scholarly journals Application of Small Punch Test Method in Studies of the 14MoV63 Steel Before and After Revitalisation

2015 ◽  
Vol 60 (1) ◽  
pp. 47-50 ◽  
Author(s):  
J. Kłaput
Keyword(s):  
Elevated Temperatures ◽  
Test Method ◽  
Small Punch Test ◽  
Small Punch ◽  
Sudden Loss ◽  
Term Operation ◽  
Brittle Transition ◽  
Punch Test ◽  
Before And After

Abstract The paper presents the results of studies of the chromium-molybdenum-vanadium steel designed for operation at elevated temperatures. The material was examined after long-term operation and after the revitalising heat treatment. Studies were performed by conventional methods and small punch test. Curves of ductile-brittle transition were plotted from the Charpy V-notch impact tests and were next compared with the curves of sudden loss of ductility obtained in the small punch test. Additionally, for the material before and after revitalisation, the values of temperatures Tpk and Tnuc were calculated using the method of inflection point.

scholarly journals Evaluation of embrittlement of long-term used CrMoV rotors by small punch test.

1988 ◽  
Vol 37 (421) ◽  
pp. 1178-1184 ◽  
Author(s):  
Yorimasa TAKEDA ◽  
Yuusaku TAKANO ◽  
Akitsugu FUJITA ◽  
Toru GOTO
Keyword(s):  
Small Punch Test ◽  
Small Punch ◽  
Punch Test

Study of Fatigue Properties of Materials through Cyclic Automated Ball Indentation and Cyclic Small Punch Test Methods

2017 ◽  
Vol 734 ◽  
pp. 273-284 ◽  
Author(s):  
Raghu V. Prakash
Keyword(s):  
Fatigue Property ◽  
Test Method ◽  
Life Assessment ◽  
Remaining Life ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test ◽  
Ball Indentation ◽  
Fatigue Data ◽  
Cycles To Failure

One of the important inputs while estimating the remaining life of critical components is the fatigue property of materials. Fatigue data, in the form of stress vs. cycles to failure (or) strain vs. cycles to failure (or) fatigue crack growth rate data is used to predict the residual life. Material’s fatigue property degrades with time and usage; hence, it is appropriate to use the current properties for remaining life assessment. Often the quantity of material available for generating fatigue data is limited, especially, if the material is scooped out of existing component of a power plant. Further, fatigue response being probabilistic in nature, requires multiple specimens to be tested at any given stress/strain levels. This has prompted us to develop test procedures to determine the fatigue data of materials from a limited volume of material. This paper presents the results of cyclic ball indentation test method as well as cyclic small punch test method that is used to generate the fatigue data at different stress levels. There are several fine details relating to these test techniques – viz., establishing a equivalent damage criteria for failure life with standard LCF/HCF test specimens. The influence of one of the variables, viz., friction at the specimen-tool interface of a small punch test is investigated through numerical simulation and the results are presented here.

Correlation of Tensile Properties of Pressure Vessel Steels by Shear Punch and Small Punch Test Methods

2012 ◽  
Author(s):  
Raghu V. Prakash ◽  
T. Ramesh ◽  
N. Raju ◽  
S. Suresh
Keyword(s):  
Tensile Properties ◽  
Pressure Vessel ◽  
Test Method ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test ◽  
Nominal Size ◽  
Shear Punch Test ◽  
Pressure Vessel Steels ◽  
Shear Punch

A shear punch test is a very useful small specimen test method for evaluating the mechanical properties of in-service components, in view of the requirements of small size sample material. Typically disks of nominal size 10 mm diameter, having a thickness of 0.5 mm or less is used to extract the tensile properties through measurement of load-displacement responses. This paper presents the results of shear punch tests on pressure vessel steels and its correlation with yield stress and ultimate tensile stress obtained using ASTM standard specimens. Small punch test is similar to shear punch test, except that the indenter is spherical in shape, and as a consequence the material under the punch will be subjected to biaxial state of stress. The tensile response of materials derived by small punch test is correlated with standard tensile tests.

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