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Thermal Stabilities of Ti-600 Alloy Pancake

  • Liying Zeng
  • Xiaonan Mao
  • Quan Hong
  • Yunlian Qi
  • Yongqing Zhao
Conference paper

Abstract

Thermal stabilities at ambient temperature were studied on Ti-600 alloy before and after being exposed at 600 °C for 100 h. Fractography morphologies were investigated, and fracture mechanism analyzed. The results indicated that the strength of the alloy sample after thermal exposure decreased 1% or so, the elongation decreased about 49%, indicating that the plasticity decreased abruptly during the exposure process. For the as-solutioned plus as-aged samples, the cracks originate from the center of the fracture, dimple typed fracture can be found in the fractographies. After thermal exposure, only cleavage facets can be observed in the fractographies, the fractures propagate along the interfaces of lamellar α phases. The fractography of the tensile specimen prior to and after thermal exposure presented the feature of intergranular fracture, transgranular plus intergranular rupture, respectively. These results are caused by the precipitation and the existence of the brittle oxidizing layers. The cracks formed in the oxidizing layers first and then propagated into the matrix during the tensile tests. Oxygen filtration in the surface layer was one of the important reasons for the decrease of plasticity. The major deformation mechanism for Ti-600 alloy without and with thermal exposure is dislocation slips pass-through α bundles, α/β phase boundary slips during the tensile deformation process at ambient temperature, respectively.

Keywords

High temperature ti alloy Ti-600 Thermal stability Tensile elongation Oxygen filtration 

Notes

Acknowledgements

The authors wish to thank financial support from the Major Scientific & Technical Innovation Team Plan Project in Shaanxi Province (No. 2016KTC-27, Seashore Advanced Metals Innovation Team).

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Liying Zeng
    • 1
  • Xiaonan Mao
    • 1
  • Quan Hong
    • 1
  • Yunlian Qi
    • 1
  • Yongqing Zhao
    • 1
  1. 1.Northwest Institute for Nonferrous Metal ResearchXi’anChina

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