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通过对高氮低镍奥氏体不锈钢(0Cr25Ni2Mn17Mo1NbN)进行1100℃固溶处理,水冷,利用万能拉伸试验机测试其力学性能并和316L奥氏体不锈钢进行对比。将高氮低镍奥氏体不锈钢在不同温度(700、750、800℃)时效2 h,利用光学显微镜和洛氏硬度计,观察不同温度下时效2 h试验钢的析出状况和试验钢的硬度,利用扫描电镜、透射电镜来观察和分析试验钢800℃析出物的形貌及种类。试验结果表明,高氮低镍奥氏体不锈钢在1100℃固溶处理后有良好的力学性能,高氮低镍奥氏体不锈钢在800℃大量析出相为σ相,其次是Cr2N,伴有少量Cr23C6析出,还有微量Nb(C,N)析出。析出相形态有胞状、短棒状和片状布满整个基体。试验钢时效后的硬度值要比时效前(固溶态)的硬度值高,且试样随时效温度升高其硬度值呈现上升趋势。 相似文献
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高能球磨和冷压烧结制备Cr-Mn-Mo-N无镍不锈钢 总被引:1,自引:0,他引:1
崔大伟 《稀有金属材料与工程》2008,37(12)
采用高能球磨结合高温渗氮方法制备了Cr18Mn12Mo3N无镍高氮不锈钢粉末,随后利用冷压烧结工艺获得了无镍高氮奥氏体不锈钢材料。结果表明:制备的高氮复合粉末近球形,具有良好的成形性;Cr18Mn12Mo3N不锈钢的最佳烧结温度为1250℃,相对密度达到97.1%,氮含量为0.79%(质量分数);经过1150℃固溶处理水冷后能获得完全奥氏体组织,其钝化电位范围宽,点蚀电位高,抗点蚀性能显著优于316L不锈钢。 相似文献
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为了探索高氮无镍奥氏体不锈钢激光焊接的可行性,采用1. 0、1. 5和2. 0 k W功率的激光对含0. 092%C、0. 59%N、17. 69%Cr、13. 83%Mn和2. 89%Mo(质量分数)的不锈钢试样进行了辐照。对辐照区的熔池、熔合区、热影响区进行了金相检验、背散射电子衍射(EBSD)和硬度测定。结果表明:高氮无镍奥氏体不锈钢熔池呈上宽下窄的形状;用1和2 kW激光辐照的钢熔池的最大深度分别为2. 7和3. 9 mm。以不同功率激光辐照的钢,熔池区的硬度最低,为320 HV0. 2左右,热影响区内再结晶区硬度最高,为350 HV0. 2左右,熔合区硬度居于二者之间。此外,熔池内有大量的亚晶,其取向差约为2°~5°。 相似文献
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A. A. Babakov 《Metal Science and Heat Treatment》1967,9(10):764-770
Conclusions Highly alloyed steels and alloys are produced in conformity with GOST or technical specifications in thick and thin sheets, beams and channels, bars, hot-rolled and cold-rolled pipe, and rod. Castings are produced in the specialized plant of the Ministry of Chemical and Petroleum Machine Building.The technology of welding stainless steels and alloys is given in [15] and [16].TsNIIChERMET. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 10, pp. 43–50, October, 1967. 相似文献
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模具渗硼工艺及其发展应用 总被引:4,自引:0,他引:4
渗硼是提高模具使用寿命的重要途径,是在金属表面形成高硬度的金属硼化层,显著提高其耐磨性,且具有良好的耐热性和耐蚀性。近年来,随着渗硼工艺逐步改进和完善,已发展了复合渗、多元共渗及低温渗硼工艺,取得了良好的经济效果。 相似文献
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A. Yu. Tsivadze G. V. Ionova V. K. Mikhalko 《Protection of Metals and Physical Chemistry of Surfaces》2010,46(2):149-169
The possibility of using unique properties of lanthanides in the nanotechnology is demonstrated. The origination of linear
and nonlinear optical properties of lanthanide compounds with phthalocyanines, porphyrins, naphthalocyanines, and their analogs
in solutions and condensed state and the prospects of obtaining novel materials on their basis are discussed. Based on the
electronic structure and properties of lanthanides and their compounds, namely, optical and magnetic characteristics, electronic
and ionic conductivity, and fluctuating valence, molecular engines are classified. High-speed storage engines or memory storage
engines; photoconversion molecular engines based on Ln(II) and Ln(III); electrochemical molecular engines involving silicate
and phosphate glasses; molecular engines whose operation is based on insulatorsemiconductor, semiconductor-metal, and metal-superconductor
types of conductivity phase transitions; solid electrolyte molecular engines; and miniaturized molecular engines for medical
analysis are distinguished. It is shown that thermodynamically stable nanoparticles of Ln
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M
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composition can be formed by d elements of the second halves of the series, i.e., those arranged after M = Mn, Tc, and Re.
Prospects of using lanthanide superconductors in nanotechnology are considered. 相似文献
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金刚石、CBN有序排列及择优取向工具的研发及应用 总被引:1,自引:0,他引:1
有序排列/择优取向超硬材料工具的技术创新,将广泛适用于电镀、树脂、陶瓷、金属结合剂制品工具中,使用超硬材料颗粒在结合剂中均匀排列并择优定向,以最大潜能的发挥超硬材料各个方面固有的特性。并针对不同的加工对象,有选择性的使用超硬材料各自不同的特性,从而使超硬材料工具将以经济、高质与高效的优势替代传统的超硬材料工具并将进入新兴的加工领域,为生产企业带来新的发展机遇。本文将对有序排列与择优取向技术的研究现状及其在不同的金刚石工具中的应用做一阐述。 相似文献
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V. Kulikovsky V. Vorlí?ek M. Stranyánek R. ?tvrtlík A. Kurdyumov 《Surface & coatings technology》2008,202(9):1738-1745
Hydrogen-free amorphous and nanocrystalline films were prepared by magnetron sputtering of the SiC or Si targets. Mechanical properties (hardness, elastic modulus, intrinsic stress) and film structures were investigated in dependence on the substrate bias and temperature. It was found that both hardness and elastic modulus of all amorphous a-SiC films prepared at different substrate temperatures and biases are always lower than those for bulk α-SiC single crystal while the hardness of partially crystalline SiC films is higher and the elastic modulus lower than those for α-SiC one. In contrast, both hardness and elastic modulus of all amorphous Si films are always lower than those for nanocrystalline Si films which show approximately the same value as the Si single crystal. 相似文献