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本文综述了国内外非调质钢发展现状以及其在汽车连杆上的应用;探讨了物理冶金因素和热加工因素对非调质钢强韧化的影响;指明了旨在控制先共析铁素体组织参数和沉淀硬化效应的控锻控冷新技术。为稳定汽车连杆用非调质钢性能,推动其规模化生产应用,开拓了新的前景。 相似文献
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汽车连杆用非调质钢及其控锻控冷技术 总被引:7,自引:0,他引:7
本文综述了国内外非调质钢发展现状以及其在汽车连杆上的应用,探讨了物理冶金因素和热加工因素对非调质钢强韧性的影响;指明了旨在控制先共析铁素体组织参数和沉淀硬化效应的控锻控冷新技术,为稳定汽车连杆用非调质钢性能,推动其规模化应用,开拓了新的前景。 相似文献
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研究了不同的控轧工艺参数对非调质钢组织结构的影响规律,并在非调质钢零件不同部位采用强化控冷技术进行锻后冷却,得到了优化的非调质钢控轧控冷技术。结果表明:非调质钢转向节零件局部强化控冷技术能显著提高零件局部的综合力学性能;在1273~1373 K下,随着应变量ε在0.22~1.61内增加,实验钢原奥氏体晶粒从26~12μm逐渐细化,在该条件下峰值应变约为0.3;在1173~1473 K范围内随着变形温度的降低,变形抗力增大,峰值应变也随之增大,材料原奥氏体晶粒尺寸在20~11μm内逐渐减小;在增大锻压比和局部风冷两种工艺配合下,F40MnV钢可获得较好的综合力学性能。 相似文献
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铁素体—珠光体型非调质钢及其控锻控冷技术 总被引:4,自引:1,他引:4
综述了国内外铁素体-珠光体型非调质钢发展现状,探讨了锻造温度、锻造变形量、变形速率及锻后冷却速度对非调质钢强韧化的影响,指出了旨在控制先共析铁素体组织参数和沉淀硬化效应的控锻控冷新技术。为稳定锻造用铁素体-珠光体型非调质钢性能,推动其规模化生产应用,开拓了前景。 相似文献
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浅谈我国微合金非调质油井管的发展 总被引:7,自引:3,他引:7
简述了微合金非调质钢的发展过程,介绍了我国微合金非调质油井管的研究成果,指出了用于生产N80级油井管的微合金非调质钢的化学成分控制范围和通过控轧控冷工艺应获得的管材金相组织。 相似文献
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《International Heat Treatment & Surface Engineering》2013,7(4):166-170
AbstractWithin the scope of a research project in cooperation with steelmakers and steel users, the whole production process chain of gear parts was investigated concerning the influence on the grain size stability. Three different case hardening steels were investigated in a basic and a microalloyed state. This paper discusses the results gained with a case hardening steel with a new alloying concept, called 20CrMo5. The grain size stabilities of four different industrially produced states of the microalloyed material are compared to the standard material produced in a standard production chain. As a result, it emerged that additional annealing treatments above the eutectoid temperature within the production process chain reduce the grain stability of microalloyed steels. 相似文献
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薄板坯连铸结晶器技术及钢种开发的几个问题分析(续) 总被引:1,自引:0,他引:1
薄板坯连铸结晶器是薄板坯连铸技术的核心,通过对薄板坯连铸结晶器内钢水的流动、传热以及凝固壳的收缩和变形行为的研究,分析了连铸坯几种典型裂纹缺陷的形成原因;并结合实验室和生产实践,对薄板坯连铸连轧生产冷轧基料用B微合金化钢、电工钢、V-N微合金高强度钢等的工艺特性以及钢材性能进行了分析。文章分二次发表,本次是上海金属2006—1期文章的续栽,内容是关于薄板坯连铸连轧典型品种的开发以及薄板坯连铸连轧技术的发展与展望。 相似文献
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薄板坯连铸结晶器技术及钢种开发的几个问题分析 总被引:3,自引:0,他引:3
薄板坯连铸结晶器是薄板坯连铸技术的核心,通过对薄板坯连铸结晶器内钢水的流动、传热以及凝固壳的收缩和变形行为的研究,分析了连铸坯几种典型裂纹缺陷的形成原因;并结合实验室和生产实践,对薄板坯连铸连轧生产冷轧基料用B微合金化钢、电工钢、V—N微合金高强度钢等的工艺特性以及钢材性能进行了分析。文章分二次发表,本次发表的内容是关于薄板坯连铸结晶器的相关技术及板坯典型裂纹的分析。 相似文献
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采用V-N微合金化工艺,开发出了屈服强度490 MPa以上的高强门架型钢。针对生产过程中出现的冲击性能不合,采用V-Ti微合金化工艺后,冲击性能明显提升,最高达到102 J,原因是Ti的细化晶粒作用,但屈服强度有所降低,是因为TiN的生成减弱了V-N的强化作用。生产过程中在型钢翼缘尖部出现裂纹,在生产工艺基本不变的条件下,分析产生的原因是钢中N元素含量高,N与V和Ti等元素形成氮化物在晶界析出促进了方坯横裂纹的发生,采用V-Fe合金代替部分V-N合金后,有效消除了翼缘裂纹的产生。 相似文献
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Microalloyed steels today represent a significant part of total world production and processing of steel. Although widely used, there are scarce data on the stress distribution in the deformation zone of these steels. Research was carried out on two steel grades, both low-carbon structural steels with the same basic chemical composition, with one of them additionally microalloyed with niobium. Differences in the stress distribution in the deformation zone between two tested steels were continuously observed and measured using the methods of digital image correlation and thermography. It has been found out that niobium microalloyed steel has significantly more complex material flow and stress distribution in the deformation zone when compared to the plain low carbon steel. 相似文献
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微合金化近终型异形坯在生产过程中,异形坯的R角附近极容易发生纵裂纹缺陷,严重制约铸坯合格率的进一步提升。通过对断面特点和钢种特性进行分析,对钢包和中间保护浇注效果进行改善提升,同时对冷却制度重新设计,针对性地优化了保护渣理化性能,有效解决了微合金化近终型异形坯R角纵裂纹的问题,同时也明确了微合金化异形坯R角裂纹的产生并不是单一因素作用的结果,需要结合实际钢种和断面特点提出针对性的解决措施。 相似文献
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Atul Saxena Vinod Kumar Ramen Datta 《Journal of Materials Engineering and Performance》2011,20(8):1481-1483
Dilation study was carried out in a thermo-mechanical simulator to understand the phase transformation behavior of a 0.15%
vanadium microalloyed steel at three different cooling rates, i.e., 2, 5, and 10 °C/s. Results of the study showed that the
phase transformation temperatures, namely Ar3, Ar1, and Bs of 0.15% vanadium microalloyed steel increased with increase in the cooling rate from 2 to 10 °C/s. It was also observed
that a cooling rate of 5 °C/s was sufficient to form bainite microstructure in the plates while both bainite and martensite
were formed when cooling rate was increased to 10 °C/s. The findings of dilation study were used to design a rolling programme
for commercial production of high strength steel plates of 0.15% vanadium steel chemistry. 相似文献
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Zhaodong Li Qilong Yong Zhengyan Zhang Xinjun Sun Jianchun Cao Haiquan Qi Zhi Liao 《Metals and Materials International》2014,20(5):801-806
Effects of microalloyed niobium (Nb) on the austenite decomposition behaviors and microstructure evolution during continuous cooling in the near eutectoid steels were investigated. Compared to the Nb free steel, the Nb microalloyed steel was refined with regard to polygonal ferrite grain, pearlite block and colony sizes. This was because its austenite grain size was smaller. The volume fraction of polygonal ferrite transformed was more in the Nb microalloyed steels, which indicated the eutectoid carbon content exceeded that of pure carbon steel. The spheroidization of pearlite during continuous cooling was enhanced by Nb microalloying, mainly due to a higher critical transformation temperature and the finer pearlite structure with smaller colony size and narrower interlamellar spacing. Hot deformation right above the equilibrium eutectoid temperature accelerated the spheroidization kinetics of pearlite, especially in the Nb microalloyed steel. 相似文献
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The kinetics of dynamic precipitation in austenite of a complex Nb-Ti-V microalloyed steel during hot compression at 900 °C with a strain rate of 6.7 s?1 was quantitatively investigated through electrical resistivity measurements. The dynamic precipitation in the Nb-Ti-V microalloyed steel started at a strain of 0.15. The amount of tiny Nb-rich (Nb,Ti,V)C carbides, which were precipitated at crystal defects gradually increased up to 0.02 wt% at a maximum strain of 0.67. The electrical resistivity was successfully applied to the quantitative evaluation of dynamic precipitation kinetics in microalloyed steel by excluding the effects of crystal defects and interstitial atoms on the electrical resistivity. 相似文献