共查询到20条相似文献,搜索用时 109 毫秒
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高能球磨制备Zn-Al合金 总被引:1,自引:0,他引:1
用高能球磨方法制备锌铝合金粉末,用SEM等方法表征粉末的组织形貌。结果表明:在一定的球料比和球磨时间下,在特定助剂的作用下,形成固溶体合金。 相似文献
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在水热条件下,通过氧化钆的水化来制备具有棒状形貌的氢氧化钆,用X射线衍射(XRD)、扫描电镜(SEM)研究了结晶产物的物相类型和外观形貌,考察了碱的存在与否,以及碱浓度和水热时间对氧化钆水化速度和产物外观形貌的影响.结果表明,氧化钆在水热条件下可以直接与水反应形成氢氧化钆,但速度较慢.添加一定量的氢氧化钠可以促进氧化钆向氢氧化钆的物相转变,所得产物为具有六方相结构的空心短棒. 相似文献
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A. B. Sychkov A. Yu. Stolyarov G. Ya. Kamalova Yu. Yu. Efimova L. Yu. Egorova A. E. Gulin 《Steel in Translation》2017,47(8):564-570
The microstructure formed in the surface layer of industrially produced steel 70 wire rod (diameter 5.5 mm), wire (diameter 4.2 mm), and thin brass-plated steel 70 wire (diameter 0.933–1.75 mm) is studied. Local surface sections with turbulent structure are identified by means of transmission and scanning electron microscopy and microhardness measurements. Those sections are associated with shear stress forming additional rotary deformation modes. With increase in the deformation, a gradient in the microhardness appears. The hardness is greatest at the surface in sections with anomalous structure. The dynamics of dislocational structure in metal with deformation is investigated. The formation of pearlite colonies in high-carbon steel is studied. The results may be used in determining the limiting deformability of wire rod and wire on drawing. 相似文献
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对大规格SWRH82B高碳钢盘条自然时效后的力学性能变化规律进行了较为系统的研究;借助OM、SEM、EDS和XRD等对其显微组织、夹杂物成分与分布、宏观与微观断口形貌、物相结构和残余应力等进行测试与分析。结果表明,82B盘条的断面收缩率随时效时间延长明显升高。满足盘条力学性能所需的时效时间与初始性能和环境温度有关;盘条中的夹杂物分布不均,且存在尺寸较大的复合脆性夹杂物,导致出现“黑心+白点”特征的断口形貌;时效后残余应力的释放和晶格畸变的减小是引起盘条断面收缩率提高的主要原因。 相似文献
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摘要:为探索高碳硅镇静钢中失效夹杂物的检测方法,通过大量分析切割钢丝拉拔断口明确了失效夹杂物类型,同时利用失效指数验证金相观察法、电镜分析法、极值统计法、电解法、盘条拉伸法等评价夹杂物的有效性。结果表明,以帘线钢、切割钢丝用钢为代表的高洁净度高碳硅镇静钢,失效夹杂物以高铝夹杂物为主,尺寸集中在10~40μm。断口分析是失效夹杂物的最直接评价方法,但耗时长。金相制样法评价失效夹杂物往往与实物质量不符。有机溶物电解法可以用来分析冶炼过程高铝夹杂物变化,为失效夹杂物控制提供方向。未时效盘条拉伸实验,可快速检测出高碳钢盘条中大尺寸夹杂物。 相似文献
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High-carbon wire rod made of steel microalloyed with vanadium 总被引:1,自引:0,他引:1
V. V. Parusov A. B. Sychkov I. V. Derevyanchenko A. V. Perchatkin É. V. Parusov M. A. Zhigarev 《Metallurgist》2004,48(11-12):618-625
The Moldavian Metallurgical Combine has mastered the production of quality vanadium-bearing high-carbon wire rod 5.5–12.0 mm in diameter. Strengthening of the grain boundaries of the steel and its dispersion-hardening significantly increase the strength properties of wire rod made of steel that has been microalloyed with vanadium, while the ductility of the product also remains high. Tests in which vanadium-bearing high-carbon wire rod 5.5–12.0 mm in diameter was drawn into 3–7-mm-diam. wire were conducted at hardware plants and showed that the wire rod is well-suited for the production of wire used in the reinforcement of prestressed concrete structures. 相似文献
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The determination of the microstructural and forming parameters of rods and wire from low to medium-alloy quenched and tempered as well as spring steel grades is a prerequisite for the mathematical modelling and optimization of the technology on the basis of process and material criteria. Using the boundary, heat balance and finite difference methods as well as visioplastic investigations, the most important forming parameters were determined in high-speed rolling. The rolling of such steel grades allowed to determine the material constants for the dynamic and static equations of recrystallization. Due to the inhibitive effect of the alloying elements (Mo, V) the investigated steel grades display a comparatively pronounced recrystallization inertia. Accordingly, the austenitic post-recrystallization grain size is very fine and relatively independent of the temperature. Temperature control during rod and wire rolling allows to influence and adjust the austenitic microstructure prior to phase transformation. 相似文献
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