Transactions of Materials and Heat Treatment

Title：Analysis on microstructure of hot forging billet H13 in the spray forming

Authors： Liu Jianyong1 2 Yang Wei1 Tao Changcheng3

Unit： 1.Hubei University of Automotive Technology 2. Wuhan University of Technology 3.Dongfeng Motor Co. Ltd.

KeyWords： steel H13 spray forming hot forging die microstructure analysis

ClassificationCode：

year,vol(issue):pagenumber：2015,40(7):146-150

Abstract：

Metallographic, SEM and EDS analysis and HRC hardness test were implemented on deposition billet of hot forging die H13 in the spay forming. The results show that the solidification grain in the spay-formed H13 is fine equiaxed crystal with nonuniform distribution. The spray-formed microstructures are composed of bainite, martensite, retained austenite, and a small amount of carbide and impurites. The macrostructure of the spay-formed deposition billet is of lamellar characteristic distinctly. The porosity is different between layers, and higher porosity is found at both the bottom and the top of deposition billet. The reasons of nonuniform distribution of deposition billet hardness are high porosity and nonuniform microstructure. The nonuniform microstructure of deposition billet should attribute to the uneven of temperature and the speed of the metal stream during the whole spray process.

Funds：

湖北省教育厅青年基金（Q20131804）；湖北省现代汽车零部件技术重点实验室开放基金（2012-01）；湖北汽车工业学院博士基金（BK201206）

刘建永（1978-），男，博士研究生

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