Evolution behavior of liquid film in the heat-affected zone of laser cladding non-weldable nickel-based superalloy

Zhenlin Zhang, Yue Zhao, Jiguo Shan, Aiping Wu, Yutaka S. Sato, Shun Tokita, Kota Kadoi, Hiroshige Inoue, Huaipeng Gu, Xin Tang

研究成果: Article査読

5 被引用数 (Scopus)

抄録

Laser cladding with a paraxial powder-feeding device was used to repair as-cast K447A nickel-based superalloy, a kind of non-weldable alloy with a high Hf content and working as gas-turbine hot-section components. In the present study, the metallurgical evolution behavior of liquid film and liquation cracking mechanisms are studied. The results showed that a kind of uncommon Ni21Hf8 phase was found in the incipient melting regions (IMR) of the intergranular region. In the thermal cycle, γ/Ni21Hf8 eutectic liquefaction, M5B3 dissolved, and γ/γ’ eutectic liquefaction successively occurred in the heating process in IMR, and liquid → γ + γ/γ’ + M5B3 + γ/Ni21Hf8 → γ + γ’(3) + γ/γ’ + γ/Ni21Hf8 + M5B3 occurred in the cooling process. The inhomogeneity of the intergranular structure leads to the liquid film with the characteristics of discontinuous distribution and uneven width. The cracking criterion of the liquid film was established based on pressure drop. When the closed liquid film meets the condition of 2γsl<1/K*(ρsl−1*R*dt+∆hε), the liquid film with a thickness that is greater than critical thickness will be induced into a liquation cracking.

本文言語English
論文番号158463
ジャーナルJournal of Alloys and Compounds
863
DOI
出版ステータスPublished - 2021 5 15

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

フィンガープリント

「Evolution behavior of liquid film in the heat-affected zone of laser cladding non-weldable nickel-based superalloy」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル