共查询到20条相似文献,搜索用时 31 毫秒
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O. A. Bannykh S. Ya. Betsofen E. I. Lukin V. M. Blinov N. M. Voznesenskaya O. A. Tonysheva E. V. Blinov 《Russian Metallurgy (Metally)》2016,2016(4):380-384
The effect of the rolling temperature and strain on the structure and the properties of corrosionresistant austenitic–martensitic 14Kh15AN4M steel is studied. The steel is shown to exhibit high ductility: upon rolling in the temperature range 700–1100°C at a reduction per pass up to 80%, wedge steel specimens are uniformly deformed along and across the rolling direction without cracking and other surface defects. Subsequent cold treatment and low-temperature tempering ensure a high hardness of the steel (50–56 HRC). Austenite mainly contributes to the hardening upon rolling in the temperature range 700–800°C at a reduction of 50–70%, and martensite makes the main contribution at higher temperatures and lower strains. Texture does not form under the chosen deformation conditions, which indicates dynamic recrystallization with the nucleation and growth of grains having no preferential orientation. 相似文献
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对钛/钢组坯进行冷轧预复合成形,将钛/钢预复合板感应加热至热轧温度后单道次热轧成形制备了钛/钢复合板,研究了感应加热温度对钛/钢复合板的界面组织和界面结合性能的影响。结果表明,冷?热轧制复合法制备的钛/钢复合板的界面结合紧密,没有孔洞和间隙。钛/钢复合板由于感应加热和热轧的时间较短(<5 s),钛/钢界面仅有少量硬化层碎块,没有金属间化合物析出。钛/钢复合板的界面Ti和Fe元素扩散层宽度随感应加热温度增大而增大,950 ℃时界面扩散层宽度达到8 μm。在感应加热温度为750 ~ 950 ℃的条件下,钛/钢复合板的界面结合良好。 相似文献
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本钢薄板坯连铸连轧生产线在调试生产阶段,精轧机乃多次出现轧裂卡钢停产事故。对轧裂钢板试样进行组织、夹杂物分析,结果表明,钢板严重的组织不均匀性是导致Q235热轧钢板轧裂的主要原因。采取降低连铸时钢水的过热度、提高铸坯出加热炉温度及增大粗轧阶段的压下量等工艺措施后,没有出现过F3轧裂卡钢事故。 相似文献
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The paper is concerned with the mathematical model for the computation of the technological as well as force and energy parameters during rolling of austenitic steel sheets and strips at elevated temperatures. On the basis of the computation results obtained for 18–8 type chromium-nickel steel (marked 1H18N9T) universal nomograms have been designed for a wide range of strip width and roll diameters. They allow the evaluation of force parameters, energy consumption and average temperature in the roll pass depending on the reduction and strip initial temperature as well as strip relative thickness. The presented nomograms might be helpful in designing the technology for warm rolling of austenitic steel sheets and strips as well as conventional cold-rolling, taking into consideration thermal effects in the deformation zone. 相似文献
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以钛微合金化的355 MPa级低合金高强度钢为研究对象,将试验钢分别在830、800、750、700 ℃系列温度下终轧,研究了终轧温度对显微组织和力学性能的影响。结果表明,随着终轧温度的降低,屈服强度和抗拉强度呈现不断升高的趋势,伸长率和冲击性能呈现先升高后下降的趋势,在Ar3温度附近终轧,钢板可获得最佳的综合力学性能。不同终轧温度下钢板基体组织均为铁素体+珠光体,在800 ℃终轧钢板晶粒最为均匀细小,830 ℃终轧钢板晶粒较800 ℃终轧相对粗大,750 ℃终轧钢板组织出现混晶现象,700 ℃终轧时,钢板晶粒已经拉长变形,一定程度上出现“纤维状铁素体”。充分细化晶粒可以减轻钢板中的带状组织。 相似文献
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对305 mm x315 mm中间坯以连轧速度0.6-0.8 m/s,开轧温度950 ~ 1 028弋控轧的低碳Nb-V微 合金化CB890QL钢进行组织分析,得出试验钢种在轧制过程中以动态回复为主;在0.8 m/s轧制速度下,进连轧温 度从1028°C降至950°C 钢的晶粒不断细化, Φ200 mm钢也存在晶粒尺寸差异较大的情况;0. 6 m/s的轧制速度 下,随着温度的降低晶粒大小并不是线性变化的。在进连轧温度为980°C ,0. 6 m/s轧制速度下,试验钢可获得较为细小均匀的组织。 相似文献
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Mehdi Mahmoudiniya Shahram Kheirandish Mohsen Asadiasadabad 《Transactions of the Indian Institute of Metals》2017,70(5):1251-1259
In the present study the effect of room temperature rolling on microstructure and mechanical properties of a new Cr–Mn austenitic stainless steel (containing 12 %Cr, 23 %Mn and 0.13 %C) and AISI 316 steel was investigated. The specimens of these steels were cold rolled at various thickness reductions of 0, 12, 25, 37 and 50 %. Microstructural investigations were carried out using optical microscopy, magnetic field test and X-ray diffraction technique. Hardness and tensile test methods were also done to evaluate the mechanical properties. Results showed that some of austenite phase transformed to martensite during cold rolling in the 316 steel, while there was no strain induced transformation in the Cr–Mn steel. It was also found that the newly developed steel had higher strength and higher specific strength than those of the 316 steel, while its ductility was the same as that of the 316. 相似文献
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研究了终轧温度(880~935℃)对热轧中碳含硼钢40B实际晶粒度的影响。在开轧温度990~1010℃的情况下,通过控制圆钢轧制节奏,实现不同的终轧温度,得出终轧温度降低有利于改善Φ32mm热轧中碳含硼钢的实际晶粒度。通过试验生产实践,并分析圆钢头、中、尾部1/2半径区域的纵向金相组织,发现当终轧温度在880~890℃时,热轧中碳含硼钢40B的实际晶粒度最细小且均匀。 相似文献
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《钢铁冶炼》2013,40(5):349-352
AbstractHot rolling of medium carbon steel bars using a prototype mill and numerical analyses were carried out to examine quantitatively the effect of temperature and strain throughout rolling on the final grain size of the product. Cross-sections of the rolled bars were subjected to optical microscopy to investigate the effect of the instantaneous decrease in temperature owing to contact with the roll groove on grain coarsening in the vicinity of the bar surface. By analysing the grain size after rolling, the temperature history throughout rolling, and the equivalent plastic strain after rolling, it was found that the instantaneous decrease in temperature owing to contact did not affect grain coarsening unless the final values of the temperature and strain fell within a narrow band of values meeting the criteria for grain coarsening. Referring to both the present results and the authors' previous studies, criteria have been established for the prevention of grain coarsening in steel bar sizing operations. 相似文献
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轧制条件对冷轧无取向硅钢织构的影响 总被引:7,自引:4,他引:3
除钢质的纯净度、夹杂物聚集程度、再结晶组织外 ,织构分布和各组分强度对冷轧无取向硅钢的磁性能 磁感应强度和铁损亦具有显著的影响。从基础理论方面讨论了冷轧无取向硅钢的热轧、终轧温度和层流冷却条件对轧件织构形成的影响及冷轧压下率和冷轧轧制形状参数对其再结晶织构的影响. 相似文献
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For the purpose of achieving the reasonable rolling technology of 780 MPa hot‐rolled Nb‐Ti combined ultra‐high strength steel, the effect of deformation and microalloy elements Nb and Ti on phase transformation behaviors was investigated by thermal simulation experiment. The results indicated: the deformation promoted ferritic transformation; due to the carbon content of the experimental steel was lower (<0.12% wt), the deformation indirectly impacted perlitic transformation through promoting ferritic transformation; the effect of the deformation on bainitic transformation was subject to condition whether proeutectoid ferrite precipitated before bainitic transformation. At low cooling rate of 0.5 °C/s, Nb and Ti promote transformation process γ → α, but that not good for refining the ferrite grain; at high cooling rate of 25 °C/s, Nb and Ti to a certain extent promote bainitic transformation. The recrystallization stop temperature of experimental steel was greater than 1000 °C, and phase transformation point Ar3 was 764 °C. In order to obtain the fully bainite microstructure in the practical rolling process, the cooling rate should be controlled above 15 °C/s, the start finish rolling temperature between 950–980 °C, the finishing temperature between 830–850 °C, the coiling temperature between 450–550 °C. 相似文献
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