. Transactions. MQlltohllzSdIran. Mcllt „k,,x ;//,,r<ii rieC. V 04^9 °F) \ II \\ no ioo zso so Km ISO ioo 25-0 o .so loo iSq Tlmt. i-crJ/iacimtn to ^ R.,, IQ°C. (ie.^,. So loo ISO iao iSo Fig. 6.—Critical-point curves. Pt-PtRh thermocouple, in series with a high-resistance galvanometer,was inserted. An electric-resistance muffle furnace was used in theseand in all laboratory annealing treatments described here. Inverse-rateheating and cooHng curves are shown in Fig. 6, and the critical pointsAc, and Ar-i taken as the temperatures corresponding to the beginning 470 MALLEABLEIZING OF WH
. Transactions. MQlltohllzSdIran. Mcllt „k,,x ;//,,r<ii rieC. V 04^9 °F) \ II \\ no ioo zso so Km ISO ioo 25-0 o .so loo iSq Tlmt. i-crJ/iacimtn to ^ R.,, IQ°C. (ie.^,. So loo ISO iao iSo Fig. 6.—Critical-point curves. Pt-PtRh thermocouple, in series with a high-resistance galvanometer,was inserted. An electric-resistance muffle furnace was used in theseand in all laboratory annealing treatments described here. Inverse-rateheating and cooHng curves are shown in Fig. 6, and the critical pointsAc, and Ar-i taken as the temperatures corresponding to the beginning 470 MALLEABLEIZING OF WHITE CAST IRON of the break in each curve, reading from bottom to top in the case ofheating and from top to bottom in the case of coohng. There is some difference of opinion as to the proper interpretation ofcritical-point data from inverse-rate curves. Some writers beheve thatthe peak of the break should be taken as the true value for the point,others argue that the beginning of the break should be taken. We areinclined to agree with Howe that the first inflection in the curve, that isthe beginning of the transformation, should be regarded as the signifi-cant temperatu
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