Določanje kaljivosti jekel za poboljšanje

Hribovšek, Miha (author), Šturm, Roman (mentor)

V diplomskem delu so opisane splošne lastnosti jekel, toplotne obdelave – poboljšanja in osnove trdote. Delo temelji na preizkušanju in vrednotenju kaljivosti štirih jekel: C10, C15, C60 in 16MnCr5. Dotaknili smo se vpliva ogljika in drugih legirnih elementov na kaljivost ter jih z empirično dobljenimi podatki tudi prikazali. Kaljivost je vrednotena po Jominyjevem in Grossmanovem preizkusu prekaljivosti. Prikazana sta vpliv popuščanja na trdoto ter tudi nastala mikrostruktura pred in po popuščanju v povezavi s trdoto. Posamezne materiale smo med seboj primerjali. Ugotovili smo, da se maksimalna nastala trdota viša sorazmerno z vsebnostjo ogljika, globina prekaljivosti pa z deležem drugih legirnih elementov.

• Language: Slovenian
• Keywords: jeklo, preizkusi prekaljivosti, kaljivost, trdota, metalografska analiza
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [M. Hribovšek]
• Year: 2019
• Number of pages: XXVII, 68 str.
• PID: 20.500.12556/RUL-111788
• UDC: 620.17:669.14:539.516(043.2)
• COBISS.SI-ID: 16971035
• Publication date in RUL: 13.10.2019

Secondary language

• Language: English
• Title: The determination of hardenability for steels for quenching and tempering

Abstract

This thesis describes the general properties of steels, heat treatment – quenching and tempering, as does basics of harness. Thesis is based on testing and evaluating the hardness of four steels: C10, C15, C60 and 16MnCr5. We discussed the influence of carbon and other alloying elements based on hardenability and displayed them with empirically obtained data. Hardenability is evaluated with Jominy test as with Grossman hardenability test and the effect of tempering on hardness is shown. Obtained microstructure before and after tempering in relation to hardness is also displayed. We then compared individual materials. We considered that the maximum hardness produced increases in proportion to carbon content and the depth of hardenability increases with proportion of other alloying elements.

• Keywords: steel, hardenability tests, hardness, metallographic analysis