Crystallographic study on microstructure and martensitic transformation of NiMnSb meta-magnetic
Phase Transformation and Microstructure - The Jominy …dhitt/me124/JominyNotes.pdf · Phase...
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Transcript of Phase Transformation and Microstructure - The Jominy …dhitt/me124/JominyNotes.pdf · Phase...
![Page 1: Phase Transformation and Microstructure - The Jominy …dhitt/me124/JominyNotes.pdf · Phase Transformation and Microstructure - The Jominy Bar. ... Continuous Cooling Diagrams and](https://reader031.fdocuments.in/reader031/viewer/2022030400/5a730f067f8b9ab1538e2f24/html5/thumbnails/1.jpg)
Phase Transformation and Phase Transformation and Microstructure Microstructure -- The Jominy BarThe Jominy Bar
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Isothermal Transformation Diagram (Fe-Fe3C)
![Page 3: Phase Transformation and Microstructure - The Jominy …dhitt/me124/JominyNotes.pdf · Phase Transformation and Microstructure - The Jominy Bar. ... Continuous Cooling Diagrams and](https://reader031.fdocuments.in/reader031/viewer/2022030400/5a730f067f8b9ab1538e2f24/html5/thumbnails/3.jpg)
Complete Isothermal Transformation Diagram for Eutectoid Composition
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“Slow Cooling” - Pearlite
coarse fine
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“Fast Cooling” – Bainite and Martensite*
Bainite Martensite
*photos under electron microscopy
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Complete Isothermal Transformation Diagram for 4340 Steel Alloy
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Continuous Cooling vs. Isothermal Diagrams
Effective shift in the start/stop times for the reaction
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Continuous Cooling Diagrams and Microstructure (Eutectoid Steel)
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Continuous Cooling Diagrams and Microstructure –4340 Steel Alloy
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Hardness vs. Microstructure & Carbon Content
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TTT Diagram and Hardenability
1095
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TTT Diagram and Hardenability
4140
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TTT Diagram and Hardenability
4340
![Page 14: Phase Transformation and Microstructure - The Jominy …dhitt/me124/JominyNotes.pdf · Phase Transformation and Microstructure - The Jominy Bar. ... Continuous Cooling Diagrams and](https://reader031.fdocuments.in/reader031/viewer/2022030400/5a730f067f8b9ab1538e2f24/html5/thumbnails/14.jpg)
The ASTM Jominy Bar Test
• ASTM Standard A255
• Standard measure for hardenability of steel
• 25.4mm Diameter,100mm Long Test Specimen
• Specimen heated above austenitic temperature (~800°C) for > 1 hour
• Specimen end quenced with water jet
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Estimated Cooling Rates within Jominy Bar
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Experimental Results – Plumpton & Harris (2002)
Microstructure
Quenched End
~800x
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Experimental Results - Plumpton & Harris (2002)
Microstructure
3/4L from Quenched
End
~800x
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Experimental Results - Plumpton & Harris (2002)
Hardness Curves