共查询到20条相似文献,搜索用时 106 毫秒
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采用氮气炉加热模拟薄板坯连铸连轧生产线罩式退火工艺,研究了不含B与含适量B的含磷高强IF钢210P1冷轧板再结晶规律;采用X射线衍射仪对不同B含量的罩式退火成品板进行了织构分析;对成品板的显微组织进行了观察并对现场生产的不同B含量钢板的r90值进行了统计。结果表明:将B含量控制在0.0005%~0.0007%时,冷轧钢板罩式退火再结晶温度与不含B的冷轧钢板基本相同,甚至再结晶更充分些,而且加适量的B可解决含磷IF钢二次加工脆性问题,成品板具有较高强度的有利织构{111}110和{111}112、较高的{111}/{100}比值以及较高的成形性能指标r90值,成品板的饼形晶粒更大。当B含量超过0.0009%时,再结晶晶粒较小且不均匀,有利织构较弱,塑性应变比r_(90)值较低。 相似文献
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通过对轧制态的含磷Nb-Ti高强IF钢冷轧硬卷进行750~870℃退火试验,在Instron5569拉伸试验机上测试计算了塑性应变比r值和平面各向异性指数Δr,并对不同退火温度下的试样进行了ODF分析。结果表明,退火温度从750℃升高到870℃,试验钢的r0、r45、r90和珋r均随温度的升高而增大;平面各向异性随退火温度的升高而降低。结合显微组织分析,810~840℃退火时,试验钢获得最佳综合性能。试验钢从冷轧态到完全再结晶,{001}<110>、{110}<110>织构强度降低,{112}<110>织构遗传成为最强织构,而{111}<110>织构比{111}<112>织构强,使Δr值为负值;最佳退火温度(810~840℃)条件下最大珋r值为1.65,Δr为-0.38。 相似文献
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研究了冷轧高强IF钢在810 ℃退火保温不同时间下的组织及织构,以及加入稀土对高强IF钢组织及织构的影响。结果表明,
高强IF钢810 ℃退火时,保温时间低于15 s时再结晶已经开始;加稀土的试样,保温45 s与60 s时,{111}<112>织构均比{111}<110>织构强,但60 s时的{111}面织构均匀性较好。由于稀土的加入,退火后高强IF钢的铁素体晶粒得到细化,硬度升高,且造成较强的α纤维织构与较弱的γ纤维织构,减缓了变形织构强度降低的速率,延迟了再结晶过程;同时{111}面织构的均匀性变差。 相似文献
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针对不同的连续退火温度,研究了其对高强IF钢的组织、织构及力学性能的影响。结果表明:当连续退火温度为760℃时,退火板再结晶不完全,屈服强度较高,伸长率较低,应变硬化指数n值和塑性应变比r值较低,{111}织构较弱;随着退火温度的升高,拉长晶粒完全消失,退火板晶粒尺寸增大且均匀性增强,屈服强度降低,伸长率、n值和r值上升。退火温度在790℃以上时,退火板织构以γ织构为主;随着退火温度继续升高,退火板γ织构中{111}110和{111}112取向强度差减小,各向同性增强。升高连续退火温度有利于提高高强IF钢的组织均匀性、成形性能以及深冲性能。 相似文献
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《Scripta materialia》2002,46(1):7-12
The paper presents results of thermodynamic analysis of phosphorus grain boundary segregation in 17Cr12Ni austenitic steel annealed for 1000 h at 923, 973 and 1073 K. With respect to values of compensation temperature τP=930 K and segregation enthalpy ΔHP0=−14.1 kJ/mol the analyzed interfaces were considered to be special grain boundaries. 相似文献
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B. S. Bokshtein A. N. Khodan O. O. Zabusov D. A. Mal’tsev B. A. Gurovich 《The Physics of Metals and Metallography》2014,115(2):146-156
In a temperature range of 280–320°C, the mechanism and kinetics of segregation of impurities in steels have yet remained insufficiently studied. Under these conditions diffusion of impurities in the bulk of steel grains practically ceases, and for describing the kinetics of the process it is incorrect to use the Langmuir-McLean equation. In this work we put forward two new approaches to describe the mechanism and kinetics of phosphorus segregation in steels: a model of sequential changes in the state of phosphorus based on first-order reactions and a model of diffusion redistribution of phosphorus between boundaries of carbide precipitates, structure defects, and boundaries of steel grains. A comparative analysis of the suggested models has been conducted, and estimates of the kinetics of segregation based on them have been made; these estimates have been compared with the experimental results obtained in the temperature range of 280–320°C for test times to ~20 years. It has been shown that these models fairly well describe the experimental kinetics of phosphorus segregation in boundaries of steel grains. 相似文献
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《Scripta materialia》2003,48(9):1343-1347
Temper cold rolled silicon steel samples were annealed with and without an applied magnetic field. The final grain size was the same for both annealing conditions. Application of a magnetic field affected texture development by increasing the strength of the Goss component and decreasing the intensity of the gamma fiber. 相似文献