Yoshitsugu IRIE's research works Kumamoto University metallographic methods of determining residual creep life

Type IV creep damage occurs in welded joints of high chromium steel in power plant. The method based on the number density of voids is one of the methods to evaluate the residual life.Review on Creep Analysis and Solved Problems IntechOpenApr 04, 2017 is equal to 5 3 obtained by solving the partial equations, is equal to 1 3 and c is closed finite region in steady state creep. Using the residual theorems in complex variable analysis, gives. c(z, z)d(z, z) = 2iRes(z, z)|z, z = z0 E3. In above equation, Res indicates the residual value of (z, z).

Replication Microscopy Techniques for NDE

tion to the problem of determining remain- ing life. The usual method of metallographic investigation, which may involve cutting large pieces from the component so that laboratory preparation and examination can be performed, usually renders the compo- nent unfit for service or necessitates a cost- REMAINING LIFE ASSESSMENT OF A HIGH PRESSURE Baki}, G., et al., Remaining Life Assessment of a High Pressure Turbine Casing in Creep and Low S128 THERMAL SCIENCE Year 2013, Vol. 17, Suppl. 1, pp. S127-S138 common practice to calculate remaining life in terms of creep and occurrence of damage over time, low-cycle fatigue and critical crack size. This approach is important since the studies

Microstructure Degradation after Prolonged Exploitation of metallographic methods of determining residual creep life

Aug 01, 2014The determination of the structural condition and materials exhaustion of creep exposed power plant components is increasingly carried out by field metallographic, examining the relevant components. VGB-TW 507 represents guideline for the assessment of microstructure and damage development of creep exposed materials for pipes and boiler components.Metallographic methods of determining residual creep life metallographic methods of determining residual creep lifeDec 01, 1980Potential metallographic methods of deter- mining residual life fall into two categories. The first is based on measurement of the microstructural feature(s) controlling the creep rate. The second category is based on measuring some direct manifestation of incipient failure (cavities or cracks) and predicting residual life by reference to known kinetics of damage development combined with a

Life assessment using metallographic and mechanical methods

Mar 01, 1994Service- exposed header rupture properties have where a is creep strain; t is time; and 01, 02, been measured using the through-wall plug Life Assessment Methods 87 sample. The remaining creep life of the measurements, in Residual Life Assessment, Non- header can be estimated by isostress direct destructive Examination, and Nuclear Heat Exchanger Materials, ASME, New York, How is residual value of an asset determined?Jun 12, 2020With residual value, it's assumed that the asset has reached the end of its useful life. The residual value of an asset is important when determining the value of an asset at the end of a lease.

Fundamentals of Asset Management

Residual . Life . Determine Life Cycle & Replacement Costs Set Target Levels of . Service (LOS) Determine . Business Risk (Criticality) Optimize O&M Investment . Optimize . Capital . Investment . Determine . Funding . Strategy . Build AM Plan . Fundamentals of Asset Management . 5 . Determining Residual Life . Time (years)FACTORS AFFECTING CREEP AND FRACTURE OF ADVANCED Direct life assessment methods can provide useful information for condition assessment provided that the methods are properly matched to the potential damage mechanisms and locations. View 17 Reads

Evaluation of Service Induced Damage and Restoration

Residual creep life after service was compared to virgin creep life, and correlated to different degradation parameters quantified before creep testing, such as - blade elongation - accumulated service time - service severity factor - y rafting - void density y rafting and void density were evaluated according to the procedures previously described.Evaluating the condition & remaining life of older power metallographic methods of determining residual creep lifeREMAINING LIFE METHODOLOGY . The art in determining a plant's actual status and how much of its entire service life has expired lies in combining analytic considerations, calculation methods, the relevant non-destructive tests, including strain measurements and the correct selection of those components, in which the respective damage is to be metallographic methods of determining residual creep life

Diagnostics of creep in heat-resistant steels II metallographic methods of determining residual creep life

The possibility of calculating the residual life of a metal that functions under creep conditions based on the degree of microdamage of its structure with The main parameter in the proposed calculation method is the specific number of creep micropores, i.e., the number of micropores in Creep Life Estimation of Service Exposed Alloy 625 rupture tests (named series I and series II) were conducted for determining the residual creep life. The series I tests were isostress tests conducted at six different temperatures between 1023 and 1148 K at intervals of 25 K. In all these tests, the test temperatures were higher than the design

Creep Life Estimation of Service Exposed Alloy 625

rupture tests (named series I and series II) were conducted for determining the residual creep life. The series I tests were isostress tests conducted at six different temperatures between 1023 and 1148 K at intervals of 25 K. In all these tests, the test temperatures were higher than the designCreep Damage Evaluation in High-Pressure Rotor Based Furthermore, metallographic replicas made during unit shutdown were observed by scanning electron microscopy, in order to detect creep voids and also to corroborate the results for accu-

Comparing the methods in determining residual life on the metallographic methods of determining residual creep life

Request PDF On Mar 1, 2017, A. Zieliski and others published Comparing the methods in determining residual life on the basis of creep tests of low Comparing the methods in determining residual life on the metallographic methods of determining residual creep lifeRequest PDF On H()LM = T (C + log tre) where H ( ) is the stress function, is the stress, T is the temperature in K, C is the material constant at 1/T = 0, and t re is the time to rupture of material after service. This method for determination of residual life is shown graphically in Figure 1.

Cited by 2Publish Year 1994Author F.V EllisCreep Life Estimation of Service Exposed Alloy 625

Metallographic studies showed extensive precipitation of delta phase at test metallographic methods of determining residual creep life were conducted for determining the residual creep life. The series I tests were isostress tests conducted at six different temperatures between 1023 and metallographic methods of determining residual creep life creep life[l]. This method involves conducting a batch of creep tests at temperatures greater thanCited by 25Publish Year 1980Author C.J. Bolton, B.F. Dy, K.R. WilliamsComparing the methods in determining residual life on the metallographic methods of determining residual creep lifeMay 01, 2017In the case of creep tests with the measurement of elongation, the residual life can be calculated by determining the creep rate in the state established for the adequately selected parameters of creep (stress of the test b, temperature of the test T b).

Cited by 1Publish Year 1995Author D. Milanovi, V. ijaki-eravi, A. Markovi, M. Radovi12.5.3 Remedies for Creep Damage [Aeroengine Safety]

A special type of remedy is determining the damage, i.e. residual life span, in order to reinstall creep-stressed parts (Fig. "Scatter of creep life span data").In some cases, creep-damaged parts such as turbine rotor blades can be regenerated through an HIP process or merely through heat treatment (if the only damage is structural changes such as the formation of brittle phases and/or changes metallographic methods of determining residual creep lifeCited by 15Publish Year 2017Author A. Zieliski, G. Golaski, M. SrokaAssessment of the residual life of a pipeline bend by metallographic methods of determining residual creep lifeSep 01, 1995The residual service life of the components of power plants under conditions of creep can be measured by various methods. As a rule, these methods can be c The nondestructive method is based on the determination of the metallographic A-parameter, i.e., a quantity equal to the ratio of the number of damaged grain boundaries to the total number of boundaries in the direction of the principal

B.F. Dy's research works Imperial College London metallographic methods of determining residual creep life

Metallographic methods of determining residual creep life. metallographic methods of determining residual creep life K.R. Williams. Methods for assessing the residual creep lifetime of components are required either because of operational problems metallographic methods of determining residual creep lifeApplied investigations of the inspection and diagnostics metallographic methods of determining residual creep lifeMay 17, 2011Abstract. The results of applied investigations on the optimization of existing methods and the development of new methods for testing the microstructure of a metal that is used under creep conditions at the steam-power generating facility of a thermal power plant are generalized.

Accelerated Stress Rupture Testing for Creep Life metallographic methods of determining residual creep life

Accelerated stress rupture testing has become a common method for determination of the remaining life of in-service components subject to creep damage at elevated temperatures. Stress and temperature increases have both been used to cause accelerated test failures, although the temperature accelerated tests have been preferred during the last decade.ASTM F3122 - 14 Standard Guide for Evaluating Mechanical metallographic methods of determining residual creep lifeE837 Test Method for Determining Residual Stresses by the Hole-Drilling Strain-Gage Method E915 Test Method for Verifying the Alignment of X-Ray Diffraction Instrumentation for Residual Stress Measurement

ASTM F3122 - 14 Standard Guide for Evaluating Mechanical metallographic methods of determining residual creep life

E3 Guide for Preparation of Metallographic Specimens. metallographic methods of determining residual creep life E837 Test Method for Determining Residual Stresses by the Hole-Drilling Strain-Gage Method. metallographic methods of determining residual creep life E2714 Test Method for Creep-Fatigue Testing. E2760 Test Method for Creep-Fatigue Crack Growth Testing. E2789 ASSESSMENT OF MICROSTRUCTURE DEGRADATION OF Metallographic replication methods have been developed that can correlate either cavitations evolution or changes in carbide spacing with creep-life expenditure. It has been observed that, in many structural applications, cavitation is the principal damage mechanism

A quantitative metallographic study of rafting and metallographic methods of determining residual creep life

In the present work, we study the effect of HIP rejuvenation treatments on the creep behavior and residual life of a pre-crept single crystal Ni-base superalloy of type CMSX-4.12.5.3 Remedies for Creep Damage [Aeroengine Safety]Rejuvenation also seems possible in cast materials (e.g. 713C) as long as they form creep pores, according to Ref. 12.5-9. Another method of determining residual life is a creep test on a damaged engine part. As simple and safe as this procedure seems at first glance, it is rarely meaningful, and rarely are the results transferable to other parts.

12.5.1 Fundamentals of Creep Behavior (Material Properties metallographic methods of determining residual creep life

Figure "Creep behavior of different metals" An important question concerns the threshold temperature for a material, above which creep becomes damage-relevant. This question is not easy to answer. If one ignores the fact that relaxation, e.g. a certain reduction of shot peening-induced residual stresses, already occurs at room temperature in titanium alloys, the temperature above which damage metallographic methods of determining residual creep life10.1016/0924-0136(94)01694-V DeepDyveJun 11, 2020The results of the work carried out and the experimental data gathered for different grades of steel [8,10] make possible to evaluate the residual life of the examined element working in the creep conditions. The service residual life being the conventional portion of the residual life (being evaluated experimentally for a given steel grade) is metallographic methods of determining residual creep life

(PDF) Creep damage assessment and remaining life metallographic methods of determining residual creep life

of view, creep damage assessment is essential to predict residual service life. I n order to optimize maintenance and to safely extend service life beyond t he initial design lifetime, it is(PDF) Creep damage assessment and remaining life metallographic methods of determining residual creep lifeof view, creep damage assessment is essential to predict residual service life. I n order to optimize maintenance and to safely extend service life beyond t he initial design lifetime, it is

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