Based on your recommendation, the company changed their material but selected a material, which was irrelevant to your suggestion due to cost. They begin to produce forging die made of D3 tool steel but it fractured after only a short service life. The cause of the failure was found to be severe carbon segregation. A client has asked for your recommendation for correction of this problem. In response to this request, please address the topics (a) to (c) first and then provide your recommendation.