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针对短流程CSP和半连轧2250 mm两种不同热轧工艺所生产的50W600无取向硅钢,进行力学拉伸试验、显微组织观察及织构分析,研究两种工艺生产的无取向硅钢在组织状态和整体性能上的差异。结果表明:短流程CSP工艺生产的50W600无取向硅钢显微组织较为均匀,平均晶粒尺寸较2250 mm热轧工艺生产的粗大,热轧板力学性能略低。短流程CSP工艺生产的50W600无取向硅钢成品板酸轧、连续退火后不利织构相对较少,磁性能优于2250 mm热轧工艺生产的50W600钢。 相似文献
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研究了900~1000 ℃正火对高锰50W470无取向硅钢的组织、织构和磁性的影响。结果表明,随着正火温度的升高,成品板的平均磁感不断增加,而铁损在975 ℃最低。热轧板正火后的晶粒尺寸随正火温度升高不断增大,而对应冷轧、退火后的成品板晶粒尺寸先增大后减小(975 ℃时最大)。在975 ℃×5 min正火后,成品板中得到对磁性有利的{100}面织构和高斯织构,磁性能改善。高锰50W470无取向硅钢的最佳正火工艺为975 ℃×5 min,此工艺可改善高锰无取向硅钢的组织和织构,最终提高其磁性能。 相似文献
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将低牌号无取向电工钢的原始铸坯采用不同的工艺轧制得到5组样品,在H_2气氛下进行相变退火处理,使其发生α→γ→α相变,采用EBSD、XRD和磁性能测量技术确定了不同轧制工艺对低牌号无取向电工钢相变退火组织、织构与磁性能的影响。结果表明,与常规再结晶退火处理相比,相变退火处理可显著粗化晶粒降低成品板铁损;相变过程中存在织构遗传现象,相比于热轧-冷轧工艺,直接冷轧工艺相变退火后更有利于获得{100}织构,并显著改善成品板的磁性能;低温热轧比高温热轧能保留更多的{100}取向晶粒,相变退火后成品板中的非{111}取向晶粒增多,并提高了成品板的磁性能;此外,工业板中P和Al元素的偏聚或氧化对相变退火后成品板的组织、织构与磁性能有不利影响。 相似文献
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采用光学显微镜、扫描电镜和X射线衍射仪等研究了不同退火温度对高牌号无取向3.2%Si钢成品板组织、织构及磁性能的影响规律.结果 表明:随着退火温度的升高,无取向3.2%Si钢的平均晶粒尺寸逐渐增加,但尺寸均匀度有所下降,退火板织构的整体强度呈先减后增的趋势,其中850℃退火板中出现了较强的Goss织构,1000℃退火板中α'纤维和Cube织构最强.在800~1000℃的范围内,随着退火温度的升高,无取向3.2%Si钢的铁损值逐渐降低,磁感值未出现显著差异.1000℃退火后,无取向3.2%Si钢的磁性能最佳,其铁损P15/50为2.50W/kg,磁感B50为1.69 T. 相似文献
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《热加工工艺》2021,(9)
基于电工钢传统轧制技术,采用温轧工艺制备了无取向Fe-3.1wt%Si钢,并研究了温轧温度对全流程组织、织构及成品板磁性能的影响规律。结果表明,随轧制温度的升高,变形晶粒内部的剪切带密度先升高后降低,温轧板织构强度逐渐减弱。轧制温度为120、360℃时,冷轧板与温轧板具有锋锐的α织构和中等强度的γ织构与λ织构;轧制温度达到600℃时,温轧板中出现了较强的Goss织构。退火板平均晶粒尺寸随轧制温度的增大先增大后减小。冷轧及轧制温度为120、360℃的退火板中的γ织构强度相近,其中120℃温轧后的退火板具有最强的λ织构,360℃温轧后退火板中γ织构与λ织构强度均较低。磁性能在120℃温轧时达到最优,此时铁损P1.5/50为2.18W/kg,磁感应强度B50为1.70 T。 相似文献
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基于薄带连铸技术,采用单阶段冷轧和两阶段冷轧工艺分别制备了0.35 mm和0.20 mm高牌号无取向硅钢,利用EBSD、XRD等检测手段分析了无取向硅钢制备全流程的组织和织构演变。研究表明,薄带连铸制备的铸带以粗大柱状晶为主,且具有较强λ纤维织构,取向密度达到4.76,无γ织构。正火处理后部分等轴晶粒长大,织构类型没有明显变化。单阶段冷轧板以α织构为主,经退火后再结晶织构以均匀λ织构和γ织构为主,强点为{001}<120>,取向密度为5.41。两阶段冷轧板以λ织构和γ织构为主,剪切变形明显。再结晶退火后组织相对粗大,且形成了较强的Cube织构,取向密度为6.45。得益于初始有利织构的遗传,试验钢具有高磁感、较高强度优势,且铁损值达到常规流程相当水平。0.35 mm退火板B50达到1.77 T,P1.0/400为20.78 W/kg。0.20 mm退火板B50为1.70 T,P1.0/400达到13.74 W/kg,高频铁损优势明显。两种规格无取向硅钢屈服强度均超过415 MPa,伸长率超过15%。 相似文献
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C.J. Sun H.R. Geng Y.S. Shen X.Y. Teng Z.X. Yang 《金属学报(英文版)》2007,20(3):181-186
The rheology feature of Sb, Bi melt and alloys was studied using coaxial cylinder high-temperature viscometer. The results showed that the curve of torsion-rotational speed for Sb melt presents a linear relation in all measured temperature ranges, whereas for the Bi melt, the curve presents obvious non-Newtonian feature within the low temperature range and at relative high shear stress. The rheology feature of Sb80Bi20 and Sb20Bi80 alloy melts was well correlated with that of Sb and Bi, respectively. It is considered that the rheology behavior of Sb melt plays a crucial role in Sb80Bi20 alloy and that of Bi melt plays a crucial role in Sb20Bi80 alloy. 相似文献
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Peng Liu Zhao-Kuang Chu Yong Yuan Dao-Hong Wang Chuan-Yong Cui Gui-Chen Hou Yi-Zhou Zhou Xiao-Feng Sun 《金属学报(英文版)》2019,32(4):517-525
The effect of heat treatment on the microstructures and mechanical properties of a newly developed austenitic heat resistant steel(named as T8 alloy) for ultra-supercritical applications have been studied. Results show that the main phases in the alloy after solution treatment are γ and primary MX. Subsequent aging treatment causes the precipitation of M_(23)C_6 carbides along the grain boundaries and a small number of nanoscale MX inside the grains. In addition, with increasing the aging temperature and time, the morphology of M_(23)C_6 carbides changes from semi-continuous chain to continuous network.Compared with a commercial HR3C alloy, T8 alloy has comparable tensile strength, but higher stress rupture strength. The dominant cracking mechanism of the alloy during tensile test at room temperature is transgranular, while at high temperature, intergranular cracking becomes the main cracking mode, which may be caused by the precipitation of continuous M_(23)C_6 carbides along the grain boundaries. Typical intergranular cracking is the dominant cracking mode of the alloy at all stress rupture tests. 相似文献
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《中国铸造》2014,(6):540-541
Organized by Suppliers China Co., Ltd and co-organized by the National Technical Committee 54 on Foundry of Standardization Administration of China, the 15th Global Foundry Sourcing Conference 2014 (hereinafter referred to as FSC 2014) was successfully held on Sep. 23rd in Grand Regency Hotel, Qingdao. More than 500 delegates from home and abroad attended this conference, including over 130 purchasers from 20 countries and 380 domestic and foreign suppliers. 相似文献
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By rolling and nitriding processes, 0.23- to 0.3-mm-thick grain-oriented 6.5 wt% silicon steel sheets were produced. The core losses of grain-oriented 6.5 wt% silicon steel at frequencies ranging from 400 Hz to 20 k Hz were lower than that of the grain-oriented 3 wt% silicon steel with the same thickness by 16.6–35.8%. The secondary recrystallization behavior was investigated by scanning electron microscopy, energy-dispersive spectroscopy, and electron backscattered diffraction. The results show that the secondary recrystallization in high-silicon steel sheets develops more completely as the nitrogen content increases after nitriding, secondary recrystallized grain sizes become larger, and the sharpness of Goss texture increases. Because more {110}116 grains in the subsurface and the central layer of the sheets have a lot of 20°–45° high-energy boundaries in addition to Goss grains, {110}116 can be the main component through selective growth during secondary recrystallization when the inhibitor quantity is not enough and inhibitor intensity is weaker. The increases in nitrogen content can increase the inhibitor intensity and hinder abnormal growth of a mount of {110}116 grains and therefore enhance the sharpness of Goss texture. 相似文献
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Laser Cladded TiCN Coatings on the Surface of Titanium 总被引:3,自引:0,他引:3
Y.L. Yang D. Zhang and H.S. Kou College of Science Northeastern University Shenyang China C.S. Liu College of Material Metallurgy Northeastern University Shenyang China 《金属学报(英文版)》2007,20(3):210-216
Laser cladded coatings of TiCN were produced on the surface of titanium. To obtain the optimal techniques, several conditions were tested by varying the laser scanning rate. The choice of shielding gas was also studied. The cladded coatings were then evaluated from the surface mechanics point of view based on their microhardness. The microstructure of some interesting samples was investigated by optical micrographs (OM). The results showed that under the condition of fixed pulse frequency and pulse width, the laser scanning rate and the shielding gas are the main factors influencing the components of coatings. TiCN coatings were decompounded and oxidized during the cladding process in the condition of no shielding gas of N2. X-ray diffraction results indicated that the composite coatings composed of TiCN, TiC, Ti2N, and TiO2 were produced using appropriate techniques. The results indicated that the best condition in terms of the surface microhardness is obtained when the scanning rate is 1.5mm / s, the pulse frequency is 15Hz, the pulse width is 3.0ms, and N2 is chosen as the shielding gas. The microhardness of the composite coatings is about 1331kg · mm - 2, which is about 4 times that of the substrate. The optical micrographs indicated that the cladding zone is made up of TiCN, TiO2, and some interdendritic Ti, but the diffusion zone mainly consists of the dendrites phase, and the cladded depth is about 80?滋m, which is more than 2 times that of the laser nitrided sample. There were no microcracks or air bubbles in the cladded sample, which was cladded using the above optimal techniques. 相似文献
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X80 pipeline steel plates were friction stir welded(FSW) under air, water, liquid CO_2 + water, and liquid CO_2 cooling conditions, producing defect-free welds. The microstructural evolution and mechanical properties of these FSW joints were studied. Coarse granular bainite was observed in the nugget zone(NZ) under air cooling, and lath bainite and lath martensite increased signifi cantly as the cooling medium temperature reduced. In particular, under the liquid CO_2 cooling condition, a dual phase structure of lath martensite and fi ne ferrite appeared in the NZ. Compared to the case under air cooling, a strong shear texture was identifi ed in the NZs under other rapid cooling conditions, because the partial deformation at elevated temperature was retained through higher cooling rates. Under liquid CO_2 cooling, the highest transverse tensile strength and elongation of the joint reached 92% and 82% of those of the basal metal(BM), respectively, due to the weak tempering softening. A maximum impact energy of up to 93% of that of the BM was obtained in the NZ under liquid CO_2 cooling, which was attributed to the operation of the dual phase of lath martensite and fi ne ferrite. 相似文献
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《中国铸造》2014,(3):215-217
China Securities News reported on March 21, 2014: Guangdong Hongtu Wuhan Die Casting Co., Ltd. (Wuhan Hongtu), a wholly owned subsidiary of Guangdong Hongtu Technology (Holdings) Co., Ltd., held a groundbreaking ceremony recently. With the registered capital of 50 million Yuan, Wuhan Hongtu has a total land area of 100,000 square meters and a plant construction area of 72,000 square meters. It is expected to have a production capacity of about 30,000 tonnes of aluminum castings annually after it is put into production. 相似文献
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Mg–Zn–Ag alloys have been extensively studied in recent years for potential biodegradable implants due to their unique mechanical properties,biodegradability and biocompatibility.In the present study,Mg–3Zn-x Ag(wt%,x=0.2,0.5 and0.8)alloys with single-phase crystal structure were prepared by backward extrusion at 340°C.The addition of Ag element into Mg–3Zn slightly influences the ultimate tensile strength and microstructure,but the elongation firstly increases from12%to 19.8%and then decreases from 19.8%to 9.9%with the increment of Ag concentration.The tensile yield strength,ultimate tensile strength and elongation of Mg–3Zn–0.2Ag alloy reach up to 142,234 MPa and 19.8%,respectively,which are the best mechanical performance of Mg–Zn–Ag alloys in the present work.The extruded Mg–3Zn–0.2Ag alloy also possesses the best corrosion behavior with the corresponding corrosion rate of 3.2 mm/year in immersion test,which could be explained by the single-phase and uniformly distributed grain structure,and the fewer twinning. 相似文献
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M.E Li G. C. Yang 《金属学报(英文版)》2007,20(4):258-264
Two new classes of growth morphologies, called doublons and seaweed, were simulated using a phase-field method. The evolution of doublon and seaweed morphologies was obtained in directional solidification. The influence of orientation and velocity on the growth morphology was investigated. It was indicated that doublons preferred growing with its crystallographic axis aligned with the heat flow direction. Seaweed, on the other hand, could be obtained by tilting the crystalline axis to 45°. Stable doublons could only exist in a range of velocity regime. Beyond this regime the patterns formed would be unstable. The simulation results agreed with the reported experimental results qualitatively. 相似文献