scholarly journals Results of an Interlaboratory Fatigue Test Program Conducted on Alloy 800H at Room and Elevated Temperatures

1987 ◽  
Vol 15 (5) ◽  
pp. 249 ◽  
Author(s):  
A Wolfenden ◽  
JR Ellis
Keyword(s):  
Fatigue Test ◽  
Elevated Temperatures ◽  
Test Program ◽  
Alloy 800H

F-111A Wing Fatigue Test Program

1976 ◽  
Author(s):  
Robert L. Schneider
Keyword(s):  
Fatigue Test ◽  
Test Program

Fatigue Performance of Grade R4 and R5 Mooring Chains in Seawater

2014 ◽  
Author(s):  
Jonathan Fernández ◽  
Walther Storesund ◽  
Jesús Navas
Keyword(s):  
Fatigue Test ◽  
Fatigue Damage ◽  
Fatigue Tests ◽  
Design Methods ◽  
Full Scale ◽  
Fatigue Performance ◽  
Test Program ◽  
Gas Industry ◽  
Fatigue Design ◽  
Cumulative Fatigue Damage

With more than 50.000 tons in service to date, the Oil&Gas Industry has the need to understand the tension fatigue performance of grade R5 chains in straight tension, and corroborate the validity of the existing design methods. The chain fatigue design curves in API and DNV are based on fatigue tests obtained in the nineties and early two thousands. However the tests were performed on lower grades such as ORQ, R3 and R4, and small chains, 76 mm diameter being the largest studless chain tested. The industry has moved towards the use of large studless chains, especially in permanent units, where chain diameters above 150 mm are not unusual. This paper gathers information from a full scale fatigue test program on grade R4 and R5 studless chains, performed in seawater and with diameters between 70 mm and 171 mm. The chains being tested are actual production chains supplied for different drilling units and large permanently moored production floating units. The paper analyses the data and determines tension-tension fatigue curves based on API and DNV methods for computation of cumulative fatigue damage, regardless of other damaging mechanisms. Improved fatigue capacity is obtained with respect to the above recommended design methods.

INCO-WELD A ELECTRODE

Alloy Digest ◽  
1984 ◽  
Vol 33 (11) ◽  
Keyword(s):  
Arc Welding ◽  
Elevated Temperatures ◽  
Base Alloy ◽  
Heat Treating ◽  
Shielded Metal Arc Welding ◽  
Alloy 800H ◽  
Inconel Alloys ◽  
Metal Arc Welding ◽  
High Nickel ◽  
Nickel Base

Abstract INCO-WELD A Electrode is a nickel-base alloy developed for shielded metal-arc welding of INCONEL alloys 600 and 601 and INCOLOY alloy 800H to be exposed to elevated temperatures (up to about 1600 F). This electrode also is used widely for various dissimilar combinations of austenitic and ferritic steels and high-nickel alloys in all positions. This datasheet provides information on composition and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and surface treatment. Filing Code: Ni-305. Producer or source: Huntington Alloys.

Alloy 800H: Material and Fabrication Challenges Associated With the Mitigation of Stress Relaxation Cracking

2020 ◽  
Author(s):  
Richard Colwell ◽  
Cathleen Shargay
Keyword(s):  
Heat Treatment ◽  
Stress Relaxation ◽  
Elevated Temperatures ◽  
Alloy Composition ◽  
Alloy 800H ◽  
Dissimilar Metal ◽  
High Temperature Alloys ◽  
Technical Report ◽  
Treatment Measures ◽  
Iron Nickel

Abstract Heat resistant Iron-Nickel-Chrome alloys, such as Alloy 800H, are designed to be used at elevated temperatures. At temperatures ranging from 550 to 750°C (1022 to 1380°F) these alloys can be susceptible to stress relaxation cracking (SRC). For these and other high temperature alloys, API Technical Report 942-B provides recommended ranges for material composition, as well as fabrication and heat treatment measures to mitigate Stress Relaxation Cracking. However, it has been shown to be difficult to obtain material that satisfies the API recommended prescriptions. Recommended alloy composition, welding and fabrication steps can become complex for special situations found on projects (i.e. thicker wall piping, dissimilar metal welds, etc.). This paper discusses example applications, and the reasons for selecting Alloy 800H. It also describes the SRC mechanism, the technical justifications for the API 942-B recommendations, and the challenges that have been experienced trying to meet these recommendations.

A full-scale structural fatigue test program

1965 ◽  
Vol 2 (5) ◽  
pp. 407-410 ◽  
Author(s):  
R. N. KETOLA
Keyword(s):  
Fatigue Test ◽  
Full Scale ◽  
Test Program ◽  
Structural Fatigue

Mechanical and Microstructural Characterization of Diffusion Bonded 800H

2020 ◽  
Author(s):  
Heramb P. Mahajan ◽  
Mohamed Elbakhshwan ◽  
Bruce C. Beihoff ◽  
Tasnim Hassan
Keyword(s):  
Mechanical Property ◽  
Base Metal ◽  
Microstructure Evolution ◽  
Diffusion Bonding ◽  
Elevated Temperatures ◽  
Bonding Process ◽  
Atomic Diffusion ◽  
Alloy 800H ◽  
Tensile Fatigue ◽  
Creep Fatigue

Abstract Compact heat exchangers have high compactness and efficiency, which is achieved by joining a stack of chemically etched channeled plates through diffusion bonding. In the diffusion bonding process, compressive stress is applied on plates at elevated temperatures for a specified period. These conditions lead to atomic diffusion, which results in the joining of all plates into a monolithic block. The diffusion bonding temperatures are above recrystallization temperatures, which changes the mechanical and microstructural properties of the bonded metal. Hence, diffusion bonded material needs mechanical and microstructural property evaluation. In this study, Alloy 800H is selected to study the influence of the diffusion bonding process on mechanical and microstructure properties of base metal. A series of tensile, fatigue, creep, and creep-fatigue experiments are conducted on base metal 800H (BM 800H) and diffusion bonded 800H (DB 800H) to explore the mechanical properties. Microstructure evolution during diffusion bonding is studied and presented in the paper. The mechanical and microstructural observations indicated ductile fracture at room temperature and brittle failure with bond delamination at elevated temperatures. The microstructure evolution during diffusion bonding is studied through tensile, fatigue, creep and creep-fatigue tests, and the implied root causes for the mechanical property changes are investigated. Efforts are made to correlate the microstructure change with mechanical property change in DB 800H.

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