Study of Microstructure and Mechanical Properties of Commercially Pure Sn and Sn-4%Bi Alloys Fabricated by Permanent Mold Gravity Casting and Forging

  • Chonnakan Thongchai Chulalongkorn University
  • Boonrat Lohwongwatana Chulalongkorn University
  • Chedtha Puncreobutr Chulalongkorn University
  • Atchara Khamkongkaeo Chulalongkorn University
  • Thanawat Phetrattanarangsi Chulalongkorn University
  • Burimpak Sakkomolsri Khon Kaen University
  • Pinit Kidkhunthod Synchrotron Light Research Institute, Nakhon Ratchasima, Thailand
  • Narong Chanlek Synchrotron Light Research Institute, Nakhon Ratchasima, Thailand

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Abstract

The influences of 4 wt% bismuth addition and room temperature strain on microstructure and mechanical properties in tin alloys were investigated in this study. Commercially pure tin and Sn-4%Bi alloys were fabricated by permanent mold gravity casting. The samples were then subjected to forging process at room temperature. As-cast microstructures were compared with 0.25 and 0.5 strained samples. Differential Scanning Calorimetry (DSC) was used to confirm the effect of bismuth on undercooling. The recrystallization and grain growth processes were confirmed by grain size distribution and misorientation study using Electron Backscattered Diffraction (EBSD). Furthermore, position and morphology of the bismuth precipitates were investigated by using Field Emission Scanning Electron Microscope (FESEM). X-ray Photoelectron Spectroscopy (XPS) revealed that tin oxide was the main species found on the surface of these alloys. There was no evidence of bismuth oxide on the surface. Furthermore, the Hall-Petch hardness approximation analysis revealed that there were other influences, which increased the hardness beyond the grain refinement effect.

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Author Biographies
Chonnakan Thongchai

Innovative Metals Research Unit, Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

Boonrat Lohwongwatana

Innovative Metals Research Unit, Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

Chedtha Puncreobutr

Innovative Metals Research Unit, Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

Atchara Khamkongkaeo

Innovative Metals Research Unit, Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

Thanawat Phetrattanarangsi

Innovative Metals Research Unit, Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

Burimpak Sakkomolsri

Department of Physics, Khon Kaen University, Khon Kaen 40002, Thailand

Pinit Kidkhunthod

Synchrotron Light Research Institute, Nakhon Ratchasima 30000, Thailand

Narong Chanlek

Synchrotron Light Research Institute, Nakhon Ratchasima 30000, Thailand

Published
Vol 22 No 5, Sep 30, 2018
How to Cite
C. Thongchai, B. Lohwongwatana, C. Puncreobutr, A. Khamkongkaeo, T. Phetrattanarangsi, B. Sakkomolsri, P. Kidkhunthod, and N. Chanlek, “Study of Microstructure and Mechanical Properties of Commercially Pure Sn and Sn-4%Bi Alloys Fabricated by Permanent Mold Gravity Casting and Forging”, Eng. J., vol. 22, no. 5, pp. 171-183, Sep. 2018.

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