diplomsko delo
Nastja Lenart (Author), Peter Fajfar (Mentor), Gašper Stopar (Co-mentor)

Abstract

V diplomskem delu smo raziskovali preoblikovalnost dupleksnega jekla PK338. Osredotočeni smo bili na konkretno šaržo 114825. Osnovni problem je valjanje na valjalnem stroju blooming, kjer v SIJ Metal Ravne to jeklo s težavo valjajo. Problem je nezmožnost doseganja visokih temperatur, ki bi bile za to jeklo primernejše. Za ponazoritev valjanja smo za raziskovanje uporabili termo-mehanski simulator stanj Gleeble 1500D. Izvedenih je bilo 10 tlačnih preizkusov. Preizkusi so potekali pri temperaturah 1250 °C, 1200 °C, 1150 °C, 1100 °C, 1050 °C, 1000 °C, 950 °C, 900 °C, 850 °C in 800 °C ter hitrosti deformacije 1 s-1. Za ugotovitev optimalne temperature valjanja smo vzorcem pregledali mikrostrukturo. Pri valjanju se želimo izogniti izločanju sigma faze, ki nastopi pri nižjih temperaturah valjanja. Katere faze se izločajo glede na temperaturo valjanja, smo ugotovili s pomočjo analize Thermo-Calc. Pri danih pogojih testiranja je bilo jeklo dobro preoblikovalno.

Keywords

dupleksno jeklo PK338;tlačni preizkus;preoblikovanje v vročem;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL NTF - Faculty of Natural Sciences and Engineering
Publisher: [N. Lenart]
UDC: 669
COBISS: 84877827 Link will open in a new window
Views: 251
Downloads: 42
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Other data

Secondary language: English
Secondary title: workabaillity of duplex steel PK338
Secondary abstract: In the diploma thesis, we have investigated the deformability of duplex steel PK338. We have focused on the concrete batch 114825. The basic problem is rolling on a blooming rolling mill, and this steel is difficult to roll on the SIJ Metal Ravne. The problem is the inability to reach high temperatures that would be more suitable for this steel. A Gleeble 1500D thermo-mechanical state simulator was used to illustrate the rolling process. Ten hot compression tests were performed. The tests were performed at temperatures of 1250 ° C, 1200 ° C, 1150 ° C, 1100 ° C, 1050 ° C, 1000 ° C, 950 ° C, 900 ° C, 850 ° C and 800 ° C and strain rates of 1 s-1. The microstructure of deformed samples was studied to determine the optimum rolling temperature. During rolling, we need to avoid the elimination of the sigma phase that occurs at lower rolling temperatures. Thermo-Calc analysis was used to determine which phases are separated according to the rolling temperature. Under these test condition the steel has good workability.
Secondary keywords: duplex steel PK338;cumpression test;hot working;
Type (COBISS): Bachelor thesis/paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Naravoslovnotehniška fak., Oddelek za materiale in metalurgijo
Pages: XIV, 39 f.
ID: 13328308