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国家自然科学基金(51371188)

作品数:10 被引量:37H指数:4
相关作者:周兴泰李志军怀平范金鑫张继祥更多>>
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10 条 记 录,以下是 1-10
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Effects of Si Addition and Long-Term Thermal Exposure on the Tensile Properties of a Ni–Mo–Cr Superalloy被引量:4
2015年
The effect of long-term thermal exposure on the grain boundary carbides and the tensile behavior of two kinds of Ni–Mo–Cr superalloys with different silicon contents(0 and 0.46 wt%) was investigated. Experimental results showed granular M2C carbides formed at the grain boundaries after exposure for 100 h for the non-silicon alloy. Furthermore, these fine granular M2C carbides will transform into plate-like M6C carbides as exposure time increases. For the Si-containing alloys,only the granular M6C carbides formed at the grain boundaries during the whole exposure time. The coarsening of the grain boundary carbides occurred in both alloys with increasing exposure time. In addition, the coarsening kinetics of the grain boundary carbides for the non-silicon alloy is faster than that of the standard alloy. The tensile properties of both alloys are improved after exposure for 100 h due to the formation of nano-sized grain boundary carbides. The grain boundary carbides are coarsened more seriously for non-silicon alloys than that of Si-containing alloys, resulting in a more significant decrease in the tensile strength and elongation for the former case. Silicon additions can effectively inhibit the severe coarsening of the grain boundary carbides and thus avoid the obvious deterioration of the tensile properties after a long-term thermal exposure.
Zhou-Feng XuJia-Sheng DongLi JiangZhi-Jun LiXing-Tai Zhou
Speciation study of chromium corrosion product in molten LiF-NaF-KF salt
2015年
To investigate the corrosion products of Cr in molten FLi Na K salt(46.5 mol% Li F–11.5 mol% Na F–42mol% KF), the corrosion test of the pure metal Cr was performed in molten FLi Na K salt at 700?C for 200 h.The FLi Na K salt after the corrosion test was thoroughly investigated by X-ray absorption near-edge structure spectroscopy, a transmission electron microscope, and X-ray diffraction. The results demonstrate that the predominant oxidation state of Cr in FLi Na K salt is Cr^(3+), and the main corrosion product in cooled FLi Na K salt is K_2NaCrF_6.
邱杰邹杨俞国军何上明刘文冠贾彦彦李志军徐洪杰
关键词:金属铬
新型低Cr镍基合金GH3535高温氧化行为被引量:12
2015年
采用静态增重法,研究了GH3535合金在700~980℃温度范围内空气中的恒温氧化行为。利用扫描电镜(SEM)、X射线衍射仪(XRD)和电子探针(EPMA)分析了GH3535合金高温氧化膜表面与截面形貌、表面氧化膜的相组成以及氧化层中元素分布情况。结果表明GH3535合金在700℃氧化后表面氧化膜无明显剥落,氧化动力学曲线遵循立方规律,氧化膜厚度4μm左右。870和980℃时氧化物出现剥落,870℃下无内氧化现象发生。GH3535合金在3个温度下的氧化速率分别为0.064,0.073和0.200 g·(m2·h)-1,根据氧化等级评定,700和870℃时属于完全抗氧化等级;而980℃时GH3535合金转变为抗氧化等级。GH3535合金700℃时氧化膜主要组成是外层Ni O和Ni Fe2O4等复合氧化物,中间层是Cr2O3,Ni Cr2O4,Mo O2和Ni Mn2O4等氧化物;870℃氧化膜分层同700℃一致,但外层Ni O含量降低,内层Cr2O3厚度增加;980℃时外层Ni O已剥落掉,露出内部Cr2O3等氧化层,并出现了Al2O3内氧化层。
范金鑫张继祥陆燕玲李志军周兴泰怀平
关键词:高温氧化氧化动力学氧化膜
Improving oxidation resistance of Ni-16Mo-7Cr-4Fe nickel-based superalloy by yttrium microalloying
2015年
Microstructure and oxidation behavior of modified Ni-16Mo-7Cr-4Fe alloys by yttrium microalloying were investigated by scanning electron microscopy, transmission electron microscopy, grazing incident Xray diffraction and synchrotron radiation X-ray fluorescence. M6 C and Ni17Y2 phases were observed and the amount of Ni17Y2 increased with yttrium concentration. When the yttrium concentration increased to 0.43 wt.%,some Ni17Y2 chains and multi phase regions containing Ni17Y2, M6 C and γ phase appeared, which is harmful for the oxidation resistance. The alloy containing 0.05 wt.% yttrium showed the best oxidation resistance, which derives its oxidation resistance from the adequate concentration of yttrium in the solid-solution(γ phase), the formation of the protective layer of YCr O3 and chromia oxide and the strengthening effect of yttrium on oxide boundaries.
李晓丽何上明周兴泰李志军邹杨李爱国余笑寒
关键词:钇合金镍基高温合金透射电子显微镜
316H堆焊UNS N10003合金参数优化、组织和硬度的研究
2020年
研究异种合金焊接可以降低熔盐堆结构材料的成本并确保其安全性,本文采用钨极氩弧焊(GTAW)工艺,在316H不锈钢表面堆焊一层耐高温熔盐腐蚀的UNS N10003合金,优化了焊接工艺参数,通过光学显微镜(OM)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、维氏硬度计等研究了堆焊层及界面的形貌、组织和硬度,为进一步研究多层、多道堆焊提供理论依据。研究结果表明:当电流一定时,稀释率随送丝速度的增加而减小,堆焊层高度随送丝速度的增加而增加,当送丝速度一定时,改变电流大小,堆焊层高度的变化范围为0.2~0.5 mm。堆焊层界面处可以细分为对流混合区(WM)、非对流混合区(UZ)和热影响基体区(BM)。堆焊层主要为奥氏体组织,在WM区有大量富Mo的M2C碳化物析出,UZ区的析出相主要是δ铁素体;316H基体区和WM区硬度分别为(160±10)HV和(202±11)HV,在γ基体的枝晶界上分布着尺寸细小的骨架状碳化物导致WM区硬度升高。
杨飞黎超文李志军蒋力叶祥熙刘芳
关键词:堆焊层稀释率参数优化UNS
微束分析仪器在金属材料研究中的应用被引量:10
2017年
简述了微束分析仪器电子探针(EPMA)和扫描电镜(SEM)的原理和功能,对比了波谱仪(WDS)和能谱仪(EDS)的差异。使用这两类仪器对稀土镁合金、铝合金焊接区域及镍合金渗碲实验样品进行了测试和分析。结果表明镁合金中稀土的分布主要富集于晶界但不连续;铝合金焊接区域的元素存在局部偏聚现象;碲在镍基合金晶界富集,并沿着晶界向基体扩散。这些不同类金属的元素分布特征都可以在EPMA的面分析结果上直观体现出来。同时对比了EDS和WDS的性能,在微区分析中WDS的分辨率和灵敏度均较EDS更有优势。
贾彦彦赵同新李哲夫
关键词:电子探针能谱仪波谱仪
Microstructure and Mechanical Properties of Fiber Laser Welded GH3535 Superalloy被引量:3
2017年
As a primary material of the thorium molten salt reactor(TMSR) that is a suitable candidate reactor of the Generation IV nuclear reactors, GH3535 superalloy was successfully welded. The effect of laser beam welding(LBW) on microstructure evolution of fusion zone(FZ) and heat affected zone(HAZ), such as element segregation, precipitate behavior and grain evolution, was investigated. The microhardness and tensile properties were tested and discussed. The results of microstructure evolution showed that a number of fine M6C-y eutectic phases precipitated at solidification grain boundaries and interdendritic region in FZ. Compared to base metal zone(BMZ), the grain size of HAZ has no obvious change. While a few of M6C-y eutectic phases were observed in partially melted zone(PMZ) of HAZ. The results of microhardness indicated that the hardness of FZ was higher than that of HAZ and BMZ. The results of tensile test showed that the ultimate tensile strength of joints at room temperature, 650 and 700?C were98%, 97% and 99% of that of BM, respectively. All the tensile specimens of joints failed in BMZ rather than in PMZ where M6 C carbides had been transformed into M6C-y eutectic phases.
Kun YuZhenguo JiangChaowen LiShuangjian ChenWang TaoXingtai ZhouZhijun Li
Te诱导纯Ni脆化的时效研究
2018年
熔盐实验堆中的裂变产物碲(Te)会导致堆内镍基合金结构材料晶间开裂,引起合金部件的失效,危害熔盐堆的安全运行。简化研究体系,在Ni基体上电镀Te薄膜,然后在700℃下对样品进行不同时间的真空热扩散,分析扩散后界面反应产物、合金微观结构、拉伸性能及断口形貌等变化。结果表明,界面反应产物Ni_3Te_2在700℃下具有很好的热稳定性;有Te扩散的纯镍样品拉伸性能下降更明显,拉伸断口为混合型断口;随着扩散时间的延长,Te在纯镍中的扩散深度逐渐加深。
贾彦彦李哲夫邱杰冷滨
关键词:TE抗拉性能晶间断裂
Ti3SiC2、Ti3AlC2在LiF-NaF-KF熔盐中的腐蚀行为研究被引量:5
2014年
研究了三元层状化合物Ti3SiC2、Ti3AlC2在熔融LiF-NaF-KF盐中的腐蚀行为,探索其腐蚀机理及抗腐蚀性能。研究发现,这两种MAX相材料在熔融FLiNaK盐中的腐蚀表现为A元素的溶解,进而形成腐蚀产物TiCx。数据表明,Ti3SiC2表现出比Ti3AlC2更好的抗腐蚀性,Ti3AlC2中的A元素Al几乎全部溶解,而Ti3SiC2中A元素Si溶解只发生在表层及浅表层。从理论分析和微结构表征方面对实验现象进行了解释,并且针对由六方Ti3AlC2转变为立方TiCx提出了相应的机理。
李凌俞国军周兴泰
关键词:熔盐
GH3535合金700℃恒温氧化行为研究被引量:5
2015年
利用增重法,研究了GH3535合金在700℃/700 h下的恒温氧化行为。采用扫描电镜(SEM)、X射线衍射(XRD)、电子探针(EPMA)和同步辐射荧光(SRXRF)分析技术研究了GH3535合金高温氧化膜的氧化动力学、形貌及氧化物的组成。结果表明,GH3535合金在700℃/700 h氧化后表面氧化膜无明显剥落,氧化动力学曲线遵循立方规律,氧化膜厚度为5μm左右,无内氧化现象发生。700℃下,GH3535合金属于完全抗氧化等级。合金表面生成的氧化膜成分以Ni O、Cr2O3、Ni Cr2O4和Ni Mn2O4为主。
范金鑫陆燕玲李志军董加胜张继祥周兴泰怀平
关键词:高温氧化氧化动力学氧化膜
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