Trdnostne lastnosti kovaško varjenega jekla

diplomsko delo Visokošolskega strokovnega študijskega programa I. stopnje Strojništvo

Abstract

Namen diplomskega dela je bil izdelati damaščansko kompozitno jeklo ter ga skovati v vzorce primerne za mehanske preizkuse. V diplomskem delu smo kovaško zvarili damaščansko jeklo iz jekel 15N20 in S235JR. Na pripravljenih vzorcih smo opravili udarni test žilavosti, upogibni preizkus, test trdote ter preučili mikrostrukturo. Vzorci so imeli različno število plasti in bili različno toplotno obdelani. Vzorci so bili kaljeni v olju, kaljeni v dveh sredstvih ter kaljeni v olju in popuščani v peči. Ugotovili smo, da trdota narašča s povečevanjem hitrosti ohlajanja in ne s številom slojev. Največji upogibni raztezek smo dosegli na vzorcu kaljenem v olju in na zraku ter ugotovili, da se vrednosti upogibnega raztezka zmanjšujejo z naraščanjem števila slojev kompozita.

Keywords

diplomske naloge;maloogljično jeklo;evtektoidno jeklo;kovaško varjenje;trdota;udarna žilavost;mikrostruktura;

Data

Language:	Slovenian
Year of publishing:	2020
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[R. Žos]
UDC:	621.791.42:669.14:539.4(043.2)
COBISS:	17030939
Views:	1164
Downloads:	196
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Strength characteristics of metal welded steel
Secondary abstract:	The purpose of diploma thesis is to forge damascus composit steel and forge it into samples for mechanical tests. In my thesis we forge welded damascus steel from 15N20 and S235JR steels. On prepared samples we did Charpy impact test, deflection test, hardness test and studied the microstructure. The samples had different number of layers and were differently heat treated. They were quenched in oil, quenched in oil and air and some were quenched in oil and then tempered in furnace to release internal stresses. We figured out that the speed of heat treatment has the biggest influence on hardness. The highest value of deflection appeared when we heat treated the sample in oil and air. Deflection was decreasing when we increased the number of layers of composit.
Secondary keywords:	low carbon steel;evtectoid steel;forge welding;hardness;impact toughness;microstructure;
Type (COBISS):	Bachelor thesis/paper
Study programme:	0
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. v Ljubljani, Fak. za strojništvo
Pages:	XVIII, 45 str.
ID:	11366545