热处理对高强度易切削沉淀硬化不锈钢2Cr16Ni3Mo2CuN力学性能的影响  

Effect of Heat Treatment on Mechanical Properties of High Strength Free-Cutting Precipitation Hardening Stainless Steel 2Cr16Ni3Mo2CuN

作　　者：李志[1] 高谦[1] 高登攀[1] 江志华[1] 姜洪胜 许广鹏 

机构地区：[1]北京航空材料研究院第三研究室,北京100095 [2]抚顺特殊钢集团有限责任公司,抚顺113001

出　　处：《特殊钢》2005年第6期23-25,共3页Special Steel

摘　　要：高强度易切削沉淀硬化不锈钢2Cr16Ni3Mo2CuN在退火状态下有优良的切削性能.研究了经过一级退火温度710～800 ℃和二级退火温度570～620 ℃处理后2Cr16Ni3Mo2CuN钢的布氏硬度(HB)值,以及1 050～1 085 ℃ 45 min油冷,-70 ℃ 2 h,150,170 ℃回火后的力学性能.试验结果表明,710～740 ℃ 5 h空冷+620 ℃ 5 h空冷处理后,2Cr16Ni3Mo2CuN钢HB值在321以下;1 050～1 085 ℃淬火,150～200 ℃回火处理后,该钢强度极限σb≥1 520 MPa,δ5≥12%,冲击功AKU≥40 J.2Cr16Ni3Mo2CuN钢具有明显的二次硬化特征,二次硬化峰温度范围为480～520 ℃.The high strength free-cutting precipitation hardening stainless steel 2Cr16Ni3Mo2CuN has excellem cutting property in annealing conditions. The Brinell hardiaess （HB） number of steel 2Cr16Ni3Mo2CuN treated by first annealing at temperature between 710℃ and 800℃ and second annealing at temperature between 570 ℃ and 620℃ and the mechani- cal properties of steel treated with 1050～1085℃ for 45 rain oil cooling, -70℃ for 2h and 150℃ or 170 ℃ tempering have been studied. The test results showed that HB number of steel 2Cr16Ni3Mo2CuN treated with 710～740℃ for 5h＋620℃ 5h was less than 321 and tensile strength σb of steel was ≥1520 MPa, δ5≥12% and impact energy AKU≥40J. The steel 2Cr16Ni3Mo2CuN showed obvious secondary hardening effect and the peak temperature range of this effect was between 480℃ and 520℃.

关 键 词：易切削 高强度 沉淀硬化不锈钢 热处理 力学性能 强度极限 退火温度 回火处理 二次硬化 切削性能 

分 类 号：TG161[金属学及工艺—热处理]