Integriteta površin pri laserskem pretaljevanju sive in nodularne litine; [Surface integrity in laser remelting of gray and nodular irons] : disertacija; Surface integrity in laser remelting of gray and nodular irons

Faculty of Mechanical Engineering, Lj. (FSLJ)

Integriteta površin pri laserskem pretaljevanju sive in nodularne litine = [Surface integrity in laser remelting of gray and nodular irons] : disertacija

Šturm, Roman

ǂV ǂdelu je podano teoretično ozadje fizikalnih procesov laserskega pretaljevanja površine in njihovih učinkov na modifikacijo tankega površinskega sloja sive in nodularne litine. Eksperimentalni del ... zajema merjenje deformacij tankega vzorca med samim procesom laserskega pretaljevanja površine. Na ta način je s kvantitativnimi podatki popisan časovni vpliv mikrostrukturnih sprememb v modificiranem površinskem sloju na deformacije vzorca oziroma strojnega dela. S tem je pa popisana tudi velikost in narava nastalih napetosti v vzorcu med procesom pretaljevanja glede na različne načine vodenja laserskega snopa po površini vzorca. S spreminjanjem količine dovedene energije in stopnje prekrivanja pretaljenih sledi ter z različnimi načini vodenja laserskega snopa ustvarjamo različne toplotne razmere v tankih ploščatih vzorcih, kar vpliva na naravo in velikost nastalih zaostalih notranjih napetosti v modificiranem površinskem sloju in na stopnjo ukrivljenosti vzorca. Rezultati eksperimentov so potrdili uspešnost procesa laserskega pretaljevanja površine, ki zagotovi nastanek nove finozrnate ledeburitne mikrostrukture visoke trdote v pretaljenem sloju in transformacijo avstenita v martenzit v kaljenem sloju. Sama integriteta površine je poleg mikrostrukturne analize in z meritvami mikrotrdote temeljito popisana še s topografijo pretaljene površine ter analizo narave in velikosti zaostalih notranjih napetosti. Na osnovi vseh teh meritev in analiz je popisano mikrostrukturno dogajanje v modificiranem površinskem sloju pri različnih pogojih laserske obdelave z vidika zagotavljanja najmanjše ukrivljenosti tankostenskih vzorcev in čim manjših zaostalih napetosti natezne narave v pretaljenem površinskem sloju pri ustrezni globini modificiranega sloja.

Type of material - dissertation

Publication and manufacture - Ljubljana : [R. Šturm], 1998

Language - slovenian

COBISS.SI-ID - 2378267

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Grum, Janez, 1946-

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Dr ŠTURM R. Integriteta IN: 00042321	available - reading room

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Šturm, Roman	13026
Grum, Janez, 1946-	03551

Source: Personal bibliographies and: SICRIS

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