Effects of Different Substrates on Microstructures and Mechanical Properties of a Bulk Nanocrystalline Structure Pure Iron Prepared by Aluminothermic Reaction Casting

A simple method was developed to produce the nanocrystalline pure iron by aluminothermic reaction casting. The microstructure of the iron was investigated by optical microscope (OM), transmission electron microscope (TEM), electron probe micro-analyzer (EPMA), scanning electron microscope (SEM) and...

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Bibliographic Details
Published inJournal of iron and steel research, international Vol. 22; no. 4; pp. 324 - 329
Main Authors ZHEN, Xiao-juan, LA, Pei-qing, LI, Cui-ling, HU, Su-lei
Format Journal Article
LanguageEnglish
Published Singapore Elsevier Ltd 01.04.2015
Springer Singapore
Subjects
aluminothermic reaction casting
Applied and Technical Physics
Engineering
Machines
Manufacturing
Material
Materials Engineering
Materials Science
mechanical property
Metallic Materials
microstructure
nanocrystalline
Physical Chemistry
Processes
pure iron
substrate
力学性能
反应铸造
扫描电子显微镜
玻璃基板
纯铁
纳米晶结构
透射电子显微镜
铝热反应
nanocrystalline
aluminothermic reaction casting
mechanical property
microstructure
pure iron
substrate
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Summary:A simple method was developed to produce the nanocrystalline pure iron by aluminothermic reaction casting. The microstructure of the iron was investigated by optical microscope (OM), transmission electron microscope (TEM), electron probe micro-analyzer (EPMA), scanning electron microscope (SEM) and X-ray diffraction (XRD). The mechanical performances of nanocrystalline pure iron were tested. It is found that the pure iron consists of nanocrystalline ferrite. For different substrates of copper and glass, the average grain size of the ferrite was 38 and 35 nm, respectively, which is larger on copper substrate than that on glass. The hardness, compressive strength, tensile strength, and total elongation are 167 and 137 HB, 400 and 500 MPa, 243 and 185 MPa, 16% and 10% on copper substrate and glass substrate, respectively. The hardness, tensile strength and total elongation are all larger on copper substrate than those on glass substrate, while the compressive strength is lower. The large supercooling in the product solidification provides the condition for high nucleation rate and thus leads to nano-grained austenite and final nano-grained ferrite transformed from those small austenite grains.
Bibliography:nanocrystalline; aluminothermic reaction casting; pure iron; substrate; microstructure; mechanical property
11-3678/TF
A simple method was developed to produce the nanocrystalline pure iron by aluminothermic reaction cast- ing. The mierostructure of the iron was investigated by optical microseope （OM）, transmission electron microscope （TEM）, electron probe micro-analyzer （EPMA）, scanning electron microscope （SEM） and X-ray diffraction （XRD）. The mechanical performances of nanoerystalline pure iron were tested. It is found that the pure iron consists of nanoerystalline ferrite. For different substrates of eopper and glass, the average grain size of the ferrite was 38 and 35 nm, respectively, which is larger on copper substrate than that on glass. The hardness, compressive strength, tensile strength, and total elongation are 167 and 137 HB, 400 and 500 MPa, 243 and 185 MPa, 16% and 10% on copper substrate and glass suhstrate, respectively. The hardness, tensile strength and total elongation are all larger on copper substrate than those on glass substrate, while the eompressive strength is lower. The large supercooling in the product solidification provides the condition for high nucleation rate and thus leads to nano-grained austenite and final nano-grained ferrite transformed from those small austenite grains.
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(15)30007-8