Acta Metallurgica Sinica (English Letters) ›› 2010, Vol. 23 ›› Issue (2): 113-120.DOI: 10.11890/1006-7191-102-113

• 研究论文 • 上一篇    下一篇

Effect of microstructure on the mechanical and corrosion behaviors of a hot-extruded nickel aluminum bronze

zhang datong1;Chen Ruiping2;Zhang Weiwen2;Luo Zongqiang2;Li Yuanyuan2   

  1. 1. college of mechanical engineering;south china university of technology;guangzhou;china
    2. 华南理工大学机械与汽车工程学院
  • 收稿日期:2009-08-12 修回日期:2009-11-17 出版日期:2010-04-25 发布日期:2010-04-08
  • 通讯作者: zhang datong

Effect of microstructure on the mechanical and corrosion behaviors of a hot-extruded nickel aluminum bronze

Datong ZHANG, Ruiping CHEN, Weiwen ZHANG, Zongqiang LUO, Yuanyuan LI   

  1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China
  • Received:2009-08-12 Revised:2009-11-17 Online:2010-04-25 Published:2010-04-08
  • Contact: Datong ZHANG

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Abstract:

In this paper, the influence of microstructure on the corrosion behavior of a hot-extruded nickel aluminum bronze was studied. Three kinds of samples subjected to the hot-extrusion, annealing and quenching conditions were prepared and immersion tests in 3.5 % NaCl solution were carried out. Microstructures and corrosion surface morphologies of the samples were observed by SEM. It was found that the retained β' martensite and (α+ΚIII) lamella eutectoid in the as hot-extruded material were eliminated after annealing, and corrosion resistance of the alloy was improved. As to the as-quenched material, its corrosion rate was higher than that of the as hot-extruded material since the volume fraction of β' phase which was anodic to α phase increased after quenching. As regards the mechanical properties, the as-quenched sample possesses the highest hardness and tensile strength among the three kinds of samples, while the as-annealed sample possesses the highest elongation. That is to say, heat treatment plays different roles in the mechanical properties and corrosion resistance of the experimental alloy.

Key words: Nickel aluminum bronze, Heat treatment, Microstructure, Mechanical properties, Corrosion behavior