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针对通化钢铁股份有限公司试制的SS400B厚规格热轧板卷强度偏高、伸长率较低的问题,分析了卷取温度、冷却模式对板卷性能的影响。结果表明,卷取温度对SS400B热轧板卷力学性能影响明显,随卷取温度的提高,板卷晶粒尺寸增大,屈服强度、抗拉强度显著降低;层流冷却模式能够改善板卷组织性能,延长冷却时间、适当降低冷却速率可以一定程度降低其强度并提高其塑性;在目前成分设计下,采用650~670℃卷取温度和均匀冷却工艺可以保证SS400B板卷获得最佳性能,其屈服强度为340MPa,抗拉强度为500MPa,伸长率为23%。 相似文献
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成分和卷取温度对热轧铌微合金钢组织和性能的影响 总被引:1,自引:0,他引:1
研究了化学成分,特别是铌含量的增加对铌微含金钢热轧板组织性能的影响;分析了不同的卷取温度对相同铌含量的热轧板组织性能的影响,同时分析比较了卷取温度对低碳钢组织性能的影响.结果表明.铌含量由0.017%增加到0.03%,沉淀强化作用相对于晶粒细化作用更为显著;550℃、600℃、650℃的卷取温度对铌含量0.017%的热轧板组织性能影响不大,同样750℃、550℃卷取温度对成分相近的低碳钢组织性能影响也不大,这对热轧板生产具有一定参考意义. 相似文献
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以C-Si-Mn-Cr成分体系双相钢为研究对象,采用金相显微镜、扫描电镜、拉伸试验等方法,对终轧温度、卷取温度、退火温度等工艺参数对C-Si-Mn-Cr系双相钢组织和性能的影响进行了研究。结果表明,降低终轧和卷取温度,热轧板组织由铁素体+珠光体转变为铁素体+珠光体+贝氏体,同时热轧板的屈服强度和抗拉强度都有所提高;当冷轧和退火工艺相同时,对采用低温终轧和低温卷取生产的双相钢来说,其抗拉强度由472 MPa增加到524 MPa,而屈服强度则变化不大,此时伸长率和n值略有降低;通过采用低温卷取+中温退火工艺,可以实现一种成分体系生产CR260/450DP和CR290/490DP两种强度级别双相钢的柔性化生产目标。 相似文献
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对不同卷取温度下540MPa级热轧酸洗板的组织性能进行了研究。结果表明,卷取温度为380℃时,540 MPa级热轧酸洗板组织为铁素体+粒状贝氏体,R_(eL)≥440MPa、R_m≥550MPa,A≥28%,扩孔率达100%;当卷取温度为290℃时,钢板组织中出现了马氏体,其屈服强度和抗拉强度明显提升,扩孔性能和伸长率下降;当卷取温度降至220℃时,钢板组织中出现了大量马氏体。因此,为获得理想的强度、塑性及扩孔性能,卷取温度不宜过低。 相似文献
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《金属学报》2016,(5)
利用OM,EBSD,TEM,XRD及物理化学相分析法,对不同卷取温度下Ti-V-Mo复合微合金化热轧高强钢的强化增量进行了估算和分析,分别讨论了卷取温度对屈服强度和MC相粒子对均匀塑性的影响规律.结果表明,在600℃卷取时具有最佳的综合力学性能:抗拉强度为1134 MPa,屈服强度为1080 MPa,延伸率为13.2%,均匀延伸率为6.8%,其析出强化增量sp在444~487 MPa范围内,甚至更高,主要是由质量分数高达72.6%的10 nm以下的(Ti,V,Mo)C粒子提供的.析出强化和细晶强化是主要的强化方式,sp的改变是导致不同卷取温度下屈服强度变化的主要因素.随着卷取温度由500℃升高至600℃,抗拉强度和屈服强度均不断增加,均匀延伸率不但没有降低,反而呈线性缓慢增加.其主要原因是sp对屈服强度的贡献量不断提高,在提高强度的同时改善了均匀塑性. 相似文献
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通过实验,采用低成本Ti微合金元素进行强化,获得了抗拉强度745~760MPa,下屈服强度640~655MPa,伸长率为23. 0%~23. 5%的热轧钢板。同时,通过调整热轧工艺,获得了终冷温度与热轧板强度的关系。此外,研究了轧制过程不同阶段析出相的种类、分布以及析出量的变化情况。结果表明,钢板屈服强度、抗拉强度与其终冷温度基本呈线性关系,随终冷温度的降低,屈服强度和抗拉强度均明显提高。析出相的定量分析结果表明,在粗轧结束时,Ti的析出率接近50%,在精轧结束时,Ti的析出率接近60%。在700℃等温卷取后,Ti的析出率超过95%。降低卷取温度到650、600℃时,Ti的析出率分别降低到87. 5%、75. 2%。如果700℃终冷后采用空冷方式冷却,Ti的析出率最低,降低到只有63. 3%,与精轧结束时析出量相近。 相似文献
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以550MPa级微合金化高强度钢为研究对象,研究了冷却模式和卷取温度对钢板力学性能与显微组织的影响。结果表明,冷却方式对钢板的组织与性能影响较小。卷取温度为605℃时,抗拉强度达到702 MPa,-20℃冲击功为63.4 J。 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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The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C). 相似文献
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The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel. 相似文献
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Tang Dynasty 《中国铸造》2014,(4):I0002-I0003
<正>Bronze mirrors were used by the Chinese people before the introduction of the glass mirror.Only after it was replaced by the glass mirror did the bronze mirror gradually retreat from people's lives.Different styles of bronze mirrors were made in different historical periods,particularly in the Warring States Period,the Han and Tang Dynasties,which were the three peaks of the development of bronze mirror arts in ancient China.The casting techniques were exquisite.The surface of the bronze mirror was smooth and bright enough to reflect one's image,and there were scarcely any casting defects on the mirror surface.On the back of the bronze mirror,there were rich depictions of Arts and Humanities,and the ornamentations were also 相似文献
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《中国铸造》2014,(5):464-466
The 9th China International Diecasting Congress & Exhibition was held on July 22-24, 2014 at Shanghai New International Expc Centre. This exhibition was the most successful over the years, with over 6890 visitors and 155 exhibitors, and the exhibition area increased by 30% from 9,500 square meters in 2012 to 12340 square meters. Die casting enterprises from a total of 24 countries and regions, including China mainland, Chinese Taiwan and Hong Kong, South Korea, Japan, Germany, India, Thailand, Malaysia, the United States, Russia, Australia, Iran, Ukraine, Brazil, Colombia, Singapore, Austria, Canada, Croatia, France, Turkey, United Kingdom, Vietnam, attended the congress and exhibition. 相似文献
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《机床与液压》2014,(12)
正The Fluid Control Engineering Institute of Kunming University of Science and Technology was set up in 1996.The researches of institute concentrate on electro-hydraulic(pneumatic)servo/proportional control and hydromechatronics.The Institute is committed to research and development of electro-hydraulic control of high-end technical equipment in ferrous metallurgy refining produc- 相似文献
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Y. Wang H.Z. Li C.N. Yu G.M. Wu I. Gordon P. Schattschneider O. Van Der Biest 《金属学报(英文版)》2007,20(3):167-170
Antimony induced crystallization of PVD (physics vapor deposition) amorphous silicon can be observed on sapphire substrates. Very large crystalline regions up to several tens of micrometers can be formed. The Si diffraction patterns of the area of crystallization can be observed with TEM (transmission electron microscopy). Only a few and much smaller crystals of the order of 1μm were formed when the antimony layer was deposited by MBE (molecular beam epitaxy) compared with a layer formed by thermal evaporation. The use of high vacuum is essential in order to observe any Sb induced crystallization at all. In addition it is necessary to take measures to limit the evaporation of the antimony. 相似文献
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A CUMULATIVE FATIGUE DAMAGE RULE UNDER THE ALTERNATIVE OF CORROSION OR CYCLIC LOADING 总被引:2,自引:0,他引:2
W.X. Yao 《金属学报(英文版)》2007,20(1):65-71
Fatigue damage increases with the applied loading cycles in a cumulative manner and the material deteriorates with the corrosion time. A cumulative fatigue damage rule under the alternative of corrosion or cyclic loading was proposed. The specimens of aluminum alloy LY12-CZ soaked in corrosive liquid for different times were tested under the constant amplitude cyclic loading to obtain S-N curves. The test was carried out to verify the proposed cumulative fatigue damage rule under the different combinations among corrosion time, loading level, and the cycle numbers. It was shown that the predicted residual fatigue lives showed a good agreement with the experimental results and the proposed rule was simple and can be easily adopted. 相似文献