Effect of the cooling rate on microstructure and hardness of MAR-M247 Ni-based superalloy

被引：70

作者：

Milenkovic, Srdjan ^{[1
]}

Sabirov, Ilchat ^{[1
]}

LLorca, Javier ^{[1
,2
,3
]}

机构：

[1] IMDEA Mat Inst, Madrid 28040, Spain

[2] Univ Politecn Madrid, Dept Mat Sci, Madrid 28040, Spain

[3] CISDEM UPM CSIC, ETS Ingn Caminos, Madrid 28040, Spain

来源：

MATERIALS LETTERS | 2012年 / 73卷

关键词：

Solidification; Cooling rate; Microstructure; Ni-based superalloy; DIRECTIONALLY SOLIDIFIED MAR-M247; SEMISOLID DEFORMATION; MORPHOLOGY; VARIABLES; RENE-108;

D O I：

10.1016/j.matlet.2012.01.028

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of cooling rate on the microstructure of MAR-M247 Ni-based superalloy was investigated via physical simulation of the casting process. Solidification experiments with cooling rates in the range of 025-10 K/s showed smooth temperature profiles with measured cooling rates matching the set values. The MAR-M247 showed cellular (0.25 K/s) and dendritic (1, 5 and 10 K/s) microstructures. Microconstituents also varied with cooling rates: gamma/gamma' matrix with carbides and gamma/gamma' eutectic at 025 K/s, gamma/gamma' matrix with carbides at 1 K/s. and gamma/gamma' matrix with carbides and gamma/MC eutectic at 5 and 10 K/s. Moreover, the secondary dendritic arm spacing decreased and the hardness increased with the increase in the cooling rates. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：216 / 219

页数：4

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