【摘 要】
：
Ultra-fast cooling(UFC)has been increasingly applied in industry,but accompanying with great changes of rolling strategy.It is therefore of importance to ev
【机 构】
：
The State Key Laboratory of Rolling and Automation,Northeastern University,3-11 Wenhua Road,Shenyang
论文部分内容阅读
Ultra-fast cooling(UFC)has been increasingly applied in industry,but accompanying with great changes of rolling strategy.It is therefore of importance to evaluate the characteristics of steels produced by UFC as compared to those processed by conventional accelerated cooling(ACC).The present study examines the microstructure through thickness and centerline segregation of solute elements between UFC and ACC steels,both of which were rolled at a final rolling temperature at around non-recrystallized temperature.UFC steel showed the pronounced microstructural transition from lath-type bainite with Widmanst(a)tten ferrite at subsurface to acicular ferrite in an average size of~5μm dispersed with degenerate pearlite in the interior.In contrast,ACC steel had the homogeneous microstructure through the thickness,which was distinguished with coarser polygonal ferrite grains and pearlite nodules.Moreover,the centerline segregation was significantly suppressed by applying UFC at a higher cooling rate of 40 K/s compared to 17K/s for ACC steel.The significant differences in the microstructure and centerline segregation caused by various cooling rate is discussed from the view of γ→α transformation.
其他文献
黄花三宝木(Trigonostemon lutescens Y.T.Chang et J.Y.Liang)是广西特有的三宝木属(Trigonostemon genus)植物。三宝木属植物是我国和泰国常用的民间药,现代研究表明,三宝木属植物含有二萜类、生物碱类、香豆素类等活性化合物,具有细胞毒活性、抗病毒活性、抗虫和抑菌等药理活性,是一种具有很大开发潜力的药用植物资源。目前对于黄花三宝木化学成分的研
A survey is given on the various reasons for microallying of engineering steels.In case hardening steels microalloying improves toughness and fatigue proper
Mn-Mo-Ni low-alloy steels are widely used in the manufacture of nuclear pressure vessels.This article studied the influence of carbon content and cooling ra
请下载后查看，本文暂不支持在线获取查看简介。
Please download to view, this article does not support online access to view profile.
低地球轨道环境中的原子氧(AO)具有强氧化性,其高能碰撞会导致聚合物材料性能退化,严重影响航天器的正常工作。本文借助溶胶-凝胶(Sol-gel)法和湿化学改性法在聚酰亚胺薄膜(Kapton)和硅橡胶(SR)表面制备无机氧化物涂层,通过AO模拟试验评价其防护效果。同时研究了聚合物基体表面改性的微观变化、涂层与基体的界面结合状态等问题。主要研究工作如下:1.SiO_2溶胶体系研究:为制备适宜镀膜的溶胶
本刊讯9月26日下午,佳士得全球首席执行官施俊安,亚洲和欧洲区主席高逸龙、亚洲区总裁魏蔚、中国区主席蔡金青、中国区董事总经理刘珺一行人前来中拍协拜会。中国拍卖行业协
Two major drivers for the use of newer steels in the automotive industry is fuel efficiency and increased safety performance.Fuel efficiency is mainly a fun
随着建筑节能的大力推广和近几年国内重大火灾事故的不断发生,酚醛泡沫作为一种最重要的阻燃保温节能材料有望于取代易燃保温材料聚氨酯泡沫、聚苯乙烯泡沫等。酚醛泡沫是一种新型阻燃保温材料,它具有耐热、耐酸腐蚀、阻燃性优异、低烟无毒等特点。但传统的苯酚和甲醛所制得的酚醛泡沫,脆性大,掉渣现象较为严重。本论文用带有柔韧性链的腰果酚部分替代苯酚合成树脂改善了酚醛泡沫的脆性,达到泡沫增韧的效果。论文研究内容如下：
硫脲衍生物具有较强的配位性质,是一类优良的金属螯合剂和浮选捕收剂。本文在国家自然基金和“863"项目支持下,设计出一类新型硫脲类化合物——3,3-二烷氧丙基-1,1-一缩二乙二醇二羰基双硫脲(DAOPECTU)。研究了该类新型酯基硫脲的合成方法,确定了其优选合成工艺,考察了该酯基硫脲与金属离子的作用及其在矿物表面的吸附行为,并探讨了它们对硫化矿物的浮选性能。以一缩二乙二醇双氯甲酸酯与NaSCN为原
Utilizing high resolution transmission electron microscopy(HRTEM)and X-ray diffraction(XRD),chemical composition characteristics and thermal stability of re