Investigation of the microstructure of dissimilar welds in duplex stainless steel and low alloyed steel

Mitelea, Ion; Uţu, Ion Dragoş; Karancsi, Olimpiu; Urlan, Sorin Dumitru; Crăciunescu, Corneliu Marius

doi:10.3139/120.111292

Cited by 7 publications

(2 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They found that the highest hardness value is measured in the narrow zone close to the fusion zone, where there were hard micro-constituents, and which were formed by the migration of carbon from the HSLA side to this narrow zone. Mitelea et al [15] studied the chemical and microstructural heterogeneities of arc welded joints of duplex stainless steel (X2CrNiMoN22-5-3) and low alloy steel (13CrMo4-5).…”

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on the welded joint of X70 steel joined to duplex stainless steel by gas tungsten arc welding

Beziou

Hamdi

Boumerzoug

et al. 2023

Int J Adv Manuf Technol

View full text Add to dashboard Cite

The objective of this work is to study the microstructure and the texture evolution in welded joint of X70 steel with duplex stainless steel joined by gas tungsten arc welding (GTAW) process and heat treated at 200 °C and 600 °C. Then, the microstructural evolutions are correlated to their hardness mechanical property. The characterization techniques used are optical microscopy, scanning electron microscopy, EDS, Vickers microhardness, tensile tests, X-ray diffraction, and electron backscatter diffraction (EBSD) technique. Two heat affected zones were observed in welded joint with different microstructures. Heat affected zone on the X70 steel side and another on the duplex stainless steel side. A solidification microstructure was observed in the fusion zone such elongated ferritic grains and a growth direction < 100 > was found. The most microstructural transformations were observed in the vicinity of the interface which connects the heat affected zone to the fusion zone either on the X70 steel side or on the duplex stainless steel side. The effect of heat treatment on the hardness of the welded joint was noticed in the side of the duplex stainless steel. The fusion zone is the hardest zone of the welded joint (309.4 Hv) and which is not affected by the applied heat. X-ray diffraction analysis did not reveal the formation of new phases after the heat treatments applied to the welded joint. The tensile tests have shown that the welded joint treated at 200 C presents the highest value of ultimate tensile strength (667 MPa).

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on the welded joint of X70 steel joined to duplex stainless steel by gas tungsten arc welding

Beziou

Hamdi

Boumerzoug

et al. 2023

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

“…The chromium-molybdenum steel 13CrMo4-5 [6] is commonly used in the energy industry [7] for the construction of critical infrastructure elements, e.g., as a material for steam pipelines [8], due to its favorable mechanical properties [9]. Therefore, the creep resistance or corrosion resistance of this type of steel is extensively tested, taking into account various operating conditions, such as temperature, pressure, or environment [9].…”

Section: Introductionmentioning

confidence: 99%

The Diagnostics of Power Boilers in Terms of Their Sustainability

Gwoździk,

Depciuch

2023

Sustainability

View full text Add to dashboard Cite

Diagnosing steam pipelines is crucial because they are subjected to a water vapor environment and exhaust gases. Layers of oxides/deposits formed on steel utilized at elevated temperatures for long time periods have a significant impact on elements operating in power plants as well as in combined heat and power plants. Currently, these devices are an important topic of sustainable energy development. The aim of this work was to characterize the structure of the steel and of the oxides/deposit layer formed on the steam superheaters of power boilers and its impact on the durability of power equipment. The tests were carried out on 13CrMo4-5 steel utilized at various temperature and time parameters. In order to assess the degradation of the material, the following research methods were used: light microscopy, X-ray structural analysis, and infrared spectroscopy with Fourier transform. The use of the FTIR method in this type of diagnostics has deepened the existing analysis of oxide/sediment layers. The obtained test results showed that the kinetics of the corrosion process on steel being used for long periods at elevated temperatures is complex and depends, among others, on the element’s operating temperature, the operating time, and the flow medium.

show abstract

Effect of post-weld heat treatment on microstructure and corrosion properties of multi-layer super duplex stainless steel welds

Tian¹,

Gao²,

Han³

2021

Materials Testing

View full text Add to dashboard Cite

To investigate the influence of post-weld heat treatment on the microstructure and corrosion properties of super duplex stainless steel welded joints, multi-layer multi-pass welding of 2507 super duplex stainless steel by tungsten argon arc welding was performed using an ER2594 welding wire. The microstructures of the welded joints before and after post-weld heat treatment at 1150 °C, 1170 °C and 1190 °C were observed, and the mechanical and corrosion properties were tested. The post-weld heat treatment changed the austenite content and morphology of the welded joint and improved the corrosion resistance of different parts of the weld metal. The choice of various solution heat treatment temperatures affected the change in austenite content in the weld zone and the degree of diffusion and homogenization of the alloy elements. After post-weld heat treatment at 1170 °C, the two-phase ratios in each area of the weld were the most suitable and uniform, and the overall mechanical and corrosion properties of the joint were more uniform.

show abstract

Investigation of the microstructure of dissimilar welds in duplex stainless steel and low alloyed steel

Cited by 7 publications

References 11 publications

Effect of heat treatment on the welded joint of X70 steel joined to duplex stainless steel by gas tungsten arc welding

Effect of heat treatment on the welded joint of X70 steel joined to duplex stainless steel by gas tungsten arc welding

The Diagnostics of Power Boilers in Terms of Their Sustainability

Effect of post-weld heat treatment on microstructure and corrosion properties of multi-layer super duplex stainless steel welds

Contact Info

Product

Resources

About