Surface microstructure modification of hypereutectic Nb-Si based alloys to improve oxidation resistance without damaging fracture toughness

被引：22

作者：

Guo, Yueling ^{[1
,2
]}

Li, Zhiming ^{[3
,4
]}

He, Junyang ^{[3
]}

Su, Haijun ^{[1
]}

Jia, Lina ^{[2
]}

Zhang, Jun ^{[1
]}

Liu, Lin ^{[1
]}

Zhang, Hu ^{[2
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

[2] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

[3] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany

[4] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China

来源：

MATERIALS CHARACTERIZATION | 2020年 / 159卷

基金：

中国国家自然科学基金;

关键词：

Nb-Si alloy; Electron beam surface melting; Rapid solidification; Oxidation; Fracture toughness; MECHANICAL-PROPERTIES; TEMPERATURE; TI; PHASE; BEHAVIOR; TRANSITION; CR;

D O I：

10.1016/j.matchar.2019.110051

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

To achieve a good balance between oxidation resistance and fracture toughness of hypereutectic Nb-Si based alloys, we tune the alloy surface microstructure by an approach of rapid surface remelting. The remelted layer with a refined and modified hypereutectic microstructure is created on a bulk cast Nb-20Si-24Ti-2Cr-2Al (at.%) alloy via electron beam surface melting (EBSM). The EBSM-remelted layer markedly improves the oxidation resistance of the experimental alloy, showing a decreased parabolic rate constant and a reduced weight gain upon oxidation at 1250 degrees C. Three-point bending tests show that fracture toughness of the EBSM-treated alloy is comparable to that of the cast alloy without EBSM treatment. This work thus demonstrates the capability of surface microstructure modification enabled by rapid remelting for improving the oxidation resistance of Nb-Si based alloys while maintaining the fracture toughness.

引用

页数：8

共 34 条

[1]

A. International, 2012, STAND TEST METH LIN

[2] The Origin of Microstructural Diversity, Texture, and Mechanical Properties in Electron Beam Melted Ti-6Al-4V [J].

Al-Bermani, S. S. ;

Blackmore, M. L. ;

Zhang, W. ;

Todd, I. .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2010, 41A (13) :3422-3434

[3] Ultrahigh-temperature Nb-silicide-based composites [J].

Bewlay, BP ;

Jackson, MR ;

Zhao, JC ;

Subramanian, PR ;

Mendiratta, MG ;

Lewandowski, JJ .

MRS BULLETIN, 2003, 28 (09) :646-653

[4] A review of very-high-temperature Nb-silicide-based composites [J].

Bewlay, BP ;

Jackson, MR ;

Zhao, JC ;

Subramanian, PR .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2003, 34A (10) :2043-2052

[5] Cyclic oxidation response of multiphase niobium-based alloys [J].

Chan, KS .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2004, 35A (02) :589-597

[6] Alloying effects on fracture mechanisms in Nb-based intermetallic in-situ composites [J].

Chan, KS .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2002, 329 :513-522

[7] Thermodynamic assessment of the Nb-Si-Mo system [J].

Geng, Tai ;

Li, Changrong ;

Zhao, Xinqing ;

Xu, Huibin ;

Du, Zhenmin ;

Guo, Cuiping .

CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY, 2010, 34 (03) :363-376

[8] OXIDATION OF MULTICOMPONENT 2-PHASE ALLOYS [J].

GESMUNDO, F ;

GLEESON, B .

OXIDATION OF METALS, 1995, 44 (1-2) :211-237

[9] Microstructure of Nb-Ti-Cr-Si based ultrahigh temperature alloy processed by integrally directional solidification [J].

Guo, B. H. ;

Guo, X. P. .

MATERIALS SCIENCE AND TECHNOLOGY, 2015, 31 (02) :231-236

[10] Improvement in the oxidation resistance of Nb-Si based alloy by selective laser melting [J].

Guo, Yueling ;

Jia, Lina ;

Kong, Bin ;

Zhang, Fengxiang ;

Liu, Jinhui ;

Zhang, Hu .

CORROSION SCIENCE, 2017, 127 :260-269

← 1 2 3 4 →