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논문 기본 정보

자료유형
학술저널
저자정보
Feng Wang (Guizhou University of Traditional Chinese Medicine) Morteza Taheri (Islamic Azad University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.9
발행연도
2021.9
수록면
3,462 - 3,477 (16page)
DOI
10.1007/s12540-020-00779-6

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초록· 키워드

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The objective of this research is to investigate the effect of heat treatment and pre-heating and pre-cold temperatures on hotcracks and microstructure of GTD-111 superalloy laser weld joints. For this purpose, a Nd:YAG pulsed-laser with a maximumpower of 400 w was used. Numerical computation results through the Rosenthal equation showed that the length ofthe various welding regions including HAZ, PMZ and MZ increased with increasing pre-welding sample from ? 25 to 200°C, which was in agreement with the experimental results of the experiments. By reducing the sample temperature beforeto welding from 200 to ? 25 °C, the heating rate increased from 162,857 to 195,000 °C/s. The high heating rate in pre-coldconditions increased the cooling rate of the weld metal and thereby decreased the segregation of the alloying elements. Inthe cast condition, the, -eutectic, Cr?Mo boride and Ni?Zr intermetallic phases were responsible of liquation cracks inHAZ, which were all dissolved in austenitic matrix by heat treatment at 1230 °C. The results of HAZ microstructural studiesshowed that by increasing the liquid film Thickness (LFT) due to the liquation ofand MC phases, the susceptibilityto liquation crack was reduced due to increased stress-relief. However, as the LFT increases due to the liquation of the -,Cr?Mo phases, the susceptibility to crack liquation increases due to the decrease in stress-relief for crack formation. This isattributed to the high ΔT of the -, Cr?Mo phases and the low ΔT of theand MC phases.

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