固溶温度对00Cr25ND5AlTi合金冷轧板组织及力学性能和耐蚀性的影响

研究了00Cr25Ni35AlTi合金冷轧板900～1150℃固溶处理后的组织以及室温和350 ℃时的力学性能.并用电化学动电位再活化法测定了该合金的晶间腐蚀敏感性.结果表明,随着固溶温度的升高,该合金的晶粒尺寸逐渐增大,强度降低,塑性提高,晶间腐蚀敏感性也增加.在1 000℃固溶时,合金可获得均匀细小的奥氏体晶粒,晶粒度≥9级,且具有良好的力学和耐晶间腐蚀性能.     

一种高Nb-IF冷轧薄板钢的组织性能及织构

 采用拉伸试验、金相、ODF织构分析及电子背散射衍射(EBSD)技术研究了一种冷轧高Nb-IF钢和传统Nb+Ti-IF钢在不同退火温度下的组织性能、织构及晶界特征。结果表明：与传统Nb+Ti-IF钢相比,该新型高Nb-IF钢由于添加了质量分数为60×10-6的碳和010%的铌,其再结晶温度和再结晶完成温度均大幅度提高;新型高Nb-IF钢具有晶粒细小、组织均匀性良好的组织和γ取向织构发展充分且强点密度高的织构,能够获得强度高、伸长率高和r值高的优异的综合性能。EBSD分析结果表明,该新型高Nb-IF钢中小角度晶界和低指数重位点阵(ΣCSL)晶界含量较多,这也是试验钢获得优良成形性能的原因之一。     

固溶处理温度对冷轧Inconel 601镍基合金管材组织及性能的影响

通过金相显微镜、扫描电子显微镜、力学试验和腐蚀试验等研究了960～1040℃固溶温度对冷轧Inconel 601合金管材微观组织和性能的影响。固溶温度从960℃升高到1040℃时，合金管再结晶晶粒尺寸逐渐长大，长大速率先慢后快，这主要与析出相的溶解和元素活度有关。此温度范围内，保温15 min的晶粒长大激活能为393.08 kJ/mol,且合金的拉伸性能与晶粒尺寸之间的关系满足Hall-Petch关系式。固溶温度约在1020℃时，硬度曲线与延伸率曲线出现交点，此时的腐蚀速率也较低且稳定。1020℃保温15 min为Inconel 601合金Φ159.2 mm×5.1 mm管的最优固溶处理工艺。     

汽车用冷轧超低碳烘烤硬化钢板的组织性能与析出

实验研究了汽车用冷轧超低碳烘烤硬化钢板的成分、热轧冷轧及退火工艺对钢组织性能的影响规律,并分析了冷轧后连续退火和罩式退火不同条件下钢中析出第2相粒子形态和钢板的织构变化。     

Effects of Coiling Temperature on Strength,Yield Ratio and Precipitation Behaviors of Hot Rolled High Strength Microalloyed Steel for Cold Forming

Various hot rolling schedules were applied to a Nb,V,Ti contained HSLA steel.Coiling temperature had crucial effects on not only yield strength,but also yield ratio and precipitation behavior.600Mpa yield strength is achieved when coiled at 450℃,which is 100Mpa higher than those coiled at 570℃.However,the low coiling temperature had adverse effect to increase yield ratio,which increased from 0.78 to 0.88 as coiling temperature dropped from 570℃ to 450℃.High resolution SEM analysis shows that sizes of Nb,V,Ti precipitates are affected by coiling temperature.Coarse (Nb,Ti)(C,N) precipitates up to 5μm are observed at higher coiling temperature and to decrease tensile strength,where high coiling temperature corresponds to low cooling rate.With strong cooling and coiling capacity of Shasteel’s 1450mm width hot rolling mill,these results indicate that strength and formability of the steel can be balanced when coiling temperature has been optimized.Alloying and microalloying costs can be reduced by efficiently utilizing the capacity of rolling mill.Alumina inclusions are found to act as nucleus for Nb,V,Ti precipitates,contributing to coarsening of precipitates.     

Strain-Rate Sensitivity,Tension-Compression Asymmetry,r-Ratio,Twinning, and Texture Evolution of a Rolled Magnesium Alloy Mg-1.3Zn-0.4Ca-0.4Mn

Metallurgical and Materials Transactions A - In this work, the deformation response, texture evolution, and twinning development of a magnesium (Mg) alloy, Mg-1.3Zn-0.4Ca-0.4Mn, for biocompatible...