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The effect of boron addition on precipitation and hot ductility of 1.5Mn-0.1Nb-Ti carbon steels in As-cast condition
RISE - Research Institutes of Sweden, Swerea.
2016 (English)In: Materials Science Forum (Volume 879): Chapter 2: Contributed Papers, 2016, p. 990-995Conference paper, Published paper (Refereed)
Abstract [en]

Twelve experimental steels with a base composition 1.5wt% Mn, 0.01 wt% V and 0.1 wt% Nb and varying C (0.05, 010 and 0.20 wt%), Ti (20 - 260 ppm) and B (0 - 100 ppm) contents have been systematically examined to quantify the effects of composition on precipitation behavio-ur and hot ductility during simulated continuous casting conditions. Nb-rich precipitates were present in the alloys with 0.10 wt-% C and 0.20 wt-% C. Alloys with 0.05, 010 and 0.20wt% C contained 50 - 100 nm size Ti-Nb carbonitrides. Boron was bound in 20 - 100 nm size boronitrides located in prior austenite grain boundaries. A Gleeble 3800 was used to study hot ductility and strain induced precipitation processes in the alloys. Alloys without B and Ti additions exhibited poor hot ductility at 850°C and 950°C, whereas the 0.05 wt-% C and 0.10 wt-% C alloys showed improved hot ductility (reduction in area 40-50%) by the addition of either >50 ppm B or 250 ppm Ti. The 0.2 wt-% C alloys showed no improvement from B or Ti additions. Examination of fracture surfaces of hot ductility specimens showed that boronitrides were located at prior austenite grain boundaries in alloys containing 80 - 100 ppm of B. Compression-relaxation tests showed that alloying with boron caused a noticeable decrease of the start temperature of straininduced precipitation in the alloys.

Place, publisher, year, edition, pages
2016. p. 990-995
Keywords [en]
Boron steel, Continuous casting, Hot ductility, Solidification, Strain-induced precipitation, Austenite, Boron, Carbon, Carbon steel, Ductility, Grain boundaries, Manganese, Precipitation (chemical), Titanium alloys, Boron steels, Effect of boron addition, Fracture surfaces, Nb-rich precipitates, Prior austenite grain boundaries, Start temperature, Strain induced precipitation, Strain-induced precipitations, Steel castings
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-29375DOI: 10.4028/www.scientific.net/MSF.879.990Scopus ID: 2-s2.0-85000789380ISBN: 9783035711295 (print)OAI: oai:DiVA.org:ri-29375DiVA, id: diva2:1095673
Conference
THERMEC 2016. 29 May 2016 through 3 June 2016
Available from: 2017-05-15 Created: 2017-05-15 Last updated: 2017-11-20Bibliographically approved

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