Transactions of Materials and Heat Treatment

Title：Influence of extrusion forming temperature on microstructures and properties of tin bronze

Authors： Hao Weicen Feng Zaixin Hui Jun Su Xiaobo Qi Yueyan

Unit： North University of China

KeyWords： extrusion temperature tin bronze connecting rod bushing microstructure fracture metallography

ClassificationCode：挤压温度；锡青铜; 连杆衬套; 微观组织; 断口金相

year,vol(issue):pagenumber：2018,43(1):160-164

Abstract：

In order to get the spinning billet of connecting rod bushing of tin bronze QSn7-0.2 with good plastic performance, the connecting rod bushing material of tin bronze QSn7-0.2 was regarded as research object, and the anti-extrusion test at 640-760 ℃ was conducted. Then, the influences of extrusion temperature on its microstructures and properties were studied by OM, SEM and tensile test. The results show that with the increasing of extrusion temperature, the elongation and reduction of cross section for tin bronze QSn7-0.2 material reach the highest at 720 ℃. According to the analysis of metallographic structure, the grain size increases gradually with the increasing of extrusion temperature. When the temperature exceeds 720 ℃, the grain has the tendency to accelerate growth. According to the analysis of fracture, when the tin bronze QSn7-0.2 material is extruded at lower temperature, more cleavage fracture surfaces exist in the tensile fracture, and the cleavage surfaces in the tensile fracture gradually reduces with the increasing of extrusion temperature. In conclusion, the tin bronze QSn7-0.2 material obtains the best plastic at 720 ℃ during the extrusion forming.

Funds：

山西省科技攻关资助项目(20120321035-04)

作者简介：郝唯岑（1992-），男，硕士研究生，E-mail：cencen-5616@163.com；通讯作者：冯再新（1968-），男，博士，教授，E-mail：153556845@qq.com

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