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Li N.,Wuhan University of Science and Technology | Wu K.M.,Wuhan University of Science and Technology | He T.Q.,Wuhan University of Science and Technology | Wang H.H.,Wuhan University of Science and Technology | And 3 more authors.
Science and Technology of Welding and Joining | Year: 2014

The weldability and mechanical properties of an ultrahigh strength wear resistant steel were substantially improved by the addition of a small amount of Ca-Mg-RE-Zr composite (1·5 kg t-1) to the molten steel during the refining stage. Based on optical and electron microscopy examinations, the observed improvements were attributed to the enhanced pining effect of inclusions on the original austenite grain boundaries within the coarse grained heat affected zone, as well as the inclusion induced acicular ferrite formation within the fine grained heat affected zone. © 2014 Institute of Materials, Minerals and Mining. Source


He T.Q.,Wuhan University of Science and Technology | Wu K.M.,Wuhan University of Science and Technology | Anatolii T.,Wuhan University of Science and Technology | Yu H.W.,WISCO Echeng Iron and Steel Co. | Xiong Y.Z.,WISCO Echeng Iron and Steel Co.
Wear | Year: 2013

The abrasive wear performance of high-strength steels was evaluated by two kinds of designed laboratory test methods, i.e. the sliding abrasion test and the stirring wear test. Optical microscopy and scanning electron microscopy were utilized to observe the worn surfaces, microstructures and inclusions. The tested results show that the feeding of a small amount (1.5 kg/t) of Ca-Mg-RE-Zr (RE, Rare Earth) composite cored wire replacing 0.31 (wt%) expensive Ni in the steels resulted in better mechanical properties and much better abrasive wear performance, which was attributed to the modification of inclusions and improvement of impact toughness by the addition of Ca-Mg-RE-Zr composite cored wire. Microcutting, microploughing and scratching were the main wear mechanisms in abrasive wear tests. The abrasive loss of high-strength steels was larger in the wet wear condition than that in the dry wear condition in the sliding abrasion test, which was caused by the increasing corrosion wear and reducing debris accumulation. © 2013 Elsevier B.V. Source

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