Mechanical behavior of ultrafine-grained high-Mn steels containing nanoscale oxides produced by powder technology. (15th February 2016)

• Record Type: Journal Article
• Authors: Jeon, Jonggyu; Nam, Seungjin; Kang, Singon; Shin, Jaehyuck; Choi, Hyunjoo
• Is Part Of: Materials & design. Volume 92(2016)
• Page Start: 73
• Page End: 78
• Publication Date: 2016-02-15
• Subjects: Powder metallurgy -- High-Mn steels -- Oxides -- Twinning-induced plasticity -- Grain-boundary strengthening -- Fracture toughness; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2015.12.028
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: A new class of ultrafine-grained high-Mn steels containing nanoscale oxides has been developed by spark-plasma sintering of ball-milled powders. During spark-plasma sintering, nanoscale manganese oxides were generated in Fe–15Mn steel, while nanoscale aluminum oxides were produced in Fe–15Mn–3Al–3Si steel because of the high affinity of aluminum for oxygen. Ultrafine-grained high-Mn steels that contain nanoscale oxides exhibited superior strength without significant loss of toughness, owing to the combined effects of grain refinement, twinning-induced plasticity (TWIP), and dispersion of nanoscale oxides. These new materials have potential for application in powder metallurgy components used in the automotive industry, such as gear sets, connecting rods, and bearing caps, which require high surface hardness as well as good core toughness. Graphical abstract: Highlights: We developed ultrafine-grained high-Mn steels containing nanoscale oxides. Al takes O from Mn to form nano Al oxides because of high oxygen affinity of Al. Grain refinement, TWIP and nanoscale oxides provide superior strength/toughness.