Changes in the strain hardening behavior of an fe-c alloy during strain aging

Stephenson, E. T.; Oren, Eyal

doi:10.1007/bf02900282

Cited by 4 publications

(1 citation statement)

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“…Two different slopes are frequently found when tensile stress/strain data are plotted on log-log coordinates. Two n values are quoted for such materials (Stephenson and Oren 1970), although it is not easy to relate the transition in the log-log plot to any change in strain-hardening behaviour (Bergstrom and Aronsson 1972). Strain-hardening rates have also been determined from equation ( 4) by extrapolating the experimental stress/strain curve backwards into the Liider's strain region (Place and Lund 1972).…”

Section: Discussionmentioning

confidence: 99%

Limitations of the Hollomon strain-hardening equation

Bowen¹,

Partridge²

1974

J. Phys. D: Appl. Phys.

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Conventional strength and strain-hardening parameters have been derived for idealized true-stress/true-strain curves obeying the Hollomon equation σ=Kϵpn, where K and n have values typical of real metals. All stress parameters are proportional to the constant K. The true tensile strength is almost independent of n, but the stress at 0·2% plastic strain is strongly dependent on n. The strain-hardening rate dσ/dϵp is significantly affected by n only when ϵp<0·01; then dσ/dϵp increases with increasing n when n<0·2 and decreases with increasing n when n>0·2. The strain-hardening rate is not easily related to the parameters nσmax, nK or the 0·2% proof-stress/true-tensile-strength ratio. The magnitude of the strain hardening, given by Δσ = (σϵ2 - σϵ1), also has a maximum between n=0·1 and 0·3. With these results, assumptions and conclusions in the published literature are discussed and some are shown to be incorrect. It is concluded that for maximum strength and strain hardening in materials obeying the Hollomon equation, large values of K and n values between 0·1 and 0·3 are required.

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Section: Discussionmentioning

confidence: 99%