1Cr12Ni3MoVN钢渗氮层的组织与性能
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摘要
研究了调质态1Cr12Ni3MoVN钢在580℃、氨分解率30%～70%条件下,气体渗氮4、8、16和32 h渗氮层的组织结构和性能。利用OM、SEM、EDS和XRD对渗氮层的显微组织、表面相结构、磨痕形貌等进行表征,并对渗氮层的显微硬度及摩擦磨损性能进行测试。结果表明,渗氮层组织致密均匀,包括化合物层、中间扩散层和过渡层,表层主要由ε-Fe_(2-3)N相和γ'-Fe_4N相组成,并含有少量CrN化合物;随渗氮时间延长,渗氮层厚度近似呈抛物线规律增加,但表面硬度降低。经渗氮后钢的耐磨性大幅度提高,表面仅呈现轻度磨损。
The microstructure and mechanical properties of surface layer of the quenched and tempered 1Cr12Ni3MoVN steel gas nitrided at 580 ℃ for 4-32 h under ammonia dissociation rate of 30%-70% were investigated. The microstructure,phase structure,worn surface morphology,microhardness profiles and wear resistance of the nitrided layer were revealed by using of OM, SEM, EDS, XRD,microhardness tester,friction and wear tester. The results show that the nitrided layer is compact and uniform,including compound layer,intermediate diffusion layer and transition layer. And the compound layer is composed mainly of ε-Fe_(2-3)N,γ'-Fe_4N and a few CrN. With prolonging nitriding time,the nitrided layer thickness increases according approximately to parabolic law,but the surface hardness decreases.After nitriding,the wear resistance of the steel is greatly improved,and the surface is only slightly worn.
The microstructure and mechanical properties of surface layer of the quenched and tempered 1Cr12Ni3MoVN steel gas nitrided at 580 ℃ for 4-32 h under ammonia dissociation rate of 30%-70% were investigated. The microstructure,phase structure,worn surface morphology,microhardness profiles and wear resistance of the nitrided layer were revealed by using of OM, SEM, EDS, XRD,microhardness tester,friction and wear tester. The results show that the nitrided layer is compact and uniform,including compound layer,intermediate diffusion layer and transition layer. And the compound layer is composed mainly of ε-Fe_(2-3)N,γ'-Fe_4N and a few CrN. With prolonging nitriding time,the nitrided layer thickness increases according approximately to parabolic law,but the surface hardness decreases.After nitriding,the wear resistance of the steel is greatly improved,and the surface is only slightly worn.
引文
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[3]Kouba R,Keddam M,Djeghlal M E.A diffusion-precipitation model for gaseous nitriding of Fe-2wt.%V alloy[J].Journal of Alloys and Compounds,2012,536:124-131.
[4]Mouri L,Mabille I,Fiaud C,et al.Study of corrosion resistance and surface properties of carbon steel after a duplex plasma treatment[J].Thin Solid Films,2001,389:153-160.
[5]房双强,陈茂涛,曲江江,等.渗氮技术与渗氮钢应用综述[J].材料导报,2014,28(23):392-395.Fang Shuangqiang,Chen Maotao,Qu Jiangjang,et al.The current application situation of niriding technology and nitriding steel[J].Materials Review,2014,28(23):392-395.
[6]Cleugh D,Blawert C,Steinbach J,et al.Effects of rare earth additions on nitriding of EN40B by plasma immersion ion implantation[J].Surface and Coatings Technology,2001,142-144:392-396.
[7]Rolinski E,Sharp G.The effect of sputtering on kinetics of compound zone formation in the plasma nitriding of 3%Cr-Mo-V steel[J].Journal of Materials Engineering and Performance,2001,10(4):444-448.
[8]Poulachon G,Moisan A,Jawahir I S.Tool-wear mechanisms in hard turning with polycrystalline cubic boron nitride tools[J].Wear,2001,250:576-586.
[9]Bader M,Spies H J,H9ck K,et al.Properties of duplex treated(gasnitriding and PVD-TiN,-Cr2N)low alloy steel[J].Surface and Coatings Technology,1998,98:891-896.
[10]Wu D,Kahn H,Dalton J C,et al.Orientation dependence of nitrogen supersaturation in austenitic stainless steel during low-temperature gasphase nitriding[J].Acta Materialia,2014,79:339-350.
[11]田金莉.氮化层的分类和评定[J].国外化学热处理,1981(2):12-17.
[12]Yang J,Liu Y,Ye Z,et al.Microstructural and tribological characterization of plasma-and gas-nitrided 2Cr13 steel in vacuum[J].Materials and Design,2010,32(2):808-814.
[13]Bottoli F,Jellesen M S,Thomas L,et al.High temperature solutionnitriding and low-temperature nitriding of AISI 316:Effect on pitting potential and crevice corrosion performance[J].Applied Surface Science,2018,431:24-31.
[14]Boztepe E,Alves A C,Ariza E,et al.A comparative investigation of the corrosion and tribocorrosion behaviour of nitrocarburized,gas nitrided,luidized-bed nitrided,and plasma nitrided plastic mould steel[J].Surface and Coatings Technology,2018,334:116-123.
[15]张程菘.铁基合金等离子体稀土氮碳共渗组织超细化与深层扩散机制[D].哈尔滨:哈尔滨工业大学,2015.
[16]刘瑞良,闫牧夫,赵成志,等.17-4PH钢等离子体稀土氮碳共渗层的组织结构和性能[J].金属热处理,2008,33(8):21-24.Liu Riuliang,Yan Mufu,Zhao Chengzhi,et al.Microstructure and mechanical properties of plasma RE nitrocarburized layer of 17-4PHsteel[J].Heat Treatment of Metals,2008,33(8):21-24.
[17]王祎雪.中碳低合金钢渗氮与激光淬火复合改性层组织与性能[D].哈尔滨:哈尔滨工业大学,2015.
[18]Niewa R,Rau D,Wosylus A,et al.High-pressure,high-temperature single-crystal growth,Ab initio electronic structure calculations,and equation of state ofε-Fe3N1+x[J].American Chemical Society,2009,21:392-398.
[19]Tetsuyatakahashi,Burghaus J,Music D,et al.Elastic properties ofγ'-Fe4N probed by nanoindentation and ab initio calculation[J].Acta Materialia,2012,60(5):2054-2060.