Role of evolving microstructure on the mechanical behaviour of P92 steel welded joint in as-welded and post weld heat treated state

Pandey, Chandan; Mahapatra, Manas Mohan; Kumar, Pradeep; Thakre, J. G.; Saini, Nitin

doi:10.1016/j.jmatprotec.2018.08.032

Cited by 91 publications

(33 citation statements)

References 28 publications

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“…2 ( Figure 11 , Table 5 ). The impact of the δ-ferrite on the reduction in hardness of weld fusion zone is also presented by Pandey [ 31 , 34 ]. Poor mechanical properties of δ-ferrite confirm the poor resistance to deformation and affects the tendency to failure during creep service [ 33 ].…”

Section: Resultsmentioning

confidence: 98%

“…In the HAZ, similar to base material, the M 23 C 6 precipitates are mainly observed at the boundaries/laths/blocks, while MX precipitates are observed inside the laths/subgrains [ 31 , 32 ]. The size of the prior austenite grain in martensitic steels is an important factor affecting the steel properties, such as: tensile strength, toughness, creep strength, as well as susceptibility to the damage mechanism, e.g., type IV cracking [ 31 , 33 , 34 , 35 ].…”

Section: Resultsmentioning

confidence: 99%

“…The Laves phase also decrease of toughness [ 39 ]. In this area, the accelerated recovery of tempered martensite lath structure as compared to the other areas of the joint is observed too [ 27 , 34 ]. A relatively high advancement of the microstructure degradation in these areas was related not only to the effect of the thermal cycle, but also to the treatment of joints following welding.…”

Section: Resultsmentioning

confidence: 99%

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Microstructure and Mechanical Properties of Modern 11%Cr Heat-Resistant Steel Weld Joints

et al. 2021

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In addition to good high-temperature creep resistance and adequate heat resistance, steels for the power industry must have, among other things, good weldability. Weldability of such steels is one of the criteria determining whether or not the material is suitable for applications in the power industry. Therefore, when materials such as martensitic steel Thor 115 (T115) are introduced into the modern power industry, the quality and properties of welded joints must be assessed. The paper presents the results of metallographic and mechanical investigations of T115 martensitic steel welded joints. The analysis was carried out on joints welded with two filler metals: WCrMo91 (No. 1) and EPRI P87 (No. 2). The scope of the investigations included: microstructural investigations carried out using optical, scanning and transmission electron microscopy and mechanical testing, i.e., Vickers microhardness and hardness measurement, static tensile test and impact test. The macro- and microstructural investigations revealed correct structure of the weld, without welding imperfections. The microstructural investigations of joint No. 1 revealed a typical structure of this type of joint, i.e., the martensitic structure with numerous precipitates, while in joint No. 2, the so-called Nernst’s layers and δ-ferrite patches were observed in the weld fusion zone as well as the heat affected zone (HAZ). The mechanical properties of the test joints met the requirements for the base material. A slight influence of the δ-ferrite patch on the strength properties of joint No. 2 was observed, and its negative effect on the impact energy of HAZ was visible.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Microstructure and Mechanical Properties of Modern 11%Cr Heat-Resistant Steel Weld Joints

et al. 2021

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“…Besides the regions of base material (BM) and weld metal (WM) within the structures of all welded joints, thermal effect of fusion welding on the welded ferritic steels' BMs typically results in the creation of a relatively wide heat-affected zone (HAZ) consisting of several, continuously created microstructural sub-regions, i.e., often called the "HAZ microstructural gradient". Its occurrence within the welded joint represents the primary, welding-induced microstructure degradation zone, since the individual HAZ sub-regions, such as the coarse-grained HAZ (CG-HAZ), fine-grained HAZ (FG-HAZ), inter-critical HAZ (IC-HAZ), and subcritical HAZ (SC-HAZ), possess mutually various microstructures and mechanical properties [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Electrolytic Hydrogenation on Mechanical Properties of T92 Steel Weldments under Different PWHT Conditions

et al. 2020

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In the present work, the effects of electrolytic hydrogen charging of T92 steel weldments on their room-temperature tensile properties were investigated. Two circumferential weldments between the T92 grade tubes were produced by gas tungsten arc welding using the matching Thermanit MTS 616 filler material. The produced weldments were individually subjected to considerably differing post-welding heat treatment (PWHT) procedures. The first-produced weldment was conventionally tempered (i.e., short-term annealed below the Ac1 critical transformation temperature of the T92 steel), whereas the second one was subjected to its full renormalization (i.e., appropriate reaustenitization well above the T92 steel Ac3 critical transformation temperature and subsequent air cooling), followed by its conventional subcritical tempering. From both weldments, cylindrical tensile specimens of cross-weld configuration were machined. The room-temperature tensile tests were performed for the individual welds’ PWHT states in both hydrogen-free and electrolytically hydrogen-charged conditions. The results indicated higher hydrogen embrittlement susceptibility for the renormalized-and-tempered weldments, compared to the conventionally tempered ones. The obtained findings were correlated with performed microstructural and fractographic observations.

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“…It would be crucial to know the methods of manufacturing the elements and their uses to begin the analysis of their weldability. The weldability of these materials depends on many parameters such as the geometry of the weld joint, and the mechanical and chemical properties of the different elements [1][2][3]. After that, the characteristics of the filler metal are used when welding with an electric arc or others.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation of the Heat Input Effect on the Mechanical Properties and Microstructure of Dissimilar Weld Joints of 690-MPa QT and TMCP Steel

Bayock

Kah

Layus

et al. 2019

Metals

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The study evaluates numerically and experimentally the effect of welding heat input parameters on the microstructure and hardness of the heat-affected zone (HAZ) of quenched and tempered (QT) and thermo-mechanically controlled process (TMCP) 690-MPa high-strength steel. Numerical analyses and experimental comparisons were applied using three heat input values (10, 14, and 17 kJ/cm) in order to predict the thermal fields during welding. Experimental analysis was carried out of the microstructure and microhardness behavior in different HAZ areas. The numerical values indicate that the maximum respective values of temperature measured in QT steel and TMCP steel were about 1300 and 1200 °C for a heat input of 10 kJ/cm, 1400 and 1300 °C for a heat input of 14 kJ/cm, and 1600 and 1450 °C for a heat input of 17 kJ/cm. The cooling times resulted, for a heat input of 10 kJ/cm, in numerical t8/5 (14.5 s) and experimental (18.84 s) increases in hardness in the coarse-grain heat-affected zone (CGHAZ) of the QT steel (317 HV0.1), due to the formation of bainite and lath martensite structures with grain growth. Decreased hardness in the CGHAZ of TMCP steel (240 HV0.1) was caused by primary recrystallization of the microstructure and the formation of more equilibrium products of austenite decomposition. Increasing the heat input (14 to 17 kJ/cm) led to numerical t8/5 (29 s) and experimental (36 s) decreases in hardness in the CGHAZ of QT steel (270 HV0.1) due to the full austenite (thermal weld cycle), and maintained the relative value of TMCP steel (235 HV0.1).

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Role of evolving microstructure on the mechanical behaviour of P92 steel welded joint in as-welded and post weld heat treated state

Cited by 91 publications

References 28 publications

Microstructure and Mechanical Properties of Modern 11%Cr Heat-Resistant Steel Weld Joints

Microstructure and Mechanical Properties of Modern 11%Cr Heat-Resistant Steel Weld Joints

The Effect of Electrolytic Hydrogenation on Mechanical Properties of T92 Steel Weldments under Different PWHT Conditions

Numerical and Experimental Investigation of the Heat Input Effect on the Mechanical Properties and Microstructure of Dissimilar Weld Joints of 690-MPa QT and TMCP Steel

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