A comparative study of creep rupture behaviour of modified 316L(N) base metal and weldment in air and liquid sodium environments

Mishra, Maneesha; Borgstedt, H.U.; Mathew, M.D.; Mannan, S.L.; Rodríguez, P.

doi:10.1016/s0308-0161(97)00016-1

Cited by 14 publications

(5 citation statements)

References 8 publications

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“…This would complement the already on-going extensive programmes on mechanical properties, particularly creep and fatigue, of PFBR materials and would help in materials choice, fabrication routes and accurate lifetime predictions for the components operating in liquid sodium. In the meanwhile, studies have been carried out in close collaboration with Forschungzentrum, Karlsruhe, Germany on the creep, fatigue, creep-fatigue interaction and crack growth behaviour of austenitic SS (Mishra et al 1996(Mishra et al , 1997. In general, fatigue lives of specimens tested in sodium were higher by a factor of four compared to air environment.…”

Section: Influence Of Sodiummentioning

confidence: 99%

Development of fuels and structural materials for fast breeder reactors

Raj

Mannan

Rao

et al. 2002

Sadhana

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Fast breeder reactors (FBRs) are destined to play a crucial role in the Indian nuclear power programme in the foreseeable future. FBR technology involves a multidisciplinary approach to solve the various challenges in the areas of fuel and materials development. Fuels for FBRs have significantly higher concentration of fissile material than in thermal reactors, with a matching increase in burn-up. The design of the fuel is an important aspect which has to be optimised for efficient, economic and safe production of power. FBR components operate under hostile and demanding environment of high neutron flux, liquid sodium coolant and elevated temperatures. Resistance to void swelling, irradiation creep, and irradiation embrittlement are therefore major considerations in the choice of materials for the core components. Structural and steam generator materials should have good resistance to creep, low cycle fatigue, creep-fatigue interaction and sodium corrosion. The development of carbide fuel and structural materials for the Fast Breeder Test Reactor at Kalpakkam was a great technological challenge. At the Indira Gandhi Centre for Atomic Research (IGCAR), advanced research facilities have been established, and extensive studies have been carried out in the areas of fuel and materials development. This has laid the foundation for the design and development of a 500 MWe Prototype Fast Breeder Reactor. Highlights of some of these studies are discussed in this paper in the context of our mission to develop and deploy FBR technology for the energy security of India in the 21 st century.

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Section: Influence Of Sodiummentioning

confidence: 99%

Development of fuels and structural materials for fast breeder reactors

Raj

Mannan

Rao

et al. 2002

Sadhana

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“…Fusion welding is frequently employed to create the reactor vessel and pipes due to their intricacy and scale. Cracking in weld joints is the most serious concern for welded components [24]. The tungsten inert gas (TIG) welding operation, both with and without filler metal, is the most often used method for combining this class of materials.…”

Section: Introductionmentioning

confidence: 99%

Parametric optimization for hardness of tig welded duplex stainless steel

Mondal,

Kumar Bose

2023

Int. J. Ind. Optim.

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Achieving optimal mechanical properties in welding joints hinges on employing precise parametric conditions. This is particularly crucial for Tungsten Inert Gas (TIG) welding of ASTM/UNS 2205 Duplex Stainless Steel (DSS), where attributes like hardness, ultimate tensile strength, and yield strength are paramount. Maintaining high Hardness Value (HV) demands proper welding parameters such as welding current, gas flow rate, and welding speed. To enhance DSS welding quality, especially hardness, this study utilizes the Taguchi method to optimize welding process parameters. The importance of each factor is assessed through Annova statistical analysis. The outcomes highlight the positive impact of parametric optimization on HV, as evidenced by the analysed data. Parametric optimization proves to be a potent approach for refining industrial processes like welding, with particular relevance in TIG welding of duplex stainless steel due to its mechanical robustness and corrosion resistance. Nevertheless, challenges arise due to the material's elevated hardness and low thermal conductivity, resulting in potential defects like cracks and porosity. The identification of optimal welding parameters, encompassing current, voltage, speed, and gas flow rate, helps address these challenges and advances high-quality welds. Through systematic variations and analysis of these parameters, researchers and engineers can pinpoint the optimal combination that mitigates defects while maximizing desired joint attributes. Within the realm of TIG welding of duplex stainless steel, metric optimization holds the potential to elevate welding quality, curtail costs and waste, and heighten productivity and safety. Consequently, organizations can attain enhanced performance, efficiency, and profitability within their welding processes

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“…In the present investigation constant load creep tests have been carried out on laser welded 316L(N) stainless steel joints and 316L(N)SS base material. The 316L(N) base material is used as a high temperature structural material for FBTR applications (Reddy et al, 1980;Girish Shastry et al, 2004;Baldev Raj et al, 2010;Ganesan et al, 2010;Sakthivel et al, 2011;Mishra et al, 1997;Mathew et al, 2012;Tjong et al, 1995). The selection of this material is based on the considerations of its compatibility with liquid sodium coolant, superior creep strength at the FBTR operating temperatures, weldability availability of design data, resistance to oxidation and resistance to corrosion and free from sensitization (Girish Shastry et al, 2004;Sakthivel et al, 2011;Tjong et al, 1995;Sakthivel et al, 201).…”

Section: Introductionmentioning

confidence: 99%

“…(Baldev Raj et al, 2010). The strength properties of this steel usually vary in the range 580-800 MPa which depends on the nitrogen content (Ganesan et al, 2010;Sakthivel et al, 2011;Mishra et al, 1997;Mathew et al, 2012). To study the creep-rupture behavior of the 316L(N)SS, three stresses have been selected which varied in the range 0.3-0.4 UTS.…”

Section: Introductionmentioning

confidence: 99%

Creep Failures in Laser Welded 316L(N) Stainless Steel Joints

Kumar¹,

Shaktivelu²,

Gopal³

et al. 2012

JMSR

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Low carbon, nitrogen alloyed 316L(N) SS is an high temperature structural material for Fast Breeder Test Reactor (FBTR) applications. Laser welding is a non contact, low heat input widely accepted welding process for welding a wide variety of materials due to its advantages like deep narrow welds, minimum distortion, narrow heat-affected zone, excellent metallurgical quality, ability to weld smaller size, thinner and thicker components and increased travel speeds compared to other welding processes. Creep rupture tests have been carried out on laser welded 316L(N) SS joints at 650ºC. The Rupture behavior of these joints has been investigated at stresses in the range 180–220MPa. In the present paper an attempt has been made to present the results on the creep failure mechanisms of creep–ruptured laser welded 316L(N)SS joints. It has been observed that creep fracture occurred in an inter granular fashion at all the stresses that have been tested and creep cavitation was the dominant mechanism in controlling the creep rupture behavior.

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A comparative study of creep rupture behaviour of modified 316L(N) base metal and weldment in air and liquid sodium environments

Cited by 14 publications

References 8 publications

Development of fuels and structural materials for fast breeder reactors

Development of fuels and structural materials for fast breeder reactors

Parametric optimization for hardness of tig welded duplex stainless steel

Creep Failures in Laser Welded 316L(N) Stainless Steel Joints

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