Hardfacing of austenitic stainless steel with nickel-base NiCr alloy

Bhaduri, A.K.; Albert, Shaju K.; Das, C. R.; Raj, Baldev

doi:10.1504/ijmmp.2011.040436

Cited by 8 publications

(16 citation statements)

References 3 publications

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“…In addition to this challenge, researchers have claimed the need to replace cobalt based Stellite 6 hardfacing materials with the P91 substrate materials [3]. Cobalt based materials are often observed as causing radiation activity, BCC microstructure in HAZ and the formation of σ phase in given application [2,4,6]. Hence, nickel based hardfacing materials such as A 5.21 ERNiCr-B, A 5.21 ERNiCr-C, NiCrBSi, etc.…”

Section: Introductionmentioning

confidence: 99%

Development of NiCrSiBC Weld Hardfacing Approach for P91 Steels Used in Steam Turbine Components

Naik

Калыанкар

2021

Soldag. insp.

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P91 steels are used as substrate material for steam turbine components like bush, valve seat internals, and engineering valves. These components have hardfacing of cobalt-based material to reduce the high temperature wear loss and to improve the surface hardness. However, delamination failure and higher heat affected zone (HAZ) hardness were identified challenges for P91 steels. Hence, this demands the development of a suitable weld hardfacing approach to resolve the said challenges. In this work, NiCrSiBC (Colmonoy 6) has been considered as a hardfacing material to replace cobalt-based Stellite 6 material due to elimination of radiation activity, lower cost, and higher coating hardness. FCAW and PTA techniques were used to deposit buffer layer (SS-309L) and hardfacing layer (NiCrSiBC) respectively. Sample WBL (with deposition of buffer layer) and sample WOBL (without deposition of buffer layer) are considered approaches to study the metallurgical characterization for each case. Higher coating hardness, lower HAZ hardness and lower Fe dilution were observed in sample WBL. Cr7C3, Cr2B, and Cr5B3 hard phases in block shape together with ϒ- nickel matrix solid solution was observed in coating region of sample WBL. Overall, sample WBL approach was considered to overcome weld hardfacing challenges for steam turbine industries.

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Section: Introductionmentioning

confidence: 99%

Development of NiCrSiBC Weld Hardfacing Approach for P91 Steels Used in Steam Turbine Components

Naik

Калыанкар

2021

Soldag. insp.

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“…The 500 MWe Indian Prototype Fast Breeder Reactor (PFBR) is a liquid-sodium cooled nuclear reactor, where components are exposed to a minimum operating temperature of 673 K. 1 316LN austenitic stainless steel has been extensively used as a structural material for the components of the reactor as it possesses a better sensitization resistance. 2,3 Moreover, in PFBR, oxidation takes place on the surface of the components at elevated temperature and these oxide layer acts as a lubricant film during the relative motion of the components.…”

Section: Introductionmentioning

confidence: 99%

“…The radiation dose rate also increased to the maintenance workers at the time of the maintenance, decommissioning and handling of the hardfaced components. 1,3,6 Therefore, to resolve this problem, nickel-based alloys have been considered for hardfacing. On the basis of induced radioactivity of the materials and optimum thickness of the hardface coating, several nickel-based materials have been chosen and coated using different hardfacing techniques.…”

Section: Introductionmentioning

confidence: 99%

Wear performance of Ni-Cr-B-Si hardface coatings fabricated by cold metal transfer welding

Mishra

Kumar

Harmain

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Nickel-based thick hardface coatings are employed in nuclear power plants because of their superior wear and high-temperature resistance properties. Unfortunately, fabrication of a crack-free coating with less dilution is difficult using the conventional hardfacing techniques like Plasma Transferred Arc (PTA), Metal Inert Gas (MIG) etc. A sound coating having optimum hardness and better wear resistance property is essential for reactor applications. The current work aims to investigate the wear behaviour of Ni-Cr-B-Si hardface coating deposited on 316LN stainless steel, where metal-cored filler wire was used as a consumable in the Cold Metal Transfer (CMT) welding process. The hardface coating was characterized for its hardness and microstructure. Apart from that, pin-on-disc wear tests were performed using the extracted pin specimens from the hardfaced substrate. From this experiment, a micro-hardness of 531.24 ± 73.15 HV0.5 was measured across the coating cross-section. The microstructure analysis revealed the presence of precipitates like borides and carbides in the coating. Further, a specific wear rate of the order of 10−14 m3/Nm was found from the wear tests. Confocal microscopy on the worn surfaces of the pin specimens revealed, the surface damages mostly occurred by ploughing and fracture. The investigation ensures that CMT can be used for depositing crack-free, low dilution and wear-resistant hardface coatings in nuclear industries.

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“…Furthermore, slurry abrasive wear caused by contact has been a matter of significant consideration amongst researchers due to the intensity of the damages RESEARCH and the long-distance pipe lines used for coal transportation in power generation industry. Out of 9-12% Cr steels, 9Cr-1Mo steels are extensively chosen material to manufacture pipe components, valves, discs in power plant industries [3][4][5]. Amongst these components, engineering valves and coal carrying pipes are greatly exposed to abrasive wear during service conditions because of sliding contacts between two metals.…”

Section: Introductionmentioning

confidence: 99%

“…Laser cladding, plasma transferred arc (PTA), flux cored arc welding (FCAW), thermal spray techniques, and gas metal arc welding (GMAW) have been commonly used weld overlapping technique for hardfacing [3][4][5]. For engineering valves and coal carrying pipes, Co based and Ni based hardfacing materials are commonly observed as weld overlay material which are deposited by PTA technique on 9Cr-1Mo steels [2][3][4][5]. Delamination and cracks are witnessed during service conditions for direct deposition of hardfacing materials on 9Cr-1Mo steel [2].…”

Section: Introductionmentioning

confidence: 99%

Influence of Welding Position on Tribological Behavior of SS-309L Cladded Surface on 9Cr-1Mo Steel

Калыанкар¹,

Naik²

2021

Tribol. Ind.

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Welding position is a significant parameter for weld hardfacing operations applicable to engineering valves, coal transmission pipes in thermal power plants, mining industries, etc. Weld deposition is conducted with horizontal (1G) and vertical (3G) positions due to appropriate orientation of various engineering products. However, parameters like current, speed, travel angle, etc. are different for both welding positions. Therefore, it is required to investigate the influence of these two welding positions on tribological characteristics. In the present work, 1G and 3G weld positions are considered for SS-309L weld hardfacing on 9Cr-1Mo substrate material using flux cored arc welding (FCAW) process. Weld deposited surfaces are subjected to essential mechanical and metallurgical characterizations. Results confirm that the surface deposited using 1G position has higher slurry abrasive wear resistance (0.036 gms), lower dilution (14 %), and lower heat affected zone (HAZ) width (1.5 mm) which is significantly better than 3G position. SEM analysis shows fine elongated grains which precipitate from Cr element as nucleation site for the growth resulting in an improved eutectic matrix within fine grain structure. Wear resistance is improved in 1G position due to uniform elemental distribution of Fe and Cr observed with EDS analysis. Hence, 1G position is the best suitable position for weld hardfacing operations.

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Hardfacing of austenitic stainless steel with nickel-base NiCr alloy

Cited by 8 publications

References 3 publications

Development of NiCrSiBC Weld Hardfacing Approach for P91 Steels Used in Steam Turbine Components

Development of NiCrSiBC Weld Hardfacing Approach for P91 Steels Used in Steam Turbine Components

Wear performance of Ni-Cr-B-Si hardface coatings fabricated by cold metal transfer welding

Influence of Welding Position on Tribological Behavior of SS-309L Cladded Surface on 9Cr-1Mo Steel

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