Journal
MATERIALS SCIENCE AND TECHNOLOGY
Volume 33, Issue 2, Pages 162-171Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02670836.2016.1165902
Keywords
Acicular ferrite; Microstructure; Non-metallic inclusions; High temperature laser scanning confocal microscopy (HT-LSCM); HSLA steel
Funding
- Federal Ministry for Transport, Innovation and Technology (bmvit)
- Austrian Science Fund (FWF) as well as the Austrian Federal Government [TRP 266-N19]
- Styrian Provincial Government
- Austrian Science Fund (FWF) [TRP 266] Funding Source: researchfish
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By increasing the amount of acicular ferrite (AF) in the microstructure, steel toughness can be improved significantly. The steel composition, cooling rate, non-metallic inclusions and austenite grain size have a strong influence on the formation of AF. The present paper describes and compares two approaches to study AF formation in a titanium-deoxidised high-strength low-alloyed steel and its influencing factors on laboratory scale: route A simulates the formation of AF after heat treatment; route B simulates the formation directly after solidification of the melt. The formation of AF is essentially influenced by the former processing, which also changes the optimum cooling parameters substantially. (Ti,Mn)(x)O-y and (Ti,Al,Mn)(x)OySz are the predominant active inclusion types in the investigated steel.
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