Cu含量对马氏体沉淀硬化不锈钢0Cr17Ni4Cu4Nb组织和性能的影响  

Effect of Cu Content on Structure and Properties of Maraging Stainless Steel 0Cr17Ni4Cu4Nb

作　　者：王剑星[1,2] 杨钢[3] 张忠模[1,2] 赵彦[1,2] 唐光明[1,2] 魏小明[1,2] 申超[1,2] 黄河[1,2] 

机构地区：[1]重庆材料研究院有限公司,重庆400707 [2]国家仪表功能材料工程技术研究中心,重庆400707 [3]钢铁研究总院特殊钢研究所,北京100081

出　　处：《特殊钢》2017年第3期66-69,共4页Special Steel

基　　金：国家科技支撑计划(2014BAE11B00);2015年工业转型升级强基工程项目(TC150B5C0120)

摘　　要：试验0Cr17Ni4Cu4Nb钢(/%:0.016~0.017C,0.31~0.35Si,0.79~0.85Mn,0.009~0.012P,0.008~0.010S,15.29~15.43Cr,4.10~4.15Ni,3.34~4.92Cu,0.25~0.27Nb)由25 kg真空感应炉冶炼,锻造成Φ18 mm棒材。通过力学性能测试和组织分析,试验研究了3.34%~4.92%Cu含量对0Cr17Ni4Cu4Nb钢相变点,1 040℃1 h油冷,460~610℃2 h空冷时效的力学性能和组织的影响。结果表明,钢中Cu含量增加,对该钢Ac_3无显著影响,Ac_1下降,M_s点上升,M_f点下降;钢中Cu含量高时,钢的强度、硬度较高,塑性略低;当Cu含量为中下限时,可满足技术条件力学性能的要求,即460~500℃时效后R_m≥1 315 MPa,R_(p0.2)≥1 175 MPa,A≥10%,Z≥40%。The tested steel 0Crl7Ni4Cu4Nb （/%： 0.016 -0.017C, 0.31 -0.35Si, 0.79 -0.85Mn, 0.009 - 0. 012P, 0. 008 -0. 010S, 15.29 - 15.43Cr, 4. 10 -4. 15Ni, 3.34 -4.92Cu, 0. 25 -0. 27Nb） is melted by a 25 kg vac- uum induction furnace and forged to -P18 mm bar. The 3.34% - 4. 92% Cu content on phase transformation point of steel 0Crl7Ni4Cu4Nb, mechanical properties and structure of steel oil-quenched at 1 040 ℃ for 1 h and oil-coiling aged at 460 - 610 ℃ for 2 h is tested and studied by mechanical properties measurement and structure analysis. Results show that with increasing Cu content in steel the effect of Cu content on Ac3 is not obvious but the Acl decreases in some extent, and the Ms point of steel moves up while the Mf point of steel comes down; with higher Cu content in steel the strength and hardness of steel is higher, but plasticity of steel is slightly lower; with control the Cu content in steel being minimum to middle of standard permissible variations, it is able to meet the mechanical properties requirement of specification, i.e. with aged at 460 -500 ℃ the steel Rm≥l 315 MPa, R0.2 ≥1 175 MPa, A≥10% and Z≥40%.

关 键 词：0Crl7Ni4Cu4Nb马氏体沉淀硬化不锈钢cu含量力学性能 富cu相 

分 类 号：TG142.71[一般工业技术—材料科学与工程]