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在所设计的含2.8%~3.0%C,7%~9%Cr的中铬白口铸铁中,通过特定的工艺向铁水中添加一定量的氮,使氮在中铬白口铸铁凝固过程中以原子状态存在,考察氮对中铬白口铸铁凝固过程及其性能和组织的影响。 相似文献
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对白口铸铁采用稀土复合变质处理工艺进行了研究,试验了变质剂的加入量、凝固速度、碳当量、变质温度及时间等工艺因素对改善普通白口铸铁碳化物形貌的影响。结果表明,采用稀土复合变质处理及严格控制工艺因素后,白口铸铁的共晶碳化物由网状分布变成孤立块状分布,有的出现团球状,从而改善了白口铸铁的韧性,使低合金白口铁代替高铬白口铁成为可能。 相似文献
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RE-Si变质处理对钒白口铸铁组织及性能的影响 总被引:1,自引:0,他引:1
采用RE-Si复合变质剂对钒白口铸铁(1.80~2.10%V)进行变质处理,并制定了五种热处理工艺。试验结果表明,变质处理可以改善钒白口铸铁的组织和性能,热处理是进一步改善组织及性能的重要手段。本试验结果是,由1.0%SiFe+0.234%RE残复合变质处理并经1000℃正火处理,铸铁的综合性能最好,αk=18.78J/cm2;σbb=1322.02MPa;HRC=47.5;ε=1.43。 相似文献
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铬白口铸铁及其生产工艺的研究与发展 总被引:14,自引:0,他引:14
评述了国内外铬白口铸铁及其生产工艺的研究与应用情况,特别是成分、基体组织和铸造工艺对铬白口铸铁性能的影响。着重介绍了近些年中铬铸铁、复合铸造及金属型铸造工艺的研究与应用。作者还就目前铬白口铸铁及其生产工艺存在的问题和发展方向提出了看法。 相似文献
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铬系白口铸铁的研究进展 总被引:5,自引:0,他引:5
综述了铬系白口铸铁耐磨材料的国内外研究方向和研究现状,对低铬铸铁、中铬铸铁和高铬铸铁三类铬系白口铸铁的碳化物类型、制备工艺、性能特点、适用范围和现阶段开发程度进行了分析,综合评价了各类铬系白口铸铁的优缺点并探讨了其研究和应用未来的发展趋势。 相似文献
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研究了热变形量对钒白口铸铁击韧性的影响,结果表明,热变形能提高钒白口铸铁的冲击韧性,当钒白口铸铁经35%-45%热变形时,其冲击韧性最好。 相似文献
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Z. Sun S.L. Zheng Y. Zhang 《金属学报(英文版)》2007,20(3):187-192
Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process. 相似文献
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R. González-Martínez 《金属学报(英文版)》2007,20(4):235-240
The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke. 相似文献
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Deng-Kui Zhang Guo-Qing Wang Ai-Ping Wu Ji-Guo Shan Yue Zhao Tian-Yi Zhao Dan-Yang Meng Jian-Ling Song Zhong-Ping Zhang 《金属学报(英文版)》2019,32(6):684-694
In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone. 相似文献
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After nearly two years'tense construction the first phase of industrialized base of Shenyang Research Institute of Foundry 《中国铸造》2008,5(1):63-64
After nearly two years' tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry (SRIF), located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation. 相似文献
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综述了常见的电化学噪声数据处理方法,介绍了直流趋势剔除、统计分析、快速傅立叶变换(FFT)法计算功率谱密度(PSD)以及小波变换处理电化学噪声信号的基本过程,并阐释了各种数学处理及所得参数的物理意义。 相似文献
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Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems. 相似文献
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VINOD KAPUR 《中国铸造》2014,(5)
正I take great pleasure in congratulating CHINA FOUNDRY journal on its 10th anniversary.The CHINA FOUNDRY journal started ten years ago.Since its inaugural,China has seen exceptional growth in the Castings Sector and rapid development in Machinery Industry.The journal is becoming an important communication platform for experts 相似文献
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《机床与液压》2014,(12)
正Harbin General Hydraulic Machinery Works Co.,Ltd.of Yilin Hydraulic Group is the most professional production base of large-scale metallurgy oil cylinder and oil machinery cylinder in the Northeast of China.The main products include metallurgy cylinder,swell-shrink cylinder,rotating injection device,lifting cylinder,main lifting jack,front lifting jack,engineering oil cyl- 相似文献
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《机床与液压》2014,(12)
正Weihai HHH Mach.Elec.Group is the most technical company focusing on Power transmission and Hydra-controlling.HHH has the ability of developing and testing of complete sets of transmission system with relevant technical training.HHH provide efficient,excellent cost-effective power transmission system and intelligent electric fluid transmission and control system to OEM customers,who are 相似文献
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《中国铸造》2014,(5):460-463
The 9th China International Diecasting Congress and the 1st International Symposium on Nonferrous Alloys and Special Casting Technologies (ISNASCT) were successfully held in Shanghai on July 19-22, 2014. Both events were jointly sponsored by Chinese Mechanical Engineering Society, Die Casting Commission of World Foundry Organization and Non-Ferrous Materials Commission of World Foundry Organization, and organized by the Foundry Institution of Chinese Mechanical Engineering Society (FICMES) and China Productivity Promotion Center of Foundry Industry. 相似文献