Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (11): 1415-1420.DOI: 10.1007/s40195-019-00891-6

Special Issue: 2018-2019高温合金专辑

• Orginal Article • Previous Articles     Next Articles

Single Crystal Castability and Undercoolability of PWA1483 Superalloy

De-Xin Ma1,2, Fu Wang3(), Jian-Zheng Guo1,2, Wen-Liang Xu3   

  1. 1 Wedge Central South Research Institute, Shenzhen 518045,China
    2 State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China
    3 State Key Laboratory for Manufacturing System Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China;
  • Received:2018-10-28 Revised:2018-11-29 Online:2019-11-10 Published:2019-11-10

Abstract:

Both of the single crystal (SX) castability and undercoolability of PWA1383 superalloy were investigated during the directional solidification and isothermal cooling. In all the six SX parts of a casting cluster, no stray grains were found, revealing a defect-free SX structure. This excellent SX castability of the superalloy was attributed to its good undercoolability. The melting point (TL) and the critical nucleation temperature (TN) of the alloy were measured to be 1327 °C and 1306 °C, respectively. The statistic average of the critical nucleation undercooling ΔTN?=?TL?-?TN of the alloy was determined to be about 21 K, exhibiting a relatively great capacity to be deeply cooled to a temperature below the melting point without the onset of solidification.

Key words: Superalloys, Crystal growth, Phase transitions