ppm级S对第二代抗热腐蚀镍基单晶高温合金恒温氧化行为的影响
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摘要
采用不连续增重法研究了ppm级S对第二代抗热腐蚀镍基单晶高温合金1 000℃恒温氧化行为的影响,测量了不同ppm级S含量合金的氧化动力学曲线,借助扫描电子显微镜(SEM)观察了合金氧化层截面的微观组织,利用X射线衍射分析仪(XRD)和能谱仪(EDS)确定了相结构,并分析了S含量变化对合金氧化机理的影响。结果表明:两种合金1 000℃的氧化动力学曲线均近似遵从抛物线规律, 2 ppm合金的氧化增重明显小于10 ppm合金;随着S含量ppm级的增加和氧化时间的延长,合金的抗氧化性能恶化。S含量的增加虽未改变氧化物的相组成,但明显改变了氧化物的形貌及不同氧化层的厚度、致密度及连续性,促进了合金内部TiN的形成。
Effect of sulfur(S) addition on isothermal oxidation behaviors of a nickel-base single crystal superalloy at1 000 ℃ was investigated using discontinuous weight gain method, the oxidation kinetics curves of the 2 ppm and 10 ppm alloys were measured, microstructure at the cross-section of the oxide scale was observed using scanning electron microscope(SEM), and the phase structure was determined using X-ray diffractometer(XRD) and energy dispersive spectroscopy(EDS). The results showed that the oxidation kinetics curves of the alloys at 1 000 ℃ almost followed the parabolic law, oxidation weight gain of the 2 ppm alloy was significantly smaller than that of 10 ppm alloy, and the oxidation resistance of the alloy deteriorated with the increase of ppm level sulfur content and the prolongation of oxidation time. Due to the increase of S content, the morphology of oxide, and the thickness, density and continuity of different oxide layers were changed.Furthermore, the addition of more S could accelerate the formation of the inner TiN even though the phase constitute of the oxide was not changed.
Effect of sulfur(S) addition on isothermal oxidation behaviors of a nickel-base single crystal superalloy at1 000 ℃ was investigated using discontinuous weight gain method, the oxidation kinetics curves of the 2 ppm and 10 ppm alloys were measured, microstructure at the cross-section of the oxide scale was observed using scanning electron microscope(SEM), and the phase structure was determined using X-ray diffractometer(XRD) and energy dispersive spectroscopy(EDS). The results showed that the oxidation kinetics curves of the alloys at 1 000 ℃ almost followed the parabolic law, oxidation weight gain of the 2 ppm alloy was significantly smaller than that of 10 ppm alloy, and the oxidation resistance of the alloy deteriorated with the increase of ppm level sulfur content and the prolongation of oxidation time. Due to the increase of S content, the morphology of oxide, and the thickness, density and continuity of different oxide layers were changed.Furthermore, the addition of more S could accelerate the formation of the inner TiN even though the phase constitute of the oxide was not changed.
引文
[1]OKADA I,TORIGOE T,TAKAHASHI K,et al.Development of Ni base superalloy for industrial gas turbine[C]//Superalloys.2004:707-712.
[2]REED R C,TAO T,WARNKEN N.Alloys-by-design:application to nickel-based single crystal superalloys[J].Acta Materialia,2009,57(19):5898-5913.
[3]陈鸿钧.IN738LC镍基高温合金高温蠕变疲劳性能研究[J].材料工程,1998(4):21-27.
[4]YUN D W,SEO S M,JEONG H W,et al.The cyclic oxidation behaviour of Ni-based superalloy GTD-111 with sulphur impurities at1100℃[J].Corrosion Science,2015,90:392-401.
[5]SATO A,CHIU Y L,REED R C.Oxidation of nickel-based single-crystal superalloys for industrial gas turbine applications[J].Acta Materialia,2011,59(1):225-240.
[6]常剑秀,王栋,董加胜,等.铼对镍基单晶高温合金恒温氧化行为的影响[J].材料研究学报,2017,31(9):695-702.
[7]HUANG L,SUN X F,GUAN H R,et al.Oxidation Behavior of a Single-Crystal Ni-base Superalloy in Air at 900,1000 and 1100℃[J].Oxidation of Metals,2006,65(3):207-222.
[8]王莉,刘心刚,张健,等.第三代单晶高温合金DD33的高温氧化行为[J].钢铁研究学报,2011,23(S2):353-356.
[9]KVERNES I A,KOFSTAD P.The oxidation behavior of some Ni-Cr-Al alloys at high temperatures[J].Metallurgical Transactions,1972,3(6):1511-1519.
[10]PETERS K R,WHITTLE D P,STRINGER J.Oxidation and hot corrosion of nickel-based alloys containing molybdenum[J].Corrosion Science,1976(16):791.
[11]PETTIT F S,MEIER G H,Oxidation and hot corrosion of superalloys[C]//Superalloys,1984.TMS,1984:651.
[12]SATOSHI U,YUICHIRO J,MAKOTO O,et al.Creep property and phase stability of sulfur-doped Ni-base single-crystal superalloys and effectiveness of CaO desulfurization[J].Metallurgical and Materials Transactions A,2018,49(9):4029-4041.
[13]SMIALEK J L.Effect of sulfur removal on Al2O3 scale adhesion[J].Metallurgical Transactions A,1991,22(3):739-752.
[14]SMIALEK J L.Oxidative recession,sulfur release,and Al2O3 spallation for Y-doped alloys[J].Scripta Materialia,2001,45(12):1327-1333.
[15]SMIALEK J L,TUBBS B K.Effect of sulfur removal on scale adhesion to PWA 1480[J].Metallurgical and Materials Transactions A,1995,26(2):427-435.
[16]MCVAY R V,WILLIAMS P,MEIER G H,et al.Oxidation of low sulfur single crystal nickel-base superalloys[C]//Superalloys.1992:807.
[17]SARIOGLU C,STINNER C,BLACHERE J R,et al.The control of sulfur content in nickel-base single crystal superalloys and its effects on cyclic oxidation resistance[C]//Superalloys.1996:71.
[2]REED R C,TAO T,WARNKEN N.Alloys-by-design:application to nickel-based single crystal superalloys[J].Acta Materialia,2009,57(19):5898-5913.
[3]陈鸿钧.IN738LC镍基高温合金高温蠕变疲劳性能研究[J].材料工程,1998(4):21-27.
[4]YUN D W,SEO S M,JEONG H W,et al.The cyclic oxidation behaviour of Ni-based superalloy GTD-111 with sulphur impurities at1100℃[J].Corrosion Science,2015,90:392-401.
[5]SATO A,CHIU Y L,REED R C.Oxidation of nickel-based single-crystal superalloys for industrial gas turbine applications[J].Acta Materialia,2011,59(1):225-240.
[6]常剑秀,王栋,董加胜,等.铼对镍基单晶高温合金恒温氧化行为的影响[J].材料研究学报,2017,31(9):695-702.
[7]HUANG L,SUN X F,GUAN H R,et al.Oxidation Behavior of a Single-Crystal Ni-base Superalloy in Air at 900,1000 and 1100℃[J].Oxidation of Metals,2006,65(3):207-222.
[8]王莉,刘心刚,张健,等.第三代单晶高温合金DD33的高温氧化行为[J].钢铁研究学报,2011,23(S2):353-356.
[9]KVERNES I A,KOFSTAD P.The oxidation behavior of some Ni-Cr-Al alloys at high temperatures[J].Metallurgical Transactions,1972,3(6):1511-1519.
[10]PETERS K R,WHITTLE D P,STRINGER J.Oxidation and hot corrosion of nickel-based alloys containing molybdenum[J].Corrosion Science,1976(16):791.
[11]PETTIT F S,MEIER G H,Oxidation and hot corrosion of superalloys[C]//Superalloys,1984.TMS,1984:651.
[12]SATOSHI U,YUICHIRO J,MAKOTO O,et al.Creep property and phase stability of sulfur-doped Ni-base single-crystal superalloys and effectiveness of CaO desulfurization[J].Metallurgical and Materials Transactions A,2018,49(9):4029-4041.
[13]SMIALEK J L.Effect of sulfur removal on Al2O3 scale adhesion[J].Metallurgical Transactions A,1991,22(3):739-752.
[14]SMIALEK J L.Oxidative recession,sulfur release,and Al2O3 spallation for Y-doped alloys[J].Scripta Materialia,2001,45(12):1327-1333.
[15]SMIALEK J L,TUBBS B K.Effect of sulfur removal on scale adhesion to PWA 1480[J].Metallurgical and Materials Transactions A,1995,26(2):427-435.
[16]MCVAY R V,WILLIAMS P,MEIER G H,et al.Oxidation of low sulfur single crystal nickel-base superalloys[C]//Superalloys.1992:807.
[17]SARIOGLU C,STINNER C,BLACHERE J R,et al.The control of sulfur content in nickel-base single crystal superalloys and its effects on cyclic oxidation resistance[C]//Superalloys.1996:71.