Acta Metallurgica Slovaca

AMS online

Year 2005

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Year 2005 No 2

Achimovičová M., Godočíková E., Baláž P., Kováč J., Šatka A., Billík P.

INFLUENCE OF SODIUM ACETATE ON THE MECHANOCHEMICAL SYNTHESIS OF PBS NANOPARTICLES

Keywords: Mechanochemical synthesis|nanoparticles|soluble salt matrix|morphology|

No 2 (2005), p. 145-151

mag01.pdf (278 kB)

mag01_eng.txt (1 kB)

Pietriková A., Búgel M., Buršák M.

PREPARATION TECHNIQUE OF SILICAGEL FROM SERPENTINE

Keywords: silikagél|serpentinit|oxid kremičitý|kremičité sklá|

No 2 (2005), p. 152-160

mag02.pdf (290 kB)

mag02_eng.txt (2 kB)

Popczyk M., Budniok A., Scholl H., Blaszczyk T.

ELECTROLYTIC PRODUCTION AND CHARACTERIZATION OF NI-CO-P AND NI-W-P LAYERS

Keywords: Amorphous Ni-P matrix|cobalt|tungsten|electrolytic layers|

No 2 (2005), p. 161-165

mag03.pdf (582 kB)

mag03_eng.txt (869 B)

Niedbała J.

ELECTROCHEMICAL PRODUCTION OF NANOCRYSTALLINE LAYERS CONTAINING MOLYBDENUM

No 2 (2005), p. 166-170

mag04.pdf (268 kB)

mag04_eng.txt (973 B)

Krongtong V., Tuengsook P., Homkrajai W., Nisaratanaporn E., Wangyao P.

THE EFFECT OF RE-HEAT TREATMENTS ON MICROSTRUCTURAL RESTORATION IN CAST NICKEL SUPERALLOY TURBINE BLADE, GTD-111

No 2 (2005), p. 171-182

mag05.pdf (1 MB)

mag05_eng.txt (2 kB)

Vrchovinský V., Zrník J., Kvačkaj T., Wangyao P.

THE CREEP BEHAVIOURS AFTER DIFFERENT ROLLING CONDITIONS IN NICKEL BASE ALLOY

No 2 (2005), p. 183-195

mag06.pdf (464 kB)

mag06_eng.txt (2 kB)

Wangyao P., Polsilapa S., Nisaratanaporn E.

THE APPLICATION OF HOT ISOSTATIC PRESSING PROCESS TO REJUVENATE SERVICED CAST SUPERALLOY TURBINE BLADES

Abstract
The present work has an attempt to possibly obtain the most suitable and practicable repair-condition, which could provide the optimal microstructural characteristics by rejuvenation method of hot isostatic pressing (HIP) followed by standard heat treatment for long-term serviced gas turbine blades, a casting nickel base superalloy grade IN-738 operated by Electricity Generating Authority of Thailand (EGAT). The hot isostatic pressing could mostly heal any internal structural voids and cracks (by means of sintering), which were generated during service by creep mechanism. It was found that no any microcrack was observed after longer times of HIP process such as for 3 - 4 hrs. HIP time period. Furthermore, the higher of HIP temperature and/or the longer of HIP time provided the higher of efficiency for microvoid or porosity closing. However, microvoids were still found even after 4 hrs.-HIP process at 1200?C but in very small amount. Therefore, both size and amount of remain microvoids should be considered comparing to both obtained original material and after long-term service one. Furthermore, during solution treatment, coarse carbides and over-exposed gamma prime precipitates, which formed previously at the grain boundaries during service, would dissolve into the matrix. Then specimens will be processed through a series of precipitation aging, which re-precipitates the strengthening phase to form the proper morphology in size and shape as well as distribution that is almost similar to the new one. Metallurgical examination of the microstructure had been performed by utilizing optical microscope and scanning electron microscope after hot isostatic pressing and heat treatment to evaluate the micro-defects elimination.

Keywords: Hot Isostatic Pressing (HIP)|Rejuvenation|Microstructural Repair|Nickel - Based Superalloy|

No 2 (2005), p. 196-206

mag07.pdf (786 kB)

mag07_eng.txt (2 kB)

Michalek K., Sawová M., Pindor J., Střasák P.

NUMERICAL SIMULATION OF THE EXTENT OF THE TRANSITION ZONE IN 150X150 MM CC-BILLETS

Keywords: transition zone|numerical simulation|

No 2 (2005), p. 207-218

mag08.pdf (412 kB)

mag08_eng.txt (842 B)

Rybár R., Végsöová E., Khouri S.

POSSIBILITY ANALYSIS OF THE SOLAR COLLECTORS’ INSTALLATION FOR THE HOT SERVICE WATER PREPARATION SYSTEM ON THE BALCONY RAILINGS OF BLOCKS OF FLATS