The effect of boron on the refinement of microstructure in cast cobalt alloys

被引：15

作者：

Bermingham, Michael J. ^{[1
,2
]}

McDonald, Stuart D. ^{[1
,3
]}

StJohn, David H. ^{[1
,2
,3
]}

Dargusch, Matthew S. ^{[1
,2
,3
]}

机构：

[1] Univ Queensland, Def Mat Technol Ctr, Sch Mech & Min Engn, Brisbane, Qld 4072, Australia

[2] Univ Queensland, Ctr Adv Mat Proc & Mfg, Sch Mech & Min Engn, Brisbane, Qld 4072, Australia

[3] Univ Queensland, CAST Cooperat Res Ctr, Sch Mech & Min Engn, Brisbane, Qld 4072, Australia

来源：

JOURNAL OF MATERIALS RESEARCH | 2011年 / 26卷 / 07期

关键词：

CR-MO ALLOY; GRAIN-REFINEMENT; NANOCRYSTALLINE COBALT; MECHANICAL-PROPERTIES; EPSILON-MARTENSITE; ALUMINUM-ALLOYS; SIZE; SOLIDIFICATION; SUPERALLOY; INOCULATION;

D O I：

10.1557/jmr.2011.21

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Controlling the grain size and morphology of cast cobalt-based components is important for optimizing a component's in-service properties. This work investigates the role of boron on the grain size of binary cobalt-boron alloys by application of contemporary grain refinement theory. Boron solute is found to refine the width of the columnar grains but fails to promote the columnar to equiaxed transition. The lack of equiaxed grains is attributed to the thermal solidification conditions and a lack of potent nucleant particles. The refinement of the columnar grains with boron solute may be due to a growth restriction mechanism.

引用

页码：951 / 956

页数：6

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