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Lomne značilnosti drobnozrnatega mikrolegiranega jekla NIOMOL 490 : magistrska naloga št. 61Vojvodič-Tuma, JelenaV nalogi so obravnavane lomne značilnosti drobnozrnatega mikrolegiranega jekla NIOMOL 490. To jeklo ima feritno bainitno mikrostrukturo ter mejo plastičnosti minimalno 490 MPa, dobro duktilnost pa ... ima še tudi pri temperaturi -60°C. Staranje tega jekla pa duktilne lastnosti poslabša, zato nevarnost krhkega loma postane realna. Lastnosti tega jekla v odvisnosti od temperature uporabe so bile določene tako s statičnimi preizkusi kot tudi z udarnimi preizkusi ter merjenjem lomne žilavosti. Izkazalo se je, da z nateznim preizkusom opravljenim pri nizkih temperaturah lahko sicer določamo konvencionalne mehanske lastnosti jekla, ki jih konstrukter potrebuje za dimenzioniranje, nič pa ne moremo soditi o temperaturni meji uporabnosti jekla. Z udarnimi preizkusi smo zajeli tudi študij vplivov staranja jekla na temperaturo prehoda v krhko stanje določeno s Charpy-V merjenjem žilavosti kot tudi določanje temperature nične duktilnosti z Drop Weight testom. Opravili smo tudi mikrofraktografske preiskave in merjenja lomne žilavosti jekla. Lomna žilavost je bila določena tako s korelacijskimi izrazi po Rolfe-Barsonu in Hahn Rosenfieldu kot tudi z merjenjem J integrala. Zaključimo lahko z ugotovitvijo, da so za določanje temperaturne meje uporabnosti jekla NIOMOL, uporabni le udarni preizkusi merjenja žilavosti, medtem ko statični natezni preizkusi ne dajejo tozadevno uporabnih rezultatov. Zelo koristna pa se je izkazala tudi soodvisnost med rezultati Drop Weight testa in rezultati merjenja lomne žilavosti v območju prehodnih temperatur.Type of material - master's thesis ; adult, seriousPublication and manufacture - Ljubljana : Fakulteta za arhitekturo, gradbeništvo in geodezijo VTOZD gradbeništvo in geodezija, 1990Language - slovenianCOBISS.SI-ID - 130730
Author
Vojvodič-Tuma, Jelena
Other authors
Kržič, Franci
Topics
drobnozrnato mikrolegirano jeklo |
NIOMOL 490 |
lomna mehanika |
lomna žilavost |
natezni preizkusi |
udarni preizkusi |
finegrained microalloyed steel |
NIOMOL 490 |
fracture mechanics |
fracture toughness |
tensile test |
impact test
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Library | Call number – location, accession no. ... | Copy status |
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Faculty of Civil and Geodetic Engineering, Ljubljana | Centralna knjižnica na Jamovi Č 043.3 VOJVODIČ-TUMA J. Lomne IN: 000019989 |
available - reading room |
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Vojvodič-Tuma, Jelena | 09788 |
Kržič, Franci | 04908 |
Source: Personal bibliographies
and: SICRIS
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