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Evaluation of Normalizing Heat Treatment to Develop Improved … · 2013-06-05 · Background...
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Evaluation of Normalizing Heat Treatment to Develop Improved Properties inHeavy Section Pearlitic Iron
A DIS Project Proposal
June 6, 2012
Rick GundlachElement Wixom
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Objectivej
Investigate the influence of super critical and g pintercritical heat treatments on the mechanical properties of heavy section ductile iron castings
(2 inches and greater)(2 inches and greater)
The combination of strength and ductility is so g ydifficult to achieve in the pearlitic grades cast in heavy sections
Focus on ASTM Grades 80‐55‐06 and 100‐70‐03
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Backgroundg
• Normalizing is commonly employed in heavier sections to• Normalizing is commonly employed in heavier sections to obtain 80‐55‐06 properties
• DIS Project 46 ‐‐Mechanical properties in 3‐inch Y‐blocks
Tensile elongations of 6% never obtained, when a i i i ld h f 55 k i h dminimum yield strength of 55 ksi was reached.
•Intercritical heat treatments were even more effective in raising mechanical properties
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Schematic Equilibrium Phase DiDiagram
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Schematic of Heat Treatment CycleSchematic of Heat Treatment Cycle1600 UCT
1200
1400
deg.
F LCT
800
1000
pera
ture
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Tem
p
2000 100 200 300 400
Ti i tTime, minutes
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Intercritical Normalizingi i l l i l1545 F Intercritical plus Air Cool
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Formation of Acicular Austeniteby Intercritical Heat‐Treatment
γ
FerriteFerrite γ
γ
Grain Boundary
Graphite
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Intercritical Normalizingi i l l i l1545 F Intercritical plus Air Cool
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METHODOLOGY
Numerous keel block legs from Project 46 are available, particularly those from the 3 inch Y blocks of the DOE study (Y blocks from 9 heats)
METHODOLOGY
from the 3‐inch Y‐blocks of the DOE study (Y‐blocks from 9 heats)
• Supercritical and intercritical heat treatments will be performed.
D t i th ti i t iti l t t‐ Determine the optimum intercritical temperature ‐ Hardness testing and metallography will be performed
• Heat treat Keel block legs according to parameters derived above and perform mechanical testing and metallography
• Fractographic inspection of the broken tensile specimens will be performed on selected test barson selected test bars.
• Heat treatments that successfully produced the minimum properties of Grade 80‐55‐06 will be defined.
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ScheduleSchedule
• Element Wixom has DOE test materials on hand DIS members are• Element Wixom has DOE test materials on hand. DIS members are encouraged to provide additional test bars.
• Within 6 weeks, the 3‐inch Y‐blocks and any additional materials received will be subjected to heat‐treatment experiments.
• Evaluate the properties of the heat‐treated materials and determine the optimum heat‐treatment parameters (requires 3 to 4 months)p p ( q )
• Conduct additional heat‐treatment experiments and perform final round of mechanical testing, metallography and fractography (requires 2 months)
P j i d b l d i 9 h• Project is expected to be completed in 9 months.
• Estimated charges total $20,000