welding performance. In this study, the temperature and microstructural variations of the fill pass 2 (FP2) in the entire welding process were investigated by combining the thermal cycle with the cascade welding method. The original FP2 and FP2 after double thermal cycles had the worse deformation ability by tensile test. The toughness of FP2 improved after a single thermal cycle, decreased after double thermal cycles, and improved again after triple thermal cycles. The content of martensite–austenite (M–A) constituents and the average grain size of FP2 in the cascade samples were inversely proportional to FP2 toughness. Massive M–A constituents and their unique distribution at the inter-critical temperature were harmful to weld metal toughness. Controlling the size and fraction of M–A constituents can improve weld metal toughness.

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Influence of martensite-austenite (MA) on impact toughness of X80 line pipe steels

Cited by 108 publications

References 35 publications

Titanium microalloyed steels

Titanium microalloyed steels

Weldability and Lamellar Tearing Susceptibility of High-Strength SN 490C Steel Plates

Microstructural Changes and Impact Toughness of Fill Pass in X80 Steel Weld Metal

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