Variation of Mechanical Properties and Corrosion Properties with Mo Contents of Hyper Duplex Stainless-Steel Welds

Kim, Nohoon; Gil, Woong; Lim, Heuidae; Choi, C L; Lee, Hae-woo

doi:10.1007/s12540-018-0166-8

Cited by 19 publications

(7 citation statements)

References 32 publications

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“…The 347 stainless steel has been widely used for boiler tubes and pipelines in oil refineries and petrochemical plants because it has excellent high-temperature properties and economic efficiency [1][2][3]. When the 347 stainless steel is exposed to the service temperature of 400~650°c for a long time, fine and coarse carbides can be formed within grains or at the grain boundaries [4,5].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Ko,

Park,

Yoo

et al. 2021

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In-sItu ObservatIOn Of HIgH-temperature fracture beHavIOur Of 347 staInless steel subjected tO sImulated WeldIng prOcessIn-situ study on the high-temperature fracture behaviour of 347 stainless steel was carried out by using a confocal laser scanning microscope (clSm). The welding microstructures of the 347 stainless steel were simulated by subjecting the steel specimen to solution and aging treatments. undissolved nbc carbides were present within grains after solution treatment, and m 23 c 6 carbides were preferentially formed at grain boundaries after subsequent aging treatment. The m 23 c 6 carbides formed at grain boundaries worked as stress concentration sites and thus generated larger cracks during high-temperature tensile testing. In addition, grain boundary embrittlement was found to be a dominant mechanism for the high-temperature fracture of the 347 stainless steel because vacancy diffusion in the cr-depleted zones enhances intergranular fracture due to the precipitation of m 23 c 6 carbides at grain boundaries.

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Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Ko,

Park,

Yoo

et al. 2021

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“…Rajkumar et al [5] studied the influence of Nb addition and concluded the microstructure of sensitized steel revealed the niobium carbides, resulting in higher hardness and lower erosion rate. Kim et al [6] studied the influence of Mo, and conclude that the addition of Mo increase the ferrite volume fraction and decreased austenite volume fraction.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Addition to the Shielding Gas for Welding Hyper-duplex Stainless Steel

et al. 2020

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In the present work we have studied the effects of nitrogen addition on the equilibrium of the volume fraction ratio austenite/ferrite and on the structural properties of weldments produced by gas tungsten arc welding (GTAW). The welded joints in tubes UNS S32707 of hyper-duplex steel were produced using argon and nitrogen gas welding, with nitrogen added in ratios of 1.5, 2.5, 3.5, 4.5, and 5.5%. Microstructural characterization of this material under the different processing condition was conducted by means of optical microscopy, scanning electron microscopy, local chemical analysis by X-ray energy dispersive spectroscopy, electron backscatter diffraction Vickers microhardness test, and digital image processing. All welding conditions resulted in welded joints with equiaxial grains microstructure containing austenite both at the boundaries and in the ferrite matrix. Microhardness measurements did not show significant variation in relation to the base metal. The use of welding gases with higher percentages of nitrogen resulted in increases in the austenite volume fraction in the order of 39 to 57% when considering the nitrogen content ranging from 1.5 to 5.5%.

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“…The process and the quality of welding joints are significantly influenced by a number of factors, including properties and chemical composition of the welded material and electrodes [17], technological parameters [18,19] and welding conditions [20], as well as heat treatment after welding [21,22]. Among the various criteria for assessing the quality of welded joints, it is important to assess the tendency to crack [23] and the susceptibility to corrosion [24,25]. In the paper [17], the weldability, mechanical and plastic properties of S700MC steel, as well as the precipitation hardening characterized by a high yield, were obtained using the thermomechanical control process.…”

Section: Introductionmentioning

confidence: 99%

“…The main goal of [24] was the creation and evaluation a micro-arc oxidation coating in order to enhance the corrosion resistance of additively manufacture NiTi medical devices. Kim et al [25] studied the effect of the Mo content on the mechanical and corrosion properties of hyper duplex stainless-steel welds that are subjected to flux-cored arc welding.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Investigation of Temperature and Phase Transformation during SAW Overlaying

et al. 2019

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The article presents the modeling of temporary temperature and phase share calculations during SAW (submerged arc welding) overlaying of steel elements. The input heat of a melted electrode and the heat of direct electric arc impact have been taken into consideration in the temperature field solution. The characteristic areas (fusion, full and incomplete transformation), have been determined by solidus, A3 and A1 temperatures, respectively. The limit temperatures of the phase trandformations during cooling, based on the cooling rate in the temperature range 800–500 °C according to S355 steel time-temperature-transformation welding diagram, have been determined. The JMAK (Johnson–Mehl–Avrami–Kolmogorov) law and KM (Koistinen–Marburger) formula were used in the phase change kinetic description. Theoretical considerations were illustrated with examples of temperature and phase share computations for welding overlaid S355 steel plate. The analysis of the history of changes in temperature and structural components (phases) was carried out based on the results of numerical simulations as well as metallographic examination after SAW overlaying. The dimensions of the HAZ (heat-affected zone), obtained experimentally, and the structure types confirmed the results of the computation.

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Variation of Mechanical Properties and Corrosion Properties with Mo Contents of Hyper Duplex Stainless-Steel Welds

Cited by 19 publications

References 32 publications

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

Nitrogen Addition to the Shielding Gas for Welding Hyper-duplex Stainless Steel

Theoretical and Experimental Investigation of Temperature and Phase Transformation during SAW Overlaying

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