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The influence of water environment on fatigue crack growth behaviour of high strength low alloy steel.

100%

Matocha K.

Inżynieria Materiałowa

2001

tom R. XXII, nr 5

617-619

The effect of loading frequency (0,1-10 Hz) and temperature (4-75 degrees centigrade) on fatigue crack growth behaviour in water environment were studied on low alloy high strength steel of grade 38MnSiCr2Ni2Mo. Fatigue crack growth rates in distilled water increased significantly compared with these in air for loading frequency lower or equal than 1 Hz. Besides the loading frequency the kinetics of fatigue crack growth in studied steel is strongly influenced by delta K and water temperature.

The evaluation of materials properties of inservice components by small punch tests

100%

Matocha K.

Journal of KONES

2009

tom Vol. 16, No. 4

315-321

Residual lifetimes and/or structural integrity assessments of critical components of mechanical plants and/or steel structures reąuire the knowledge of actual mechanical properties of the components' materials, because the material properties could be reduced throughout a service life by ageing. the use of standardised mechanical test techniques for determination of actual mechanical properties of the components under operation can cause its considerable damage due to size of necessary testing material and following repairs by welding. The need of a large amount of testing material can be eliminated by new advanced testing method based on „ non destructive " sampling of a small amount of testing material from the component surface. the mechanical characteristics are then determined by Small Punch) Tests (SPT). This paper describes the use of this advanced test technique for determination of tensile properties and fracture characteristics (FATT, J IC) of materials. The small punch test technique provides at present time a vehicle for determination of actual tensile and fracture properties necessary for optimisation of operating procedures and inspection intervals as well as for repairs strategies and residual lifetime assessment.

Determination of actual tensile and fracture properties of steam turbine rotor by small punch tests

51%

Matocha K. , Purmensky J. , Mišcicki M.

Advances in Materials Science

2007

tom Vol. 7, nr 2(12)

32-39

The paper summarizes the determination of tensile properties (Yield Stress, Tensile Strength) and fracture characteristics (FATT, fracture toughness JIC) by Small Punch (SP) tests of material samples taken from regulation stage No1 and regula-tion stage Nol9 of steam turbine rotor of 13UCK60 w Ec IV turbine in Łodž Power Plant by Rolls-Royce SSamTM-2 scoop sampling machine.