Abstract
In this report, first, I discussed the various methods of case depth measurement by the diffusion theory and showed the experimental results thereby obtained.
a) The measurement by the slow cooled specimen after carburization favors the study of carburization mechanism and comparison of carburization technic. It consists of two methods, one is the reading of carbon difference from matrix carbon conc, the other is the reading of the decided carbon conc. They show definite differences. The reading method of the decided carbon concentration is best for comparison of the with reading of the, hardened case depth.
b) To do the measurement by the hardened (and tempered) specimen after carburization, speciemens of the same dimension should be used pant. This method ascertains its hardness distribution and structure of the used part.
c) We can apply 3 equations of carburization in the carburization of various carburizing steel, such as C steel Cr steel and Ni-Cr steel with 0.2%C and the dimensions of ordinary parts as,
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where e _??_, C=weight concentration, D=diffusion const. T=temp., t=time, S=area, p=density of steel, W=weight increase per unit time, W=weight increase. C1=const.
d) Chrom steel absorbs carbon sooner than garbon steel, but saturates sooner and at higher temperature its tendency becomes inferior to ordinary. temperature.
