Effect of strain rate on quasistatic tensile flow behaviour of solution annealed 304 austenitic stainless steel at room temperature |
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Authors: | Amrita Kundu Pravash Chandra Chakraborti |
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Affiliation: | (1) Metallurgical and Material Engineering Department, Jadavpur University, Kolkata, 700 032, India;(2) Present address: School of Metallurgy and Materials, University of Birmingham, Birmingham, B152TT, UK; |
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Abstract: | Room temperature tensile test results of solution annealed 304 stainless steel at strain rates ranging between 5 × 10−4 and 1 × 10−1 s−1 reveal that with increase in strain rate yield strength increases and tensile strength decreases, both maintaining power–law
relationships with strain rate. The decrease in tensile strength with increasing strain rate is attributed to the lesser amount
of deformation-induced martensite formation and greater role of thermal softening over work hardening at higher strain rates.
Tensile deformation of the steel is found to occur in three stages. The deformation transition strains are found to depend
on strain rate in such a manner that Stage-I deformation (planar slip) is favoured at lower strain rate. A continuously decreasing
linear function of strain rate sensitivity with true strain has been observed. Reasonably good estimation for the stress exponent
relating dislocation velocity and stress has been made. The linear plot of reciprocal of strain rate sensitivity with true
strain suggests that after some critical amount of deformation the increased dislocation density in austenite due to the formation
of some critical amount of deformation-induced martensite plays important role in carrying out the imposed strain rate. |
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