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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50743

Title: Effects of Grain Boundary Microconstituents on Heat-Affected Zone Cracks in a Mar-M004 Weldment
Authors: Tai-Cheng Chen
Yi-Hsin Cheng
Leu-Wen Tsay
Ren-Kae Shiue
Contributors: 國立臺灣海洋大學:材料工程研究所
Keywords: gas tungsten arc welding
liquation crack;MC carbide
intermetallic compound
boride
Mar-M004 superalloy
Date: 2018-01
Issue Date: 2018-10-22T08:05:51Z
Publisher: Metals
Abstract: Abstract: Repair-welding of a cast Mar-M004 superalloy by gas tungsten arc welding was performed. Liquation cracks of the heat-affected zone (HAZ) in a Mar-M004 weldment were closely related to the presence of low-melting constituents along the solidified boundaries in the weld. The metal carbides (MC), M3B2 and M5B3 borides, Ni7(Hf,Zr)2 intermetallic compounds, and γ-γ′colonies were found at the interdendritic boundaries. Fine boride precipitates mixed with intermetallic compounds in lamellar form were more likely to liquate during repair-welding. The melting of borides and intermetallic compounds in 1180 °C/4 h treated samples confirmed the poor weldability of the Mar-M004 superalloy due to enhanced liquation cracking. In addition to boride formation, fractographs of liquation cracks revealed strong segregation of B element in carbides and intermetallics, which might further lower the solidus temperature of the repair weld.
Relation: 18(4)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50743
Appears in Collections:[材料工程研究所] 期刊論文

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