日本金属学会誌

J. Japan Inst. Metals, Vol. 40, No. 1 (1976),
pp. 6-12

Relationship between Flow Stress and Hardness in Fe-Ni Alloys in a Low Temperature Range

Shizuo Mukai1 and Makoto Fujiwara2

1Department of Metallurgy, Kyushu Institute of Technology, Kitakyushu
2Department of Metallurgy, Kyushu Institute of Technology, Kitakyushu. Present address: Takada Industries, Ltd., Kitakyushu

Abstract:

In order to make clear the relationship between flow stress and hardness in Fe, Fe-2%Ni and Fe-3%Ni alloys with grain sizes of 13∼69 μ were studied using the tensile and Vickers hardness tests in a low temperature range. The results obtained are as follows:
(1) In linear HVf vs ε1/2 diagrams, the difference between HV and H0 ε, obtained by extrapolating ε to zero, is large and HV equals HVf at 1∼2% strain in Fe, but the difference is smaller in Fe-2%Ni and Fe-3%Ni than in Fe.
(2) Kf and KH, Hall-Petch parameters in flow stress and hardness are large in Fe and decrease with increase in Ni content. But those are independent of temperature.
(3)  σ 0f and H0V are small in Fe and increase with increase in Ni content and decrease in temperature.
(4) The following approximate equation is held with regard to the specimens used:


(Received 1975/02/19)

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