. Canadian foundryman (1918). FIG. 8—AFTER CURVE 23 ; COOLING VELO-CITY 12 8 SEC: HARDNESS 503. AFTER CURVE 25: COOLING VELOCITY 35 SEC: HARDNESS 664. November, 1918 CANADIAN FOUNDRYMAN 283 not a reversible reaction as regards con-stancy of temperature. Some idea of the effect of nickel uponthe tensile strength of iron will be ob-tained from a glance at Fig. 3. that such facts can be advantageouslyutilized for certain special with a steel containing 7 percent, of nickel and per cent, of car-bon, it is possible by simply carburizing. 1« 14 1Z io a 6 Cooling H
. Canadian foundryman (1918). FIG. 8—AFTER CURVE 23 ; COOLING VELO-CITY 12 8 SEC: HARDNESS 503. AFTER CURVE 25: COOLING VELOCITY 35 SEC: HARDNESS 664. November, 1918 CANADIAN FOUNDRYMAN 283 not a reversible reaction as regards con-stancy of temperature. Some idea of the effect of nickel uponthe tensile strength of iron will be ob-tained from a glance at Fig. 3. that such facts can be advantageouslyutilized for certain special with a steel containing 7 percent, of nickel and per cent, of car-bon, it is possible by simply carburizing. 1« 14 1Z io a 6 Cooling Hates in- Minutes FIG. 10—EFFECT OF INITIAL TEMPER ATURE ON CRITICAL COOLING VELO-CITIES AND HARDNESS. In this diagram the lower curve repre-sents the tensile strengths of slowly-cool-ed specimens, whilst the upper one cor-responds with the quenched the introduction and increase ofcarbon up to per cent, to the nickel-iron alloys, the effect is more rapidlyto raise the tensile strength, in otherwords, the carbon acts in the same di-rection as an increased percentage ofnickel. Thus, for example, with no car-bon the maximum ultimate stress is ob-tained with 15 per cent, of nickel, whilstwith per cent, of carbon practicallythe same properties are produced withonly 7 per cent, of nickel. One interest-ing result of th;s has haen indicated b?Dr. Guillet, as follows: From the diagram Fig. 3 it will beobserved that a slowly-cooled steel witfc7 per cent, of nickel and less than cent, of carbon has a tensile strengthof 35 tons to 38 tons
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