Microstructure evolution and its effect on the stress rupture behavior of 9%Cr-CrMoV dissimilar welded joint

Ding, Kai; Fan, Manjie; He, Yi; Huo, Xin; Liu, Xia; Wei, Tao; Wu, Guanzhi; Gao, Yulai

doi:10.1016/j.engfailanal.2023.107071

Cited by 8 publications

(3 citation statements)

References 51 publications

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“…This indicates a reduction in phases rich in carbon and metallic precipitates when comparing OP weld to SOP weld. This finding aligns with references that discuss the diffusion of alloying elements between dissimilar welding interfaces of a low carbone steel and austenitic stainless seel [30,31]. The consequence of this phenomenon is a diminished hardness and an augmented metallurgical and mechanical homogeneity in OP parameters in contrast to SOP parameters.…”

Section: Evolution Of Op and Sop Parameters 321 Effect Of Parameters ...supporting

confidence: 90%

“…This can be explained by a higher rate of intermetallic precipitates formed with SOP parameters compared to those of OP parameters (refer to figure 9(a)), such as σ phase precipitates (refer to figure 9(c)), resulting in decreased mechanical properties. Additionally, in the fusion zones (FZ's) of SOP parameters (figure 10(c)), the slight reduction in Fe rate from an average of 71% Fe in OP weld to 65% in SOP weld indicates a higher percentage of the δ intermetallic phase compared to OP parameters (figure 10(a)) [7,31]. This causes a decrease in the mechanical behavior within the FZ zone of SOP weld and thus underscores the positive effect of OP parameters on the FZ side.…”

Section: Evolution Of Op and Sop Parameters 321 Effect Of Parameters ...mentioning

confidence: 99%

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Multi-objective optimization and evolution of dissimilar welding process between Cr-Mo steel and austenitic stainless steel for power plant application

Benlamnouar,

Bensaid,

Saadi

et al. 2024

Mater. Res. Express

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In this study, response surface methodology (RSM) was employed to optimize the welding parameters' effects on mechanical properties of dissimilar welds between Cr-Mo steel grade (P11) and austenitic stainless steel (AISI 316LN). To determine the best welding parameters, variance analysis (ANOVA), desirability function, and perturbation analysis were used to create regression models and identify the significant parameters influencing tensile strength and hardness gaps in the weld joints. The results indicated that welding speed is the most significant parameter affecting both the austenitic hardness gap and tensile strength, while gas flow has the most significant impact on the hardness gap of Cr-Mo steel. Furthermore, welding speed positively influences the mechanical properties of dissimilar weld, whereas welding current has a slight negative effect on tensile strength. The optimum welding parameters were found to be 130 A for welding current, 70 mm/min for welding speed, and 13 l/min for welding gas flow, resulting in hardness gap values of 18.10 HV (Stainless steel side), 27.38 HV (Cr-Mo steel side), and a tensile strength of 453.90 MPa. The optimum parameter effect is concentrated at the weld interfaces between the fusion zone and the heat-affected zone. This effect led to limitations in grain coarsening, a reduction in the martensite and delta ferrite phase percentages, a slight increase in the bainite ratio, and a decrease in carbide precipitations. As a result, a homogenization of strain distribution in the optimum weld was achieved, leading to ductile fracture in Cr-Mo steel.

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Section: Evolution Of Op and Sop Parameters 321 Effect Of Parameters ...supporting

confidence: 90%

Section: Evolution Of Op and Sop Parameters 321 Effect Of Parameters ...mentioning

confidence: 99%

Multi-objective optimization and evolution of dissimilar welding process between Cr-Mo steel and austenitic stainless steel for power plant application

Benlamnouar,

Bensaid,

Saadi

et al. 2024

Mater. Res. Express

View full text Add to dashboard Cite

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“…Numerous industries, including oil and gas, power generation, chemical processing, and automobile manufacture, use CrMoV low alloy steel extensively. It is frequently used in manufacturing parts like pressure vessels, boiler tubes, turbine blades, crankshafts, and gears because they must have a high level of toughness, abrasion resistance, and temperature resistance [1].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of corrosion resistance of CrMoV low alloy steels using cryogenic treatment

Sarveswara Reddy,

Durga Rajesh,

Francis Luther King

2023

Eng. Res. Express

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The current investigation explores the effect of cryogenic treatment on the microstructural and corrosion behavior of CrMoV low-alloy steels. The casted samples in the required dimensions were treated by annealing followed by deep cryogenic treatment (DCT). Initially, the microstructural modification brought by combined treatments was studied using an optical microscope (OM), scanning electron microscope (SEM), and x-ray diffraction (XRD) technique. After DCT, a refined and uniform grain structure was identified. The DCT resulted in the development of a fine-grained structure and reduced the mean grain size of the alloy, and this refinement of the grain structure is due to the reduction of lattice defects during the cooling process. The corrosion behavior was studied using the weight loss and Tafel polarization tests. The corrosion findings indicated a significant enhancement in the corrosion resistance of the specimens after DCT. The DCT specimens exhibited higher corrosion potentials compared to the base material. The DCT can promote the development of a more protective passive layer on the sample’s surface. This passive layer serves as an obstacle, preventing the diffusion of corrosive products and increasing corrosion resistance. Finally, it suggests that DCT positively impacts the CrMoV steels’ resistance to corrosion.

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Comparative Analysis of Shot-Peened CrMoV Steels: Microstructural, Residual Stress, Surface Roughness, and Hardness Investigations

Sarveswara Reddy,

Durga Rajesh,

Maiti

2024

J. Inst. Eng. India Ser. D

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Microstructure evolution and its effect on the stress rupture behavior of 9%Cr-CrMoV dissimilar welded joint

Cited by 8 publications

References 51 publications

Multi-objective optimization and evolution of dissimilar welding process between Cr-Mo steel and austenitic stainless steel for power plant application

Multi-objective optimization and evolution of dissimilar welding process between Cr-Mo steel and austenitic stainless steel for power plant application

Enhancement of corrosion resistance of CrMoV low alloy steels using cryogenic treatment

Comparative Analysis of Shot-Peened CrMoV Steels: Microstructural, Residual Stress, Surface Roughness, and Hardness Investigations

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