Investigation on Strength Characteristics of Steam Generator Welded Joint After Operational Life Using Instrumented Indentation Test Method

Kharchenko, V. V.; Katok, O. A.; Панасенко, А. В.; Rudnitskii, N. P.; Bazhukov, A.V.; Mel’nik, P. E.

doi:10.1007/s11223-013-9458-x

Cited by 3 publications

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“…Over the past 20 years, much research has been conducted to apply indentation testing to large-scale components by taking advantage of the semi-destructive and local nature of indentation. In particular, tensile properties and the residual stress around the welding heat-affected zone have been investigated [30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Application of Macro-Instrumented Indentation Test for Superficial Residual Stress and Mechanical Properties Measurement for HY Steel Welded T-Joints

Lee

et al. 2021

Materials

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HY-80 and HY-100 steels, widely used in constructing large ocean vessels and submarine hulls, contain mixed microstructures of tempered bainite and martensite and provide high tensile strength and toughness. Weld integrity in HY steels has been studied to verify and optimize welding conditions. In this study, the T-joint weld coupons, HY80 and HY100, were fabricated from HY-80 and HY-100 steel plates with a thickness of 30 mm as base metals by submerged-arc welding. Flux-cored arc welding was performed on an additional welding coupon consisting of HY-100 to evaluate the effect of repair welds (HY100RP). Microstructures in the heat-affected zones (HAZ) were thoroughly analyzed by optical observation. Instrumented indentation testing, taking advantage of local characterization, was applied to assess the yield strength and the residual stress of the HAZ and base regions. The maximum hardness over 400 HV was found in the HAZ due to the high volume fraction of untempered martensite microstructure. The yield strength of the weld coupons was evaluated by indentation testing, and the results showed good agreement with the uniaxial tensile test (within 10% range). The three coupons showed similar indentation residual stress profiles on the top and bottom surfaces. The stress distribution of the HY100 coupon was comparable to the results from X-ray diffraction. HY100RP demonstrated increased tensile residual stress compared to the as-welded coupon due to the effect of the repair weld (323 and 103 MPa on the top and bottom surfaces). This study verifies the wide applicability of indentation testing in evaluating yield strength and residual stress.

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Section: Introductionmentioning

confidence: 99%

Application of Macro-Instrumented Indentation Test for Superficial Residual Stress and Mechanical Properties Measurement for HY Steel Welded T-Joints

Lee

et al. 2021

Materials

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“…The procedures described in [1][2][3] and developed at the IPS NASU [5] were used for the characterization of the mechanical properties of steels. The object of investigation was 10GN2ÌFÀ steel, which is widely used in the power engineering for manufacturing steam generators, pressurizers, collectors and other products.…”

mentioning

confidence: 99%

“…The object of investigation was 10GN2ÌFÀ steel, which is widely used in the power engineering for manufacturing steam generators, pressurizers, collectors and other products. To avoid the effect of instrumental errors on the results of determination of the mechanical characteristics by the procedures described in [1,3,5], the hardness tests and instrumented indentation were carried out using the same laboratory testing unit UTM-20 HT [4].…”

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confidence: 99%

On the Determination of the Mechanical Characteristics of Steels from Hardness Test Results

et al. 2014

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A comparative analysis is performed for Brinell hardness values obtained with the help of different testing equipment and procedures for determining the mechanical characteristics of steels from the results of hardness testing used in the nuclear power engineering, including the testing unit and procedure developed Keywords: Brinell hardness, hardness testing instruments, instrumented indentation, characteristics of the mechanical properties.Introduction. The monitoring of the technical condition of in-service equipment in power reactors of Ukraine is carried out using the typical program TPMK-10-01 [1]. According to this document, the characterization of the mechanical properties of structural materials from the results of hardness measurements is performed in accordance with the requirements of the regulations [2]. The analysis of the investigations on the improvement of the existing nondestructive testing methods has shown that the increase in the validity of correlations between the hardness numbers and characteristics of other properties of the material is of particular interest to specialists in this field. With this in view, a new regulation was put to use in Russia [3] which, in addition to the refined correlation relationships to assess the mechanical properties of metals after the different operating lives, covers the use of the instrumented indentation test method.The most important condition for ensuring the stability and validity of the characterization of the mechanical properties from the hardness measurement results is the reliability and accuracy of the result of the hardness measurement by itself. The documents [1-3] for hardness measurements include the domestic production devices and their foreign analogues. The main methods used for determining the hardness are as follows: mechanical, contact-impedance (ultrasonic), dynamic methods, and the instrumented indentation tests. The parameter values obtained using the above methods are converted into the hardness numbers, and the accuracy of the measurement result depends on their correct conversion.A comprehensive set of investigations has been conducted at the Pisarenko Institute of Problems of Strength of the National Academy of Sciences of Ukraine (hereinafter, the IPS NASU), which were aimed at the development and improvement of new methods for the characterization of the strength from the indentation and hardness test results, and also at the elaboration of new original equipment for instrumented indentation testing under laboratory and industrial conditions using different conditions of static and cyclic loading in the indentation force macrorange.The goal of the present paper is to conduct the comparative hardness tests using different measuring instruments for determining the Brinell hardness and to analyze the procedures for determining the mechanical characteristics of the material from the results of hardness measurements according to the documents used in power

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A Setup for Complex Investigation of Mechanical Characteristics of Structural Materials for NPP Equipment

et al. 2019

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Investigation on Strength Characteristics of Steam Generator Welded Joint After Operational Life Using Instrumented Indentation Test Method

Cited by 3 publications

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Application of Macro-Instrumented Indentation Test for Superficial Residual Stress and Mechanical Properties Measurement for HY Steel Welded T-Joints

Application of Macro-Instrumented Indentation Test for Superficial Residual Stress and Mechanical Properties Measurement for HY Steel Welded T-Joints

On the Determination of the Mechanical Characteristics of Steels from Hardness Test Results

A Setup for Complex Investigation of Mechanical Characteristics of Structural Materials for NPP Equipment

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