Effect of Alloying Elements and Microstructure on the Dynamic Strain Aging Behavior of 1.25Cr-0.5Mo and 2.25Cr-1Mo Steels

Lee, Yo Seob; Lee, Ho Jung; Lee, Sang-Kwon

doi:10.3365/kjmm.2021.59.11.769

Cited by 2 publications

(1 citation statement)

References 25 publications

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“…As industrial technologies advance, as well as the development of steam pumping pipeline networks and water supply pipeline systems to cool nuclear power plant reactors, it became necessary to combine pipes that not have the same chemical composition by a dissimilar welded joint to benefit from the common advantages of steels like 316LN ASS and Cr-Mo P11 steel. The joining method between these materials is heavily relies on welding processes to ensure permanent links between welded components, caused by thermal welding cycles that induce complete fusion and recrystallization of microstructures in one dissimilar weld joint [4][5][6][7].…”

Section: Introductionmentioning

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

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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: Introductionmentioning

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

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A Study on the Microstructures and Mechanical Properties of Ni-Cr-Mo-V Low Alloy Steels

Jo¹,

Ryu²,

Kim³

et al. 2022

Korean J. Met. Mater.

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Ni-Cr-Mo-V steel alloys for high-speed railway brake discs were prepared to investigate the effect of alloying element contents on the microstructure and mechanical properties. The Cr, Mo, Mn alloying elements were incorporated into the steel alloys, which contained low carbon content in the range 0.16 wt.% ~ 0.21 wt.% to provide sufficient hardenability. The steel alloys were austenitized at 940oC for 1 hour and quenched, and tempered at 610oC. Microstructural study showed a tempered martensitic microstructure with different sized austenite grains and packets. C-Mo alloy with high Mo content and the smallest prior austenite grain size showed the highest hardness and tensile strength. But, the alloy exhibited lower impact toughness than low Mo content alloys. The lowest tensile strength of the low Mo content Mn-Cr alloy, at room temperature and elevated temperature of 600oC, was 1053.4 MPa and 667.2 MPa, respectively. The grain refinement in the C-Mo alloy was considered to be due to the solute drag effect of the Mo element. The absorbed impact energy increased with tempering temperatures, but the impact energy of the three alloys had lower values than the generally guaranteed impact energy of the currently used disk. The low impact toughness of the Mo containing alloys was attributed to the higher Si content and higher tempered hardness of the alloys. A higher thermal conductivity and lower thermal expansion coefficient were obtained in the high Mo content C-Mo alloy, which had a higher Ac3 transformation temperature.

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Effect of Alloying Elements and Microstructure on the Dynamic Strain Aging Behavior of 1.25Cr-0.5Mo and 2.25Cr-1Mo Steels

Cited by 2 publications

References 25 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

A Study on the Microstructures and Mechanical Properties of Ni-Cr-Mo-V Low Alloy Steels

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