Menghua Song
Northwestern Polytechnical University
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Featured researches published by Menghua Song.
Science and Technology of Advanced Materials | 2015
Yongqing Cao; Xin Lin; Zhitai Wang; Lilin Wang; Menghua Song; Haiou Yang; Weidong Huang
Abstract Laser remelting has been performed on Ni-30 wt.% Sn hypoeutectic alloy. An anomalous eutectic formed at the bottom of the molten pool when the sample was remelted thoroughly. 3D morphologies of the α-Ni and Ni3Sn phases in the anomalous eutectic region were obtained and investigated using serial sectioning reconstruction technology. It is found that the Ni3Sn phase has a continuous interconnected network structure and the α-Ni phase is distributed as separate particles in the anomalous eutectic, which is consistent with the electron backscatter diffraction pattern examinations. The α-Ni particles in the anomalous eutectic are supersaturated with Sn element as compared with the equilibrium phase diagram. Meanwhile, small wavy lamella eutectics coexist with anomalous eutectics. The Trivedi–Magnin–Kurz model was used to estimate undercooling with lamellar spacing. The results suggest that the critical undercooling found in undercooling solidification is not a sufficient condition for anomalous eutectic formation. Besides, α-Ni particles in the anomalous eutectic do not exhibit a completely random misorientation and some neighboring α-Ni particles have the same orientation. It is shown that both the coupled and decoupled growth of the eutectic two phases can generate the α-Ni + Ni3Sn anomalous eutectic structure.
International Congress on Applications of Lasers & Electro-Optics | 2015
F. Liu; Xin Lin; Menghua Song; Haiou Yang; Jing Chen; Weidong Huang
Microstructure and micro-hardness distribution in single-track laser forming repaired 300M steel were investigated. The microstructure in the repaired zone consisted of the lath martensite. There showed no obvious changes for the microstructure in the repaired zone with the increase of the deposited layer. A series of phase evolutions from the bottom to the top of heat-affected zone (HAZ) occurred: the ferrite and a small amount of carbides→ the ferrite and austenite→ lath martensite. With the increase of the deposited layer, the amount of the carbides reduced and the amount and size of the austenite increased gradually in the HAZ, and the morphology of the austenite changed from strips-like to mesh-like. There were the same variation trends of the hardness from the substrate to the repaired zone between the single-track single-layer repaired and single-track multi-layer repaired specimen. The hardness in the substrate zone was the lowest, it increased rapidly from the bottom to the top of the HAZ. The hardness of the repaired zone was the highest, and varied a little from the bottom to the top of the repaired zone.Microstructure and micro-hardness distribution in single-track laser forming repaired 300M steel were investigated. The microstructure in the repaired zone consisted of the lath martensite. There showed no obvious changes for the microstructure in the repaired zone with the increase of the deposited layer. A series of phase evolutions from the bottom to the top of heat-affected zone (HAZ) occurred: the ferrite and a small amount of carbides→ the ferrite and austenite→ lath martensite. With the increase of the deposited layer, the amount of the carbides reduced and the amount and size of the austenite increased gradually in the HAZ, and the morphology of the austenite changed from strips-like to mesh-like. There were the same variation trends of the hardness from the substrate to the repaired zone between the single-track single-layer repaired and single-track multi-layer repaired specimen. The hardness in the substrate zone was the lowest, it increased rapidly from the bottom to the top of the HAZ. The ha...
Optics and Laser Technology | 2011
Fencheng Liu; Xin Lin; Gaolin Yang; Menghua Song; Jing Chen; Weidong Huang
Journal of Alloys and Compounds | 2011
Fencheng Liu; Xin Lin; Chunping Huang; Menghua Song; Gaolin Yang; Jing Chen; Weidong Huang
Journal of Materials Processing Technology | 2014
Menghua Song; Xin Lin; Gaolin Yang; Xiaoya Cui; Haiou Yang; Weidong Huang
Rare Metals | 2011
Fencheng Liu; Xin Lin; Gaolin Yang; Menghua Song; Jing Chen; Weidong Huang
Journal of Alloys and Compounds | 2016
F. Liu; Xin Lin; Menghua Song; Haiou Yang; Kan Song; Pengfei Guo; Weidong Huang
Journal of Alloys and Compounds | 2015
F. Liu; Xin Lin; Menghua Song; Haiou Yang; Yuanyuan Zhang; Lilin Wang; Weidong Huang
Journal of Wuhan University of Technology-materials Science Edition | 2011
Fencheng Liu; Xin Lin; Menghua Song; Weiwei Zhao; Jing Chen; Weidong Huang
Corrosion Science | 2017
Pengfei Guo; Xin Lin; Jiaqiang Li; Yufeng Zhang; Menghua Song; Weidong Huang