Evaluation of microstructure and mechanical properties of P91 steel weldment due to addition of boron trioxide into flux during submerged arc welding

Roy, Joydeep; Naresh, Ram; Saha, Sushanta

doi:10.1007/s40194-017-0515-0

Cited by 8 publications

(4 citation statements)

References 15 publications

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“…The lowest grains were originated in case of maximum TiO 2 addition. Authors have also studied the effect of boron on the P91 steel weldment, where they have seen that 5% enrichment of B 2 O 3 provides the lowest grains [18]. Precipitation distribution in all weld metals was observed on etched specimens by scanning electron microscopy as shown in Fig.…”

Section: Microstructure Of Weld Metal Enriched By Timentioning

confidence: 99%

Studies on microstructure and mechanical properties of modified 9Cr–1Mo (P91) steel in submerged arc welding with TiO2-enriched fluxes

Roy

Chakraborti

Naresh

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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In the present work is studied the influence of titanium dioxide on the microstructure and mechanical properties of submerged arc weld P91 steel weldment. To manipulate the chemical composition of the weldment, the titanium dioxide (TiO 2 ) powder was added with fresh welding flux in various proportions (2.5-12.5%). The results of optical emission spectroscopy test showed that Ti wt% is systematically increased from 0.00 to 0.021, whereas, other alloying elements were fairly uniform. The micrographs of the scanning electron microscope reveal the presence of finely dispersed precipitates in the weld metals, and the percentage of precipitation increases with respect to the enrichment of titanium dioxide. The hardness profile of weld metal increases significantly with respect to the TiO 2 addition. Formation of TiC and TiN could be the possible reason for the enhancement of hardness, which has a positive impact on the creep property of steel weldment. Enrichment of TiO 2 reveals the appreciable improvement in the tensile strength properties. However, the highest percentage of TiO 2 addition provides the adverse effect on the yield strength and ultimate tensile strength values. The presence of surplus quantity of oxide content into the weld metal could be the possible reason behind this. Toughness value of the weld samples showed the negative trend with the addition of TiO 2 which can be increased by increasing the post-weld heating time.

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Section: Microstructure Of Weld Metal Enriched By Timentioning

confidence: 99%

Studies on microstructure and mechanical properties of modified 9Cr–1Mo (P91) steel in submerged arc welding with TiO2-enriched fluxes

Roy

Chakraborti

Naresh

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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“…In the consequence of grain growth and subsequent grain refinement in HAZ, the average size of previous austenite grains for CGHAZ, FGHAZ, and ICHAZ are found in descending order which are measured by adopting linear intercept methodology conforming to ASTM E112 [9]and presented in Table 4 [9].…”

Section: Microstructural Analysismentioning

confidence: 99%

“…The shape of the weld, as well as heat input related to this welding process, depends on the different process variables which can be controlled to get the desired joint [5]. During the submerged arc welding process, the weld area is heated up very sharply under the influence of welding heat input which cools down subsequently and generates residual stresses in the weldment [6]. The elements in the flux influence the quality of the WZ and Tanaka et al have shown in a study that the amount of sulphur and phosphorous in the weld are decreased with the increase in basic oxides in flux [7].…”

Section: Introductionmentioning

confidence: 99%

“…Chromium and Molybdenum, being two major constituents, of this steel act as carbide former and ferrite stabilizer respectively. The small additions of V, Nb, N and other alloying elements in P-91 steel have considerably upgraded the service quality of this type of structural steel in the temperature region of 600°C comparing to earlier grades P-22 (2.25Cr -1Mo) steel [9]. The low temperature (375°C-185°C) martensitic transformation in the weld zone of P-91 steel is an important phenomenon [10].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Microstructural Changes on Residual Stress Characteristics and Macro-Hardness of Submerged Arc Welded P-91 Steel Plates

et al. 2021

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In this study, the submerged arc welded butt joint of P-91 ferritic-martensitic alloy steel plates has been chosen to examine the influence of microstructural changes on welding residual stress characteristics and macrohardness in the weldment with two different heat input 2497.5 J/mm & 2040J/mm respectively. The stress magnitudes at a different location on the welded specimen are measured by X-ray diffraction technique at the postweld heat-treated condition. Compressive stresses are observed in the weld zone (WZ) and tensile stresses are detected at the boundary of the heat-affected zone (HAZ) near the weld zone. Higher compressive stresses are found in the weld zone of both the specimens where maximum hardness values are observed. Different grain matrix in the microstructure contributes significantly towards the quality of weldment. Residual stress, as well as the hardness of weldment, is found to be influenced by the martensite phase transformation and dissolution of precipitates. A modeling concept is presented for dimensional analysis of martensite structure. Energy dispersive X-ray indicates the distribution of carbides at the grain boundaries. Optical micrograph substantiates the presence of δ-ferrite in the WZ.

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Numerical Study of Welding Distortion in SAW Welded Creep Strength Enhanced Ferrite Steel Joint

Suman

Biswas

2020

Advances in Mechanical Engineering

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Evaluation of microstructure and mechanical properties of P91 steel weldment due to addition of boron trioxide into flux during submerged arc welding

Cited by 8 publications

References 15 publications

Studies on microstructure and mechanical properties of modified 9Cr–1Mo (P91) steel in submerged arc welding with TiO2-enriched fluxes

Studies on microstructure and mechanical properties of modified 9Cr–1Mo (P91) steel in submerged arc welding with TiO2-enriched fluxes

Influence of Microstructural Changes on Residual Stress Characteristics and Macro-Hardness of Submerged Arc Welded P-91 Steel Plates

Numerical Study of Welding Distortion in SAW Welded Creep Strength Enhanced Ferrite Steel Joint

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