35#正火热处理工艺曲线图
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Unit 5 Integrated skills World Wide Fund for Nature It can protect the wildlife, nature and environment 。 It can help poor families and children. ORBIS It works to help people who are unable to see. It can make our world e fair. UNICEF It works to
汽车变速箱齿轮用20CrMnTi制造,其加工工艺路线为:锻—正火—机加工—渗碳、淬火及低温回火—喷丸—精磨,热处理工艺曲线如下图所示。请回答以下问题:温度920℃-970C920℃预冷870℃-880℃气体渗碳空冷油冷200℃正火(1分)渗碳、淬火(2分)低温回火(1分)时间(1)说明各热处理工序的作用。正火:抑制或消除网状渗碳体;...