Effect of stress relieving heat treatment on surface topography and dimensional accuracy of incrementally formed grade 1 titanium sheet parts

Amar Kumar Behera*, Hengan Ou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)
230 Downloads (Pure)

Abstract

The forming of parts with an optimized surface roughness and high dimensional accuracy is important in many applications of incremental sheet forming (ISF). To realize this, the effect of stress relieving heat treatment of grade-1 Ti parts performed before and after forming on the surface finish and dimensional accuracy was studied. It was found that heat treatment at a temperature of 540 °C for 2 h improves the surface finish of formed parts resulting in a surface with little or no visible tool marks. Additionally, it improves the dimensional accuracy of parts after unclamping from the rig used for forming, in particular, that of parts with shallow wall angles (typically <25°). It was also noted that post-forming heat treatment improves the surface finish of parts. The surface topography of formed parts was studied using interferometry to yield areal surface roughness parameters and subsequently using secondary electron imaging. Back-scatter electron microscopy imaging results coupled with energy-dispersive X-ray (EDX) analysis showed that heat treatment prior to forming leads to tool wear as indicated by the presence of Fe in samples. Furthermore, post-forming heat treatment prevents curling up of formed parts due to compressive stresses if the formed part is trimmed.

Original languageEnglish
Pages (from-to)3233-3248
JournalInternational Journal of Advanced Manufacturing Technology
Volume87
Issue number9-12
Early online date12 Apr 2016
DOIs
Publication statusPublished - 01 Dec 2016
Externally publishedYes

Keywords

  • Heat treatment
  • Incremental sheet forming
  • Stress relieving
  • Surface roughness
  • Titanium
  • Trimming

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Software
  • Mechanical Engineering
  • Computer Science Applications
  • Industrial and Manufacturing Engineering

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