Transactions of Materials and Heat Treatment. 2013, (S1) Core

Thermal shock behavior of the directional solidified Ni-based cladding layerChinese Full Text

HU Bin1,HU Fang-you1,GUAN Ren-guo2,HUANG Xu-ren1,LU Chang-liang1(1.Qingdao Branch of NAEI,Qingdao 266041,China;2.School of Materials and Metallurgy,Northeastern University,Shenyang 110004,China)

Abstract: This thesis expect to use the directionally solidified laser cladding method to repair directionally solidified turbine blades to research on the thermal shock performance at 1000 ℃.With this purpose,two optional cladding layer powders are compared.Thermal shock results show that the cladding layer powder 2 has better cold-hot shock resistance than that of powder 1;the failure of the cladding layer powder 1 appears after 366 times thermal shocks,the cladding layer almost separate from the substrate which cause the cladding layer loses efficacy;the failure of the cladding layer powder 2 appears after 404 times of the thermal shocks,the cladding layer is partly separated from the substrate with small cracks inside which most cracks parallel to the junction direction,and the cladding layer loses efficacy too.The failure is not only because of the cracks appearing in the metallurgical bonding zone,the cracks inside the cladding layer which mostly in transition areas also cause the efficacy losing.To improve the coating cold-hot shock resistant ability,it should reduce the coefficient differences of thermal expansion between the substrate and the cladding layer;meantime choose the appropriate process parameters to reduce the lateral stress among layers,ensuring the transitions among the multiple cladding layers will be fine.

Keywords：

directional solidification; thermal shock; laser cladding; coefficient of thermal expansion; thermal stress;

DOI：
10.13289/j.issn.1009-6264.2013.s1.029
Series：
Subject：
Classification Code：
TG174.44

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Thermal shock behavior of the directional solidified Ni-based cladding layerChinese Full Text

HU Bin1,HU Fang-you1,GUAN Ren-guo2,HUANG Xu-ren1,LU Chang-liang1(1.Qingdao Branch of NAEI,Qingdao 266041,China;2.School of Materials and Metallurgy,Northeastern University,Shenyang 110004,China)

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