Welding Consumable Development for a Cryogenic (4 K) Application

Kane, S.; Siewert, Thomas A.; McCowan, Christopher N.; Farland, A.

doi:10.1007/978-1-4757-9056-6_12

Cited by 10 publications

(6 citation statements)

References 5 publications

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“…[23,24] However, this 78 J is substantially lower than that of F316L (ca. 250 J), and is relatively close to the quoted recommended minimum standard.…”

Section: Discussionmentioning

confidence: 81%

Effect of Oxygen Content Upon the Microstructural and Mechanical Properties of Type 316L Austenitic Stainless Steel Manufactured by Hot Isostatic Pressing

Cooper

Dhers

et al. 2016

Metall Mater Trans A

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Although hot isostatic pressing (HIP) has been shown to demonstrate significant advances over more conventional manufacture routes, it is important to appreciate and quantify the detrimental effects of oxygen involvement during the HIP manufacture process on the microstructural and material properties of the resulting component. This paper quantifies the effects of oxygen content on the microstructure and Charpy impact properties of HIP'd austenitic stainless steel, through combination of detailed metallographic examination and mechanical testing on HIP'd Type 316L steel containing different concentrations (100 to 190 ppm) of oxygen. Micron-scale pores were visible in the microstructure of the HIP'd materials postmetallographic preparation, which result from the removal of nonmetallic oxide inclusions during metallographic preparation. The area fraction of the resulting pores is shown to correlate with the oxygen concentration which influences the Charpy impact toughness over the temperature range of 77 K to 573 K (À196°C to 300°C), and demonstrates the influence of oxygen involved during the HIP manufacture process on Charpy toughness. The same test procedures and microstructural analyses were performed on commercially available forged 316L. This showed comparatively fewer inclusions and exhibited higher Charpy impact toughness over the tested temperature range.

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“…[23,24] However, this 78 J is substantially lower than that of F316L (ca. 250 J), and is relatively close to the quoted recommended minimum standard.…”

Section: Discussionmentioning

confidence: 81%

Effect of Oxygen Content Upon the Microstructural and Mechanical Properties of Type 316L Austenitic Stainless Steel Manufactured by Hot Isostatic Pressing

Cooper

Dhers

et al. 2016

Metall Mater Trans A

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“…The geometry of the model was defined in accordance with BS 10045. [32] Eight-node full integration elements were used to represent the specimen geometry; layers of elements were defined through the specimen thickness and were biased in thickness toward the outer surface of the geometry. A refined mesh arrangement was used such that the aspect ratio of the elements surrounding the V-notch tip was unity, with a minimum element size of 24 lm 9 17 lm 9 1 mm.…”

Section: Materials Flow Propertiesmentioning

confidence: 99%

An Assessment of the Ductile Fracture Behavior of Hot Isostatically Pressed and Forged 304L Stainless Steel

Cooper

Smith

Sherry

2017

Metall Mater Trans A

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Type 300 austenitic stainless steel manufactured by hot isostatic pressing (HIP) has recently been shown to exhibit subtly different fracture behavior from that of equivalent graded forged steel, whereby the oxygen remaining in the component after HIP manifests itself in the austenite matrix as nonmetallic oxide inclusions. These inclusions facilitate fracture by acting as nucleation sites for the initiation, growth, and coalescence of microvoids in the plastically deforming austenite matrix. Here, we perform analyses based on the Rice-Tracey (RT) void growth model, supported by instrumented Charpy and J-integral fracture toughness testing at ambient temperature, to characterize the degree of void growth ahead of both a V-notch and crack in 304L stainless steel. We show that the hot isostatically pressed (HIP'd) 304L steel exhibits a lower critical void growth at the onset of fracture than that observed in forged 304L steel, which ultimately results in HIP'd steel exhibiting lower fracture toughness at initiation and impact toughness. Although the reduction in toughness of HIP'd steel is not detrimental to its use, due to the steel's sufficiently high toughness, the study does indicate that HIP'd and forged 304L steel behave as subtly different materials at a microstructural level with respect to their fracture behavior.

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“…It has been established that, 30% He improves fluidity and arc stability and allows a higher welding speed, 1-2% O 2 or 2-3% CO 2 increases the arc stability and 1-2% N 2 can improve mechanical and corrosion properties when welding nickel based and super duplex alloys [49]. Kane et al [56], reported that, welding of high nickel stainless steel alloy by pulsed GMAW was impossible using 100% argon due to arc instability also, it was reported that, the weldability improved when 1% CO 2 was added to the shielding gas mixture. Recommended shielding gas mixtures for various wire materials are given in Tables 3 and 4.…”

Section: Selection Of Shielding Gasmentioning

confidence: 99%