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轿车减振器盖用钢板的双相处理工艺研究 总被引:1,自引:0,他引:1
本文试验研究了10#钢板的双相处理工艺、组织和性能,结果表明在(α+γ)两相区不同温度加热淬火处理获得了不同(F+M)比例的双相钢钢板,其力学性能可通过调整双相处理及回火工艺来调节,用10#双相钢钢板试制成了轿车底盘零件——减振器盖。 相似文献
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Simple Heat Treatment for Production of Hot-Dip Galvanized Dual Phase Steel Using Si-Al Steels 总被引:1,自引:0,他引:1
F. Equihua-Guillén A. M. García-Lara C. R. Muñíz-Valdes J. C. Ortíz-Cuellar J. E. Camporredondo-Saucedo 《Journal of Materials Engineering and Performance》2014,23(1):268-274
This work presents relevant metallurgical considerations to produce galvanized dual phase steels from low cost aluminum-silicon steels which are produced by continuous strip processing. Two steels with different contents of Si and Al were austenized in the two-phase field ferrite + austenite (α + γ) in a fast manner to obtain dual phase steels, suitable for hot-dip galvanizing process, under typical parameters of continuous annealing processing line. Tensile dual phase properties were obtained from specimens cooled from temperature below Ar3, held during 3 min, intermediate cooling at temperature above Ar1 and quenching in Zn bath at 465 °C. The results have shown typical microstructure and tensile properties of galvanized dual phase steels. Finally, the synergistic effect of aluminum, silicon, and residual chromium on martensite start temperature (M s), critical cooling rate (C R), volume fraction of martensite, and tensile properties has been studied. 相似文献
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采用Gleeble-3500热模拟试验机、拉伸试验机和光学显微镜研究了连续退火工艺中均热温度、缓冷温度和过时效温度对980 MPa级复相钢力学性能及组织的影响规律。结果表明,经连续退火处理后980 MPa级复相钢组织为典型的铁素体、贝氏体、马氏体组织,随均热温度的提高,贝氏体和马氏体含量逐渐增加,从而提高抗拉强度和规定塑性延伸强度;缓冷温度则能改变新生铁素体晶粒大小及马氏体含量,从而调控复相钢力学性能;随着过时效温度的升高,部分颗粒状碳化物开始析出,能够降低马氏体的强度即改善复相钢塑性。从多元调控的角度逐步优化980 MPa级复相钢的综合力学性能,最终确定均热温度800 ℃、缓冷温度700 ℃和过时效温度340 ℃为最优工艺参数。 相似文献
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The ultrafine grained ferritic steels possess high strength but low ductility due to the shortage of work hardening.Fine grained ferrite-martensite dual phase microstructure was obtained in a microalloyed steel and low carbon steels through intercritical annealing of the cold rolled martensite.The dual phase microstructure was uniform and the ferrite grain size was smaller in the microalloyed steel resulted from the pinning effect of microalloyed precipitates.But ferrite grown apparently and the volume fraction of the martensite was much higher without the addition of microalloying elements.By introducing martensite into the fine grained ferrite,the work hardening was effectively improved,leading to better mechanical stability.As a result of the fine ferrite grain size as well as uniform distribution of the martensite,the work hardening was enhanced,showing better strength-ductility balance in the microalloyed dual phase steel. 相似文献
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对含Nb与不含Nb的Cr-Ni-Mo-V系高强钢进行880℃×1 h淬火+300℃×3 h回火处理,并采用SEM、EBSD、TEM和物理化学相分析等技术分别对其微观组织和析出相进行观察分析。结果表明,添加了0.035%Nb的试验钢组织得到细化,马氏体板条块尺寸从3.1μm下降至2.9μm,且Nb的添加使得MC型析出相的含量增加,析出相尺寸分布得到优化,尺寸在18~200 nm的析出相含量明显增加。由于析出相含量的增加,固溶C含量有所下降,加之含Nb试验钢中的原始C含量稍低,导致含Nb钢的强度稍有下降,但仍达到2000 MPa水平。而马氏体组织的细化及析出相尺寸分布的优化使含Nb试验钢韧性明显提升,室温和-40℃低温冲击吸收能量(KU2)均提高至44 J。 相似文献
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采用两种热处理工艺制度,得到不同基体组织的800 MPa级双相钢,并系统地研究了基体微观组织特征及其对强塑性机制的影响。结果表明,基体组织对800 MPa级双相钢的塑性变形机制有显著影响,从而导致性能产生差异。(F+M)双相钢由多边形铁素体和约28%的第二相马氏体组成,屈强比0.540,而伸长率达到23.3%;(BF+γ)双相钢由贝氏体铁素体基体组织和约24%的第二相残留奥氏体组成,其屈强比为0.702,同时扩孔率达到56%。(BF+γ)双相钢在塑性变形过程中,厚度约为60~150 nm的γ相可有效分解裂纹尖端的应力集中,消耗裂纹扩展能量,同时诱导残留γ发生马氏体相变引起的体积膨胀还可弥合微裂纹产生的缝隙,在α相BF和残留γ两相的协调变形机制作用下,有益于提高其强度、塑性和扩孔性能。此外,(BF+γ)双相钢大角度晶界所占比例增加至63.1%,同时基体中存在较高的位错密度,均可有效弱化微裂纹扩展的驱动能,增加其继续扩展所需能量,缓解其在变形或扩孔过程中产生的应力集中。 相似文献