Liquid Zn assisted embrittlement of advanced high strength steels with different microstructures

In the present study, liquid metal embrittlement (LME) phenomenon during high temperature deformation was investigated for 3 grades of Zn-coated high strength automotive steel sheets consisting of different phases. Hot tensile tests were conducted for each alloy to compare their LME sensitivities at...

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Bibliographic Details
Published in:Metals and materials international 2016, 22(2), , pp.187-195
Main Authors: Jung, Geunsu, Woo, In Soo, Suh, Dong Woo, Kim, Sung-Joon
Format: Article
Language:English
Subjects:
Alloy systems
Characterization and Evaluation of Materials
Chemistry and Materials Science
Cooling
Cracks
Embrittlement
Engineering Thermodynamics
Grain boundaries
Heat and Mass Transfer
Heat resistant alloys
Heat resistant steels
High strength alloys
High strength steels
High temperature
Iron
Liquid metal embrittlement
Machines
Magnetic Materials
Magnetism
Manufacturing
Materials Science
Mechanical properties
Metal sheets
Metallic Materials
Metallurgical constituents
Microscopy
Phases
Processes
Segregations
Sheet metal
Solid Mechanics
Steel
Steel constituents
Strain
Strain rate
Strain rate sensitivity
Stress-strain curves
Substrates
Tensile tests
재료공학
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Summary:In the present study, liquid metal embrittlement (LME) phenomenon during high temperature deformation was investigated for 3 grades of Zn-coated high strength automotive steel sheets consisting of different phases. Hot tensile tests were conducted for each alloy to compare their LME sensitivities at temperature ranges between 600 and 900 °C with different strain rates. The results suggest that Zn embrittles all the Fe-alloy system regardless of constituent phases of the steel. As hot tensile temperature and strain rate increase, LME sensitivity increases in every alloy. Furthermore, it is observed that the critical strain, which is experimentally thought to be 0.4% of strain at temperatures over 700 °C, is needed for LME to occur. It is observed via TEM work that Zn diffuses along grain boundaries of the substrate alloy when the specimen is strained at high temperatures. When the specimen is exposed to the strain more than 0.4% at over 700 °C, the segregation level of Zn at grain boundaries seems to become critical, leading to occurrence of LME cracks.
ISSN:1598-9623
2005-4149
DOI:10.1007/s12540-016-5579-7