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Title:Lastnosti in mikrostruktura avstenitnih nerjavnih jeklenih peskov
Authors:ID Bončina, Tonica (Author)
ID Zupanič, Franc (Author)
ID Anžel, Ivan (Author)
ID Križman, Alojz (Author)
ID Inštitut za kovinske materiale in tehnologije (Copyright holder)
Files:.pdf Materiali_in_tehnologije_2000_Boncina_et_al._Lastnosti_in_mikrostruktura_avstenitnih_nerjavnih_jeklenih_peskov.pdf (2,74 MB)
MD5: 903C62BA80FF242395F2ECE713C39CD7
PID: 20.500.12556/dkum/e935a680-36e0-4445-9af8-9f9019475547
 
URL http://mit.imt.si/Revija/izvodi/mit0012/18boncina.pdf
 
Language:Slovenian
Work type:Scientific work
Typology:1.04 - Professional Article
Organization:FS - Faculty of Mechanical Engineering
Abstract:V naši raziskavi smo primerjali lastnosti in mikrostrukturo dveh vrst litih avstenitnih nerjavnih jeklenih peskov. Jekleni peski A so bili izdelani z nizkotlačno asimetrično vodno atomizacijo v odprti komori, peski B pa s plinsko atomizacijo. Primerjava napak in obrabne obstojnosti med peski A in B je pokazala, da imajo peski B manjši delež votlosti, večji delež okroglosti in boljšo obrabno obstojnost. Peski A so prevlečeni z debelo oksidno plastjo, ki nastane zaradi reakcije delcev s kisikom ali vodno paro med sferoidizacijo ali po njej. To je tudi vzrok za velik delež peskov nepravilne oblike in votlosti pri peskih A. Čeprav imajo peski A in B koncentracijo zlitinskih elementov v predpisanih mejah, pa se mikrostrukturi razalikujeta. Manjši delež C, Mn in Ni v peskih A vpliva, da se v mikrostrukturi poleg avstenita pojavlja še delta ferit, medtem ko imajo peski B popolno avstenitno mikrostrukturo. Ustrezno kvaliteto avstenitnih nerjavnih jeklenih peskov se lahko doseže: - če poteka atomizacija v razmerah, pri katerih na površini delcev ne nastaja trdna oksidna plast - če je kemijska sestava nerjavnega jekla taka, da je mikrostruktura po atmomizaciji v celoti avstenitna (dovolj visoka koncentracija C, Mn in Ni pri dani koncentraciji Cr).
Keywords:avstenitni nerjavni jekleni peski, mikrostruktura, oksidna plast, atomizacija
Publication status:Published
Publication version:Version of Record
Year of publishing:2000
Number of pages:str. 93-97
Numbering:Letn. 34, št. 1/2
PID:20.500.12556/DKUM-28050 New window
ISSN:1580-2949
UDC:669.14.018.8:669-492:620.18
ISSN on article:1580-2949
COBISS.SI-ID:216234 New window
NUK URN:URN:SI:UM:DK:T4I8BTMZ
Publication date in DKUM:01.06.2012
Views:1615
Downloads:114
Metadata:XML DC-XML DC-RDF
Categories:Misc.
:
BONČINA, Tonica, ZUPANIČ, Franc, ANŽEL, Ivan and KRIŽMAN, Alojz, 2000, Lastnosti in mikrostruktura avstenitnih nerjavnih jeklenih peskov. Materiali in tehnologije [online]. 2000. Vol. 34, no. 1/2, p. 93–97. [Accessed 11 April 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=28050
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Record is a part of a journal

Title:Materiali in tehnologije
Shortened title:Mater. tehnol.
Publisher:Inštitut za kovinske materiale in tehnologije
ISSN:1580-2949
COBISS.SI-ID:106193664 New window

Secondary language

Language:English
Title:Properties and microstructure of the austenitic stainless steel shot
Abstract:This paper deals with the properties and the microstructures of two cast austenitic stainless steel shots. The stainless steel shot A was made by asymmetric water atomisation in an open chamber and shot B by gas atomisation in an inert atmosphere. The shot B possesses a smaller fraction of voids, a large fraction of spherical shot and superior wear resistance. At the shot A the reaction of particles with oxygen and water vapour during the atomisation caused the formation of a thick oxide layer on the surface of the particles and voids. The oxide layer is one of the main reasons for the irregular shape of the particles and voids in the shot A. Despite the chemical compositions of both shots being similar and fulfillig the adequate specifications, their microstructures differ considerably. The microstruture of the shot B is fully austenitic, but the microstructure of the shot A consists of austenite and delta ferrite because of the smaller content of the gamma forming elements (C,Mn and Ni). The results of investigation suggest that a better quality of austenitic stainless steel shot can be obtained by: - Melt atomisation without the presence of oxygen and water vapour to prevent the formation of a thick oxide layer on the particles. - Convenient selection of the chemical composition in order to obtain fully austenitic microstructure.
Keywords:austenitaic stainless steel shot, microstructure, oxide layer, atomisation


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