25Cr5MoA渗氮钢的高温力学性能  

High temperature mechanical properties of 25Cr5MoA nitriding steel

作　　者：臧悦[1,2] 任学平[1] 赵艳君[1,3] 李殊霞[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]中钢设备有限公司,北京100080 [3]广西大学材料科学与工程学院,广西南宁530004

出　　处：《金属热处理》2012年第8期30-33,共4页Heat Treatment of Metals

基　　金：广西大学科研基金(XBZ110407)

摘　　要：为使25Cr5MoA钢适用于齿轮、轴承、柱塞套等零件的渗氮,防止其在服役过程中出现偶然过热,研究了该钢的高温力学性能和高温下奥氏体组织。结果表明,25Cr5MoA钢的奥氏体化温度为910～950℃;25Cr5MoA钢的工作温度在室温～600℃之间时,其抗拉强度(Rm)在757～650 MPa之间,200℃时25Cr5MoA钢的抗拉强度达到最大值1032 MPa,说明该钢在600℃以下有较好的红硬性,但在200～400℃时,伸长率只有4.72%,因此要避免在200～400℃内受到冲击或形变。25CrSMoA steel is a new type of nitriding steel, which is fit for the parts such as gears, bearings and plunger sleeves. To prevent from occasional overheating for these parts, the high temperature mechanical properties and austenite microstructure of 25 Cr5 MoA steel were investigated. The results show that an appropriate austenitizing temperature of 25CrSMoA steel is 910-950℃. The 25CrSMoA steel used below 600℃ has high tensile strength with 757-650 MPa; when used in 200℃, it has the maximum tensile strength with 1032 MPa; however used in 200-400℃ , it has the lowest elongation with only 4.72%. The impact load and deformation should be avoided for 25CrSMoA steel used in 200-400℃.

关 键 词：25Cr5MoA钢 高温力学性能 奥氏体化温度 

分 类 号：TG142.7[一般工业技术—材料科学与工程]