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In situ x-ray observation of bainitic transformation of austempered silicon alloyed steel
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-9100-7982
Tsinghua University.
2009 (English)In: Journal of Materials Research, ISSN 0884-2914, E-ISSN 2044-5326, Vol. 24, no 4, p. 1559-1566Article in journal (Refereed) Published
Abstract [en]

The in situ x-ray diffraction observations of the bainitic transformation were conducted by using the high-temperature x-ray diffraction technique. The volume fraction and carbon content of austenite depend on the transformation temperature. The d{110} value of bainitic ferrite decreases with increasing austempering temperature, which is related to the decrease of carbon concentration in bainitic ferrite. Asymmetry diffraction peaks are obtained for samples at the early stage of transformation at any austempering temperatures. This asymmetry diffraction peak after the formation of bainitic ferrite could be attributed to a heterogeneous distribution of carbon in different regions of austenite and show that two types of austenite with different carbon contents, low-carbon austenite (?LC) and the high-carbon austenite (?HC), exist during the transformation. The microstructure after cooling down to room temperature is presented to show the effectiveness of the x-ray diffraction analysis.

Abstract [sv]

In situ röntgendiffraktionsobservationer av den bainitiska omvandlingen genomfördes med hjälp av högtemperaturröntgendiffraktionsteknik. Volymandelen och kolhalten för austeniten beror av omvandlingstemperaturen. Värdet av d{110}för den bainitiska ferriten minskar med ökande bainithärdningstemperatur, vilket kan relateras till minskningen av kolhalten i den bainitiska ferriten. Asymmetriska diffraktionstoppar erhålls för proven i början av omvandlingarna vid alla bainithärdningstemperaturer. Denna asymmetriska diffraktionstopp efter bildningen av ferrit kan förklaras med en heterogen fördelning av kol i olika områden av austeniten och visar på existensen av två olika typer av austenit med olika kolhalter, lågkolhaltig austenit (γLC) och högkolhaltig austenit (γHC) under omvandlingen. Mikrostrukturen efter avkylningen har till rumstemperatur har även undersökts för att visa inverkan av röntgendiffraktionsanalyserna.

Place, publisher, year, edition, pages
2009. Vol. 24, no 4, p. 1559-1566
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-7096DOI: 10.1557/JMR.2009.0178ISI: 000267207700030Scopus ID: 2-s2.0-65349108734Local ID: 56a09a70-30c5-11de-bd0f-000ea68e967bOAI: oai:DiVA.org:ltu-7096DiVA, id: diva2:979983
Note
Validerad; 2009; 20090424 (esa)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Vuorinen, Esa

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