Abstract
It is well-known that the properties of iron are affected by impurities. With a small amount of sulfur, a drastic hot ductility drop appears near 1000 K. Boron in Fe-P alloy improves the grain boundary brittleness at room temperature by intrinsic cohesion mechanism and competition mechanism. In the present research, the intrinsic effect of boron on the hot ductility drop of Fe-S alloy has been investigated. High purity Fe-60 mass ppm S alloys doped with boron (0 to 70 mass ppm) were melted in a CaO crucible using a high vacuum induction furnace. It is found, for example, by tensile tests at 973 K that the reduction in area (RA) increases from 20% to 50% by the addition of about 20 mass ppm boron to a high purity Fe-60 mass ppm S alloy. However, by adding more boron, the RA decreases and then becomes constant with boron contents higher than 35 mass ppm. It is observed that excess sulfur and boron precipitates as iron-sulfide and iron-boride uniformly distributed in the matrix. The decrease in RA by adding more than 10 mass ppm boron is caused by the strengthening of the matrix due to the increase in the number of iron-boride particles. It should be emphasized that experimental research using highly purified specimens is significant to clarify the inherent properties of metals.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
