Determination of Failure Causes of a Steam Turbine Casing

2011 ◽  
Vol 183 ◽  
pp. 37-42 ◽  
Author(s):  
Janusz Cwiek ◽  
Jerzy Łabanowski ◽  
Santina Topolska ◽  
Maria Sozańska
Keyword(s):  
Steam Turbine ◽  
Impact Test ◽  
Cast Steel ◽  
Charpy Impact ◽  
Hardness Test ◽  
Charpy Impact Test ◽  
Outer Shell ◽  
Turbine Casing ◽  
Vickers Hardness Test

The paper presents results of research and failure analysis undertaken to determine failure causes of a steam turbine casing. After 130,000 hours of service the crack in a outer shell of the turbine casing was found. The inner shell of the casing was made of cast steel grade G21CrMoV5-7, and the outer shell of grade G20CrMo4-5. Following research were performed in order to determine causes of the casing failure: chemical analysis; microstructure examinations with the use of light microscope, scanning electron microscope (SEM); mechanical properties examinations using the Charpy impact test, and Vickers hardness test; fracture mode evaluation with SEM.

Verification of the Charpy Impact Test Capability to Determine the Constants of the Johnson-Cook Model

2016 ◽  
Vol 250 ◽  
pp. 197-202 ◽  
Author(s):  
Michal Stopel Stopel ◽  
Dariusz Skibicki
Keyword(s):  
Experimental Test ◽  
Impact Test ◽  
Charpy Impact ◽  
Material Model ◽  
Charpy Impact Test ◽  
Feasibility Analysis ◽  
Model Parameters ◽  
Strain Rates ◽  
Split Hopkinson

Feasibility analysis of replacing split Hopkinson bars test by Charpy impact test for determination of Johnson-Cook’s material model parameters. The results show that the Charpy impact test may, due to the strain rates achieved, successfully replace the mentioned experimental test. Moreover the results shows that some further studies should be conducted to improve efficiency of the proposed method.

Study of the Impact Properties of Steel 25Mn

2011 ◽  
Vol 704-705 ◽  
pp. 1035-1040
Author(s):  
Da Yong You
Keyword(s):  
Crack Propagation ◽  
Impact Test ◽  
Charpy Impact ◽  
Hardness Test ◽  
Fracture Morphology ◽  
Charpy Impact Test ◽  
Deformation And Fracture ◽  
The Difference ◽  
Hot Rolled ◽  
The Impact

The Charpy impact test、hardness test、microstructure and morphology analysis of impact fracture by SEM were introduced to research the difference of impact toughness on 25Mn, which were in the station of hot-rolled、normalized and quenched & tempered. The resulted showed that the changes of load、deformation and energy exhaust in difference stage of deformation and fracture could be gained by Charpy impact test. 25Mn in quenched & tempered has more deformation resistance and deformation property than which in other stations. The total impact values was 6J higher than which in normalized in average, however, the crack propagation values was 16.78J higher in average. Ductile-brittle property of the material can be estimated by the analysis of crack formation values、crack propagation values and fracture morphology on samples.

Comparative Study on Microwave and Conventional Joining of Thermoplastic

2018 ◽  
Vol 280 ◽  
pp. 277-283
Author(s):  
C. Palanisamy ◽  
S. Kumar Selearajen ◽  
K. Siva
Keyword(s):  
Impact Test ◽  
Charpy Impact ◽  
Acrylonitrile Butadiene Styrene ◽  
Hardness Test ◽  
Charpy Impact Test ◽  
Microwave Energy ◽  
Environmental Friendly ◽  
Key Features ◽  
Joining Process ◽  
Butadiene Styrene

Industrialisation and the development of manufacturing process nowadays demand a more efficient and environmental friendly production. Microwave energy can be seen as the alternative heating application to meet the demands due to its ability to heat materials volumetrically. In this study, the usage of microwave energy to join thermoplastic is investigated. One of the key features of thermoplastic is the ability to shape when heated to their glass transition temperature and return to the moulded shape when it is cooled. Engineering thermoplastic Acrylonitrile-butadiene-styrene (ABS) was used as member while charcoal powder was used as susceptor material. The joining process was carried out with timing varying from 3 to 5 minutes, adhesive method and direct heating method. Upon the completion of joining, tensile test, 3 points test, hardness test and charpy impact test were conducted and compared to determine the strength of the joint.

scholarly journals Material Characterization of 316L Stainless Steel After Being Subjected To Cryogenic Treatment

2013 ◽  
pp. 156-160
Author(s):  
Mohd Touseef Nauman ◽  
S. Rasool Mohideen ◽  
Nasreen Kaleem
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Impact Test ◽  
Cryogenic Treatment ◽  
Charpy Impact ◽  
Hardness Test ◽  
Charpy Impact Test ◽  
Deep Cryogenic Treatment ◽  
Shear Area

Post processing of materials is necessary to suit them for the intended requirements. The properties of stainless steel of grade 316L cannot be influenced with further processing such as hot working [1]. Thus the current study aims at investigating the properties of stainless steel of grade 316L after being subjected to deep cryogenic treatment. The specimens from both cryogenically treated and untreated conditions were subjected to Tensile Test, Charpy Impact Test, Rockwell Hardness Test, Microstructure and Percentage Shear Area Analysis and the results thus obtained are discussed in this paper. The results have shown that cryogenic treatment has improved the hardness and strength.

Determination of the limit of forced elasticity in the charpy impact test

1987 ◽  
Vol 29 (9) ◽  
pp. 2205-2207
Author(s):  
G.V. Kozlov ◽  
R.A. Shetov ◽  
A.K. Mikitayev
Keyword(s):  
Impact Test ◽  
Charpy Impact ◽  
Charpy Impact Test
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