Segregation and diffusion characterisation in two-stage homogenisation of conventional superalloy
Source: Materials Science and Technology, Volume 27, Number 10, October 2011 , pp. 1551-1557(7)
Publisher: Maney Publishing
The segregation behaviour of Φ 406 mm IN718 ingot was investigated, and the experimental results indicated that Nb was the most segregated element. Two-stage homogenisation treatment was employed to relieve the extensive microsegregation in the as cast ingot. Historically, it was difficult to characterise the effects of the second stage homogenisation because of the uncertainty in locating the diffusion areas. To solve this problem, a 900°C/1 h treatment (‘Tag’ method) was conducted after homogenisation, which could form δ phase (Nb enriched) to trace the diffusion of Nb. The results revealed that the average composition of δ phase area, quantity of δ phase precipitates and sizes of δ phase precipitates change with the proceeding of homogenisation. Eventually, homogeneous distribution of elements could be achieved by means of two-stage homogenisation treatment (1140°C/60 h+1190°C/30 h).
Document Type: Original Article
Affiliations: 1: School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China 2: Baosteel Research Institute, Baoshan Iron and Steel Co., Ltd, Shanghai 201900, China
Publication date: October 2011
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