回火工艺对ZG70Cr2MnNiSi铸钢组织和性能的影响  

Influences of tempering process on microstructure and properties of ZG70Cr2MnNiSi cast steel

作　　者：王星贺[1] 杨涤心[1,2] 谢敬佩[1] 王文焱[1] 王爱琴[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]河南省有色金属材料科学与加工技术重点实验室,河南洛阳471023

出　　处：《金属热处理》2013年第7期42-45,共4页Heat Treatment of Metals

基　　金：河南省国际科技合作项目(084300510006)

摘　　要：探讨了回火工艺对ZG70Cr2MnNiSi铸钢组织和性能的影响。结果表明,在550～610℃范围内回火,都可得到回火索氏体组织。随回火温度的提高,合金碳化物分布的弥散度增大,材料的断裂机制由解理断裂向准解理断裂转变,表明材料的韧性得到提高。试验钢590℃回火后的抗拉强度为1285.35 MPa,断面收缩率为4.68%,达到较好的强韧性配合,适用于中等冲击磨损的工况条件。Influences of tempering process on the microstructure and properties of ZG70Cr2MnNiSi steel were studied. The results show that, tempering at 550-610 ~C, tempered sorbite can be gained. With the rising of tempering temperature, dispersity of alloy carbide increases, the fracture mechanism of the steel changes from cleavage to quasi-cleavage fracture, it shows that, the material＇s toughness is improved. Under 590 ~C tempering condition, the steel＇s tensile strength reaches 1285. 35 MPa, and the reduction of area is 4. 68%, better combination of strength and toughness is achieved. And the steel can be applied to operating conditions of medium impact wear.

关 键 词：耐磨钢 回火工艺 强度 韧性 断口形貌 

分 类 号：TG142.72[一般工业技术—材料科学与工程]