Abstract
Diffusioin welding method using boron coating layer on bonding surface of IN738LC with pack cementation has been studied.
In this report, effect of pack cementation temperature on formation of boron coated layer, melting temperatures and thickness of the layers were investigated.
The results were as follows: Uniform boron coated layers was obtained by pack cementating at above 873 K.
Thickness of boron coated layers increased with increase of pack cementation temperature.
Meltingtemperatureofboroncoatedlayerdecreasedwithincreaseofpackcementation temperature.
But when vacuum heat treatment for degassing was conducted to boron coated layer, melting temperature became constant regardless of pack cementation temperature.
