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12CrNi3A,12Cr2Ni4A,18CrNiWA,系渗碳合金钢,属于珠光体+马氏体及马氏体类型。经渗碳后在空冷条件下已获得马氏体+残余奥氏体马氏体+屈氏体,屈氏体+索氏体+少量铁素体。这种材料渗碳层的测定,不宜采用低碳结构钢和珠光体类型的渗碳合金钢渗碳层的测定方法,低碳结构钢和珠光体类型的渗碳合金钢,渗碳后在空冷的条件下不能获得马氏体组织,渗碳后的层深可采用测至过共析+共析+过渡区(即亚共析)的二分之一或测至中心组织的三分之
12CrNi3A, 12Cr2Ni4A, 18CrNiWA, Department carburizing alloy steel, belongs to the type of pearlite + martensite and martensite. After carburizing in air-cooled conditions have been obtained martensite + retained austenite martensite + troostite, troostite + sorbite + a small amount of ferrite. This material carburizing layer determination, not suitable for low carbon structural steel and pearlite type carburizing alloy steel carburizing layer determination method, low-carbon structural steel and pearlite type carburizing alloy steel, after carburizing in air-cooled Can not be obtained under the conditions of martensite, after carburizing layer depth can be measured to the eutectoid + eutectoid + transition zone (ie, sub-eutectoid) half or measured to the center of the third