.... The mechanical properties at ambient temperature (hardness and upper yield point), the microstructure and creep resistance have been considered, on the whole, to define Larson-Miller stress-parameter curves for each of the above conditions. The method obtained allows for a reliable assessment of the residual...

...Microstructure Metallography Replication FMR Sigma phase embrittlement stress relaxation cracking creep INTRODUCTION Abstract During plant shutdown maintenance, some components cannot be removed out of service immediately for metallurgical examination due to high cost involved and loss...

... damage development that leads to differences in macroscopic SCC initiation behavior are discussed. PWR UNS N06600 (Alloy 600) stress corrosion cracking stress corrosion crack initiation intergranular attack grain boundary carbide creep INTRODUCTION Although Ni-base UNS N06600 (Alloy 600) has been...

... monitoring systems not performing within specification for extended periods of times (typically 1-5 years). The typical failure mode has been creep in seam welds. The consequence of failure for high energy piping can be severe and the effect of unexpected or unknown displacements cannot be quantified when...

... remains a concern. Creep tests have been performed on bare, annealed, and coated Fe and Ni-based alloys at temperature ranging from 600 to 800°C. Results indicate that coating application has a marginal effect on the substrate creep properties as long as the coating is considered as non-load bearing...

... tube remaining life. Included in this paper is an explanation of how anticipated changes in process conditions can be evaluated with Omega simulations to assess the impact of those changes on coker furnace tube life. Creep Omega refinery cokers coking furnace tubes corrosion sulfidation...

... (1) Retired from NIMS(National Institute of Material Science) Abstract 9Cr steel has been widely used for boiler tube, header and pipe because of the excellent high temperature strength. It is well known that the creep failure is anticipated in weld joint, like Type four cracking due to the low...

.... revisions based on user problems). T23 is similar to ASTM A213, Grade T22 alloy which has wide usage and great success in pressure vessel construction. T23 is essentially a low-carbon grade of T22, except that the 1% molybdenum has been replaced with tungsten for added creep resistance. It also has vanadium...

... (765) 675-9964 + 49-2392- 55-2945 The open element heating coil requires a material that is not only resistant to cyclic oxidation, but also resistant to creep or sag. Since the unsupported length of the coil can sag and come into contact with adjacent coils, this is a serious concern for a short...

...(2) Group Leader, Strategic Asset Management The “Additions” are the variation that differentiates the base niobium containing HP alloy from the micro-alloyed version and the details of the level of such additions are frequently maintained as proprietary information of the various vendors. CREEP...

... and the excessive operating temperature of the pigtails (820°C) counter this hypothesis for the alloy 800HT. Taking all of these facts into account, it is possible to state that the tube degradation may be caused by a combination of creep and internal oxidation cracking, rather than by SRC or a classic creep...

...Oxidation results for PC and CVD coated specimens are also plotted in fig. 1 . As expected, mass gains were very low because of the formation of a thin, adherent alumina scale. Abstract Combined creep and corrosion testing, as well as creep testing of pre-oxidized specimens has been used...

...Abstract This study aimed at assessing the mechanical properties of tubbings operating under conditions of elevated temperatures. Hot tensile (standard ASTM-E 21) and creep (standard ASTM-E 139) measurements were made in tubbings of Stainless Steel (A268/Tp 446 and APM/ kanthal alloy) at different...

... been developed for use in advanced coal fired power boilers. The grade is designed for high creep- and oxidation resistance, high structural stability and good fabricability. It can be utilized at temperatures up to around 700°C. The temperature strength is reached by precipitate strengthening through...

... and troubleshooting these failures. These tube failures represent typical failures that occur in ethylene cracking furnace tubes, and were caused by different damage mechanisms, i.e. creep/carburization, thermal fatigue/carburization, and thermal shock. Appropriate preventive solutions are suggested to overcome...

... weld metal pressurized water reactor corrosion grain boundary oxidation creep crack tip analysis INTRODUCTION Low potential stress corrosion cracking (LPSCC) of nickel-based alloy is known to be an important degradation phenomenon in the primary water of pressurized water reactors (PWRs)^{( 1}...

...-performance materials of construction are required. Nickel-base alloys have been shown to offer reliable service for long periods of time resulting in high product output and low lifetime costs. Nickel alloys Hot Corrosion High Temperature Oxidation Carburization Sulfidation Creep Stress Rupture Oil...

...Abstract Performing remaining creep life calculations using average values of temperature (T) and pressure (P) under conditions where these vary considerably produced unrealistic results. A case is described in which these variables were modeled to express T and P as functions of time. The case...

... of hydrogen on mechanical properties during a shut–down operation and on creep properties has been considered. Mechanical property testing of steels exposed to the above stated environments was conducted in order to determine the effect of hydrogen. Tensile, Charpy V-Notch CVN, and fracture toughness values...

...Titanium alloys stress corrosion cracking creep radioactive waste storage ground water INTRODUCTION The current reference material for the outer barrier in the high level nuclear waste package for the Yucca Mountain Project is Alloy 22 (UNS N06022), which is emplaced under titanium Grade 7...