日本金属学会誌

J. Japan Inst. Metals, Vol. 18, No. 11 (1954),
pp. 557-561

Brinell Hardness of Soft Metals

Taketo Yokoyama


Abstract:

Brinell hardnesses of soft metals i.e. tin, lead, their eutectics, babbitt metals, cadmium, zinc, and also aluminium, copper, brass, mild steel were measured by changing the amount of the load applied, the length of the time of maintaining the load, and also the temperatures of the specimens. A new relationship between the load p kg, the length of time t sec., and the diameter of the impression dmm, was determined as follows:

P=(A-B log t) {1+2.3026 (n0-2 ± m log t) log d}d2

where A, B, n0, and m are constants which are also functions of the temperatures of specimens. Researches on the phenomena of the flow of metal, (also creep, relaxation) work-hardening, spontaneous annealing and recrystallization were carried out and discussed.
A new discriminative equation for the spontaneous annealing or work-hardening was deduced.
Also, new constants in which ``n0'' shows the workability and ``s0'' shows the flow index which depends on the degree of the work-hardening and the flow of metals were determined. In the Brinell test, the effects of quenching, loading speeds, repeated loadings and the size of the ball used were examined.


(Received 1954/6/24)

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