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Acta Metall Sin  1981, Vol. 17 Issue (1): 1-114    DOI:
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GRAIN BOUNDARY EMBRITTLEMENT BY μ AND σ PHASES IN IRON-BASE SUPERALLOYS
Chen Guoliang; Xie Xishan; Ni Kequan; Xu Zhichao; Wang Di (Beijing Institute of Iron and Steel Technology); Zhang Ming (Shanghai Institute of Iron and Steel Research); and Ju Yuying (Shanghai No. 5 Steel Works)
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Chen Guoliang; Xie Xishan; Ni Kequan; Xu Zhichao; Wang Di (Beijing Institute of Iron and Steel Technology); Zhang Ming (Shanghai Institute of Iron and Steel Research); and Ju Yuying (Shanghai No. 5 Steel Works). GRAIN BOUNDARY EMBRITTLEMENT BY μ AND σ PHASES IN IRON-BASE SUPERALLOYS. Acta Metall Sin, 1981, 17(1): 1-114.

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Abstract  Grain boundary embrittlement by μ and σ phases was studied in 15Cr-25Ni and 15Cr-40Ni type iron-base superalloys. The embrittlement of iron-base superalloys can be sensitive to small amounts of μ and σ phases present at the grain boundaries, even when the weight fraction is between 0.01 and 1%. The degree of embrittlement was found to be directly proportional to the concentration coefficients of the μ and σ phases at the grain boundaries. The embrittlement effect results in intergranular fracture during impact testing. Fracture mechanisms caused by the μ and σ phases were quite different. This embrittlement effect was suppressed by reducing the grain size or by decreasing or removing the grain boundary embrittling μ and σ phases by controlling the chemical composition of the alloys.
Received:  18 January 1981     
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