Summary of the project

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Summary of the project Anisotropy of mechanical
properties of cold rolled 301 Austenitic
Stainless Steel
Principal Investigators
Graduate Research Assistant Dr Joseph Benedyk

Chirayu Garud Dr Philip Nash Dr Sheldon
Mostovoy
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• Nature of problem
• Gaskets stamped and embossed out of sheets
• Mis-registry in the sheared section and the
  surrounding hub
• The material 301 Austenitic Stainless Steel

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Composition of 301 Austenitic Stainless Steel
(As Quoted in ASM Stainless Steel Specialty
Handbook)
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• Metastable Austenite transforms to strain
  induced Martensite
• Strain induced transformation imparts strength
  to the material
• Strain induced Martensite is magnetic in nature
• The Bauschinger Effect

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Yield Strength is higher in tension than in
Compression
(Figure obtained from Allegheny Ludlum Technical
blue data sheet)
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Variation in Magnetic permeability with the
amount of cold work
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Hardness Profiles

• Measurement of micro-hardness starting on the
  tension side going up to the compression side
• Observe variation in micro-hardness as a
  function of distance from the tension edge

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Representative Samples
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Good Material in Rolling Direction
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Good Material Against Rolling Direction
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No Good Material in Direction of Rolling
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No Good Against Rolling Direction
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Ongoing Research

• Conduct hardness profile measurements on samples
  which are bent and then heat treated
• Correlate the hardness profiles with the
  Bauschinger effect
• Corelate the hardness values to the tensile test
  values
• Calculate the amount of SIM by X-Ray diffraction
• Calculate the R value for the material
• Utilize the data on Bauschinger effect for
  Spring back analysis

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Any Questions ?