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一块碳质量分数wC=0.1%的碳钢在930℃渗碳,在距表面0.05cm处碳含量达到wC=0.45%。在t>0的全部时间,渗碳气氛保持表面成分为wC=1%,假设DCγ=2.0×10-5exp(一140000/RT),求: ①渗碳时间; ②若将渗层加深一倍需要多长时间; ③若规定wC=0.3%作为渗碳层厚度的度量,那么在930℃渗碳10h的渗层厚度为870℃渗碳10h的多少倍?
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