A heated piece of steel, with a uniform initial carbon concentration of 0.20% by mass, was exposed to a carburizing atmosphere for an hour. Throughout the entire process, the carbon concentration on the surface was 0.70%. If the mass diffusivity of carbon in steel in this process was uniform at 1 × 10–11 m2/s, determine the percentage of mass concentration of carbon at 0.2 mm and 0.4 mm below the surface after the process. Answers: 0.428 percent, 0.268 percent
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