为提高高温抗氧化性能,对HP40Nb钢进行了热浸镀Al-10%(质量分数)Si,并进行不同温度扩散处理,研究了不同扩散处理试样在1000℃条件下的高温氧化行为,通过SEM,EDS和XRD分析了经不同扩散处理后的渗层在高温氧化过程中的组织结构变化.结果表明:经800℃/4h扩散处理,渗层由内层(NiAl+ Cr3 Si)、中间层(Fe2 Al5+少量Ni2 Al3)和外层( FeAl3)组成；经900℃/4h扩散处理,渗层由内层(NiAl+ Cr3 Si)和外层(Fe2 Al5+少量Ni2 Al3)组成；经1000℃/4h扩散处理渗层由内层(α+Ni3Al,NiAl+ Cr3 Si)和外层(Fe2 Al5+ Ni2 Al3)组成.不同扩散工艺处理试样经高温氧化360h后渗层均由外层(NiAl+ Cr3 Si)和内层(σ,α+Ni3Al)组成；经1000℃/4h扩散处理试样高温氧化性能最好,其氧化增重速率仅为未浸镀试样的13%.氧化过程中,渗层表面经扩散处理生成的α-Al2O3能显著提高钢的高温抗氧化性能.扩散温度越高,α-Al2O3越完整,致密抗高温氧化性能越好；渗层中σ相能阻碍铝原子的内扩散,从而保证了氧化过程中渗层表面生成α-Al2 O3所需铝含量,除表面的α-Al2 O3外,渗层中的NiAl,Cr3 Si相也起到了抗氧化作用.
参考文献
| [1] | 喇培清,曾丽,刘致远,王维国,阎峰云,郝远.Al对HP40合金显微组织的影响[J].铸造,2008(05):487-490. |
| [2] | 李处森,杨院生,吴欣强.HP耐热钢结焦、渗碳的原因分析[J].中国腐蚀与防护学报,2002(05):286-289. |
| [3] | 黄志荣.乙烯裂解结焦机理及结焦抑制技术进展[J].江苏石油化工学院学报,2000(02):36-39. |
| [4] | BRIL U;KLWER J .Corrosion behavior of high silicon alloys in carbon-bearing and high sulfur atomosphere[J].Materials at High Temperatures,1993,11(1-4):151-158. |
| [5] | KLWER J .High temperature corrosion behaviour of iron aluminides and iron-aluminium-chromium alloys[J].Materials and Corrosion,1996,47(1-4):685-694. |
| [6] | KANE R H .Effects of silicon and oxidation potential on the carburization of centrifugally cast HK-40[J].Corrosion,1981,37(04):187-199. |
| [7] | 刘连涛,孙勇.镀液合金元素对钢镀铝界面组织的影响[J].金属热处理,2009(02):25-29. |
| [8] | 韩石磊,李华玲,王树茂,蒋利军,刘晓鹏,李岩.不锈钢热浸镀铝中温度及合金元素对膜厚的影响[J].表面技术,2009(04):20-22,38. |
| [9] | Sung-Ha Hwang;Jin-Hwa Song;Yong-Suk Kim .Effects of carbon content of carbon steel on its dissolution into a molten aluminum alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2005(1/2):437-443. |
| [10] | Kuo-Liang Wang;Fan-Shiong Chen;Goa-Shee Leu .The aluminizing and Al-Si codeposition on AISI HP alloy and the evaluation of their carburizing resistance[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):27-38. |
| [11] | 黄志荣,孙启凤,罗小秋.HP40钢表面A12O3薄膜制备及抑制结焦性能研究[J].材料工程,2008(02):18-22. |
| [12] | Shigeaki Kobayashi;Takao Yakou .Control of intermetallic compound layers at interface between steel and aluminum by diffusion-treatment[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(1/2):44-53. |
| [13] | J. An;Y. B. Liu;M. Z. Zhang .Effect of Si on the interfacial bonding strength of Al-Pb alloy strips and hot-dip aluminized steel sheets by hot rolling[J].Journal of Materials Processing Technology,2002(1/3):30-36. |
| [14] | Steinfechner K.;Wedemeyer O.;Konys J. .INVESTIGATIONS ON THE TRANSFORMATION BEHAVIOR OF THE INTERMETALLIC PHASE (FE, CR)(2)AL-2 FORMED ON MANET II STEEL BY ALUMINIZING[J].Journal of Nuclear Materials: Materials Aspects of Fission and Fusion,1997(1):33-38. |
| [15] | 李美栓.金属的高温腐蚀[M].北京:冶金工业出版社,2001 |
| [16] | SCHUMANN E;YANG J C;R(U)HLE M R et al.High-resolution SIMS and analytical TEM evaluation of alumina scales on β-NiAl containing Zr or Y[J].Oxidation of Metals,1996,46(1-2):37-49. |
| [17] | PRESCOTT R;MITCHELL D F;GRAHAM M J et al.Oxidation mechanisms of β-NiAl+Zr determined by SIMS[J].Corrosion Science,1995,37(09):1341-1364. |
| [18] | C. Stallybrass;G. Sauthoff .Ferritic Fe-Al-Ni-Cr alloys with coherent precipitates for high-temperature applications[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2004(0):985-990. |
| [19] | F. Lechermann;M. Fahnle;J.M. Sanchez .First-principles investigation of the Ni-Fe-Al system[J].Intermetallics,2005(10):1096-1109. |
| [20] | X. Q. Wu;H. M. Jing;Y. G. Zheng;Z. M. Yao;W. Ke;Z. Q. Hu .The eutectic carbides and creep rupture strength of 25Cr20Ni heat-resistant steel tubes centrifugally cast with different solidification conditions[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2000(1/2):252-260. |
| [21] | Wang CJ;Chen SM .Microstructure and cyclic oxidation behavior of hot dip aluminized coating on Ni-base superalloy Inconel 718[J].Surface & Coatings Technology,2006(7):3862-3866. |
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