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Tuesday, August 11, 2020 | History

2 edition of Crack growth under creep conditions in HK-40 stainless steel. found in the catalog.

Crack growth under creep conditions in HK-40 stainless steel.

Malcolm Donald Milne Bain

# Crack growth under creep conditions in HK-40 stainless steel.

## by Malcolm Donald Milne Bain

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Published by University of Aston in Birmingham. Department of Metallurgy and Materials in Birmingham .
Written in English

Edition Notes

Thesis (Ph.D.) - University of Aston in Birmingham 1980.

ID Numbers
Open LibraryOL13774398M

Economic considerations have made it desirable to extend the 30 to 40 year operating life of power plants by another 10 to 20 years. Crack growth at elevated temperatures is an important consideration in estimating the remaining life, determining operating conditions and deciding inspection criteria and intervals for power plant materials. This paper presents an overview of high-temperature. The material used in this work was from a well characterized heat of Type stainless steel, for which creep-crack growth data were previously obtained using conventional compact-tension type and center-cracked-tension type specimens. Good correlation was obtained between the crack growth rate and C j, where C j is the experimental.

Fatigue crack initiation and crystallographic crack growth in an austenitic stainless steel (C. Chauvot, M. Sester). Influence of material state at a crack tip on the process of fatigue striations formation for Al-based alloys (A.A. Shaniavski). Influence of mean stress on . Technical Report: Creep crack growth in boiler and steam pipe steels: Topical report Title: Creep crack growth in boiler and steam pipe steels: Topical report Full Record.

Crack growth under creep conditions in HK stainless steel Author: Bain, Malcolm D. M. ISNI: Awarding Body: University of Aston in Birmingham Current Institution: Aston University Date of Award: Availability of Full Text. Then, creep crack growth tests based on the reference stress method on P92 steel base metal and welding HAZ compact tensile samples were carried out at K and under stress intensity factor K of 18 MPam 1/2. From the calculated and experimental data, it was found that a good relationship existed between the creep crack growth rate da/dc and.

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### Crack growth under creep conditions in HK-40 stainless steel by Malcolm Donald Milne Bain Download PDF EPUB FB2

The creep crack growth laws derived in Sections and will now be compared with experimental crack propagation data that have been taken from a number of sources. The experimental results were collected using the procedures discussed in ASTM E ().The appropriate parameters used for describing the creep properties of the materials investigated are listed in Table 1.

Experimental correlation between the creep crack growth rate and the C* parameter for Cr-Mo-V steel (a high-temperature creep-ductile material) and IN alloy (a high-temperature creep-brittle material) is shown in Figures andrespectively [1, 2].For the case of Cr-Mo-V steel, a non-unique correlation between da/dt and C* in the lower creep crack growth region is clearly apparent.

Creep–fatigue crack growth tests were conducted on a modified 9Cr–1Mo (P91) steel at °C under constant load amplitude conditions with various hold times using compact type specimens. The crack growth rates per cycle increased significantly with increase in hold time when crack growth data were plotted with the cyclic stress intensity Cited by: Crack growth under creep conditions in Hk stainless steel.

By M Bain. Abstract. SIGLEAvailable from British Library Document Supply Centre- DSC:D/81 / BLDSC - British Library Document Supply CentreGBUnited KingdoAuthor: M Bain. A variable creep ductility model, incorporating stress dependent strain rate effects, has therefore been implemented in a finite element (FE) analysis to predict creep crack growth (CCG) in H stainless steel at $$\,^\circ \mathrm{{C}}$$.Cited by: 4.

Crack growth in compact specimens of type stainless steel is studied at oC. Loading conditions include pure fatigue loading, static loading and fatigue loading with hold time.

Crack growth rates are correlated with the stress intensity factor. A finite element analysis is performed to understand the crack tip field under creep-fatigue loading. Creep Crack Growth in an Austenitic Stainless Steel Welded Joint H. SASSOULAS and P. B A L L A D O N Unirec, Groupe Usinor-Sacilor, BP 50, Firminy Cedex, France The study of the behaviour of materials under fatigue and creep condition is made necessary by the development of structures submitted to high temperatures, such as may be encoutered in the nuclear, aeronautical, oil.

The model is calibrated and used to predict the crack density and crack-growth rate of short cracks of stainless steel under creep and creep-fatigue conditions. The mean crack initiation lives are predicted to be within an average deviation of about ten percent from the experimental results.

Hunter C.P., Hurst R.C., Creep crack growth studies on alloy H tubes under complex loading conditions, Materials at High Temperature 10 (), – Google Scholar 3. The creep crack growth behaviour of the steel is thus an important concern in the design and residual life estimation of HK 40 tubes.

Residual life prediction of HK 40 tubes has been studied by Estruch and Lyth [I], Kasamara [2] and Gooch et al.

[3]. Jones, Michael D., Nikbin, Kamran M., and Davies, Catrin M. "Load Line Displacement Partitioning in Creep Crack Growth Analyses of H Stainless Steel." Proceedings of the ASME Pressure Vessels and Piping Conference.

Volume 6A: Materials and Fabrication. Prague, Czech Republic. July 15–20, V06AT06A ASME. The crack growth behavior in stainless steel was investigated at °C. Compact tension specimens, 50 mm wide and mm thick, were subjected to fatigue loading under R= load control.

Creep deformation and creep strength are a grain-size sensitive property. Thus a larger grain size improves creep strength. For austenitic stainless steels, SA TPH for example, the code requires a grain size of #7 or coarser, to assure adequate creep strength.

The elevated temperatures where creep occurs lead to other microstructural changes. Tabuchi et al. Creep crack growth properties for 12CrWCoB rotor steel using circular notched specimen.

Int J Pres Ves Pip. 81() Anderson CM, Sandstorm R. Creep crack growth in service exposed weld metal of Cr1Mo. Int J Pres Ves Pip. 78 () The relationship for crack growth rate under steady-state creep dominant conditions in engineering alloys has been shown to be represented by the power law relation [1]: [2] where C* is the steady state creep fracture mechanics parameter and D and ϕ are the creep crack growth (CCG) power law coefficient and exponent, respectively.

The crack growth behavior in a stainless steel has been investigated at °C in air environment. Compact tension specimens were subjected to fatigue, creep and creep-fatigue loading.

The combined effects on crack growth rates of load level and hold time have been examined. Stress intensity factors are found to correlate crack growth rates reasonably well for fatigue crack growth. Books Journals Engineering Research. Applied Mechanics and Materials Advances in Science and Technology International Journal of Engineering Research in Africa Advanced Engineering Forum Journal of Biomimetics, Biomaterials and Biomedical Engineering Materials Science.

Based on processing of a large body of experimental data obtained for austenitic steels andthe authors have determined the coefficients for the equation of crack growth rate as a function of the C* -integral under creep analyze applicability of this equation to Russian austenitic steels, an investigation of the crack growth rate was carried out for the base metal, weld.

The crack growth rate of a cracked component subject to static load at high temperature may be described by the C* relation [9] da dt where D is a constant, φ is a constant equal to (n − 1)/n. Experimental investigations have been carried out to study the creep crack growth in typesCb, and L stainless steel in the temperature range of – K under plane stress condition.

A parameter C//t, which is identical to C* under steady state conditions, was shown to correlate creep crack growth behavior of A class 8 steel for CT and CCT geometries under transient conditions.These specimens were used to perform crack growth studies under secondary and combined loading conditions in Type H stainless steel at °C for up to 1, h, where crack extensions of up to ≈5 mm occurred.

The experimental results are presented and compared to .Materials used to illustrate these effects when subjected to various loading conditions within the creep range include Cr-1Mo steel (annealed), modified 9Cr-1 Mo steel (normalized and tempered.