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Thermal stability of primary MC carbide and its influence on the performance of cast Ni-base superalloys
W.; Qin Sun, X. Z.; Guo, J. T.; Lou, L. H.; Zhou, L. Z.
2015
Source PublicationMaterials & Design
ISSN0261-3069
Volume69Pages:81-88
AbstractInvestigations into the thermal stability of primary MC carbide (TSMC) during long-term thermal exposure and its effects on the performance of nine cast Ni-based superalloys with different Nb/Ti and (W + Mo)/Cr ratios have been undertaken. The results show that the chemical composition of primary MC can be precisely modified by the Nb/Ti ratio of alloys while the distribution and morphology of primary MC carbides is not affected. During long-term thermal exposure, the TSMC is dependent not only on the composition of primary MC, i.e. the Nb/Ti and (Nb + Ti)/(W + Mo) ratios of primary MC, but also on the (W + Mo)/Cr ratios of the alloys, and the latter has a more significant effect than the formers. With the decrease of these parameters, the TSMC decreases and more degeneration reactions of primary MC occur during thermal exposure. Moreover, with the (W + Mo)/Cr ratio of the alloys decreasing from 0.55 to 0.37 and finally to 0.22, the transformed carbides from primary MC change from M6C to coexist of M6C and M23C6 and to M23C6. With the decrease of TSMC, the stress-rupture life of alloy at 800 degrees C/294 MPa is improved, because that more secondary carbides precipitate in the matrix which can retard or even suppress the topologically close-packed (TCP) phases. (C) 2014 Elsevier Ltd. All rights reserved.
description.department[sun, wen] univ sci & technol china, hefei 230022, peoples r china. [sun, wen ; qin, xuezhi ; guo, jianting ; lou, langhong ; zhou, lanzhang] chinese acad sci, inst met res, shenyang 110016, peoples r china. ; qin, xz (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china. ; xzqin@imr.ac.cn
KeywordCast Ni-base Superalloy Primary Mc Thermal Stability Topologically Close-packed Phase Performance Single-crystal Superalloy Mechanical-properties K465 Superalloy Sx-superalloys Mu Phase Evolution Behavior Microstructures Decomposition Exposure
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/73926
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
W.,Qin Sun, X. Z.,Guo, J. T.,et al. Thermal stability of primary MC carbide and its influence on the performance of cast Ni-base superalloys[J]. Materials & Design,2015,69:81-88.
APA W.,Qin Sun, X. Z.,Guo, J. T.,Lou, L. H.,&Zhou, L. Z..(2015).Thermal stability of primary MC carbide and its influence on the performance of cast Ni-base superalloys.Materials & Design,69,81-88.
MLA W.,et al."Thermal stability of primary MC carbide and its influence on the performance of cast Ni-base superalloys".Materials & Design 69(2015):81-88.
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