共查询到20条相似文献,搜索用时 46 毫秒
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采用Gleeble 1500热模拟实验机对F40MnV非调质钢在温度为950 ~1250℃、应变速率为0.1~ 10 s-1范围内进行了等温、等应变速率热压缩实验.依据实验的流动应力曲线,将材料参数表示为应变的函数,采用双曲正弦形式的Arrhenius方程建立了该种钢的高温本构模型.统计计算了模型预测流动应力和实验值之间的相关系数和平均相对误差分别为0.993和5.56%.结果表明:在实验温度和应变速率范围内,双曲正弦形式Arrhenius方程中材料参数可以表示为应变的多项式函数,该方程能够较为准确预测材料高温流动应力随变形量增加而变化的大小和趋势,适用于该种钢热锻造过程的数值模拟. 相似文献
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35MnVS非调质钢连杆应用研究 总被引:1,自引:0,他引:1
通过对非调质钢35MnVS和调质钢55钢在生产轿车连杆进行的金相组织、结构、性能等方面的对比,说明用35MnVS生产汽车连杆具有较好的性能和经济效益。 相似文献
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采用电弧喷涂工艺在汽车曲轴用48MnV钢表面制备了厚度不同的3Cr13涂层,通过拉伸实验和疲劳实验研究其力学性能和高周疲劳行为。结果表明,相比48MnV基体,涂层试样的屈服强度、抗拉强度和疲劳极限均明显下降,且涂层越厚,降幅越大。 相似文献
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非调质钢柴油机连杆的开发应用 总被引:1,自引:0,他引:1
介绍了3种非调质钢连杆与调质钢连杆的显微组织,力学和疲劳性能对比试验。依据对比试验结果选定35MnVS钢为柴油机连杆用材。验证了材料的可靠性和耐久性后,逐步扩大了生产批量,取得了显著的经济效益。 相似文献
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不同氧含量非调质钢的高周疲劳性能 总被引:1,自引:0,他引:1
采用旋转弯曲疲劳试验对比研究了两种不同氧含量(0.0018%和低于0.001%)中碳微合金非调质钢F45MnV在不同状态(正火、调质和锻造)下的高周疲劳性能。结果表明,在具有均一回火索氏体组织的调质态,低氧料F45MnV-1的疲劳性能优于高氧料F45MnV-2;在具有类似铁素体+珠光体组织的正火态,两种料的高周疲劳性能和疲劳裂纹扩展速率基本一致;锻态F45MnV-1料由于具有细小、均匀的铁素体+珠光体组织,其高周疲劳性能优于正火态F45MnV-1料,而与调质态F45MnV-1接近。对于铁素体+珠光体组织和均匀调质组织,非金属夹杂物对疲劳破坏行为的不同影响是上述试验钢疲劳性能差异的主要原因。此外,两种试验钢的铁素体+珠光体组织的裂纹扩展速率均略低于调质态组织。 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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研究了电工钢SXRC的显微结构和疲劳性能,并与DP钢进行了比较。结果表明,退火温度低温化能够有效的抑制电工钢的再结晶。该钢在固溶铌的作用下,能够在保证电机磁性的同时具有一定的强度。与DP钢相比,SXRC钢的抗疲劳性能更好。 相似文献
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TRIP800钢板疲劳性能研究 总被引:1,自引:0,他引:1
对厚度为1.8mm的国产TRIP800 MPa钢板进行疲劳试验,并运用最小二乘法对试验数据进行拟合,获得了在对称循环应力下的疲劳经验公式.结果表明:TRIP800 MPa钢板在加载频率为8Hz、R=0的条件下疲劳极限是560MPa;TRIP800钢板的疲劳裂纹源位于表面下的夹杂物处,裂纹扩展区为韧性断裂,瞬断区为脆性断裂. 相似文献
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M. Hajisafari S. Nategh H. Yoozbashizadeh A. Ekrami 《Journal of Materials Engineering and Performance》2013,22(3):830-839
In the present study, 30MSV6 microalloyed steel was heat treated under different conditions, and the relation between its microstructure and mechanical properties was investigated. Scanning electron microscopy and transmission electron microscopy were used to characterize the microstructure of the heat-treated steel, and the effect of microstructure on tensile strength and fatigue behavior was determined. Microstructural analysis indicated that precipitates were formed at different sites such as grain boundaries and sub-grain boundaries. Furthermore, microstructural studies accompanied by the evaluation of mechanical properties revealed that the optimal heat treatment cycle of 30MSV6 microalloyed steel involved austenitization at 1223 K for 1 h and cooling in air to room temperature, followed by aging at 873 K for 1.5 h. The optimal heat treatment cycle resulted in significant improvement in the fatigue strength, tensile strength, and ductility because of the development of a uniform distribution of fine precipitates in a refined microstructure. The fatigue limit under optimum conditions (~384 MPa) was greater than that under other conditions (~321 and 312 MPa). 相似文献
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以汽车油箱9Ni钢焊接接头为对象,研究不同热输入条件下焊接接头的微观组织和性能。结果表明,热输入为16 k J/cm时,9Ni钢焊接接头的枝晶偏析较弱,热输入为12 k J/cm时,接头的整体硬度值最大,冲击性能达标。 相似文献
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C. P. Mulligan G. N. Vigilante J. J. Cannon 《Journal of Materials Engineering and Performance》2017,26(11):5228-5236
High and low cycle fatigue tests were conducted on high-strength steel using four-point bending. The materials tested were ASTM A723 steel in the as-machined condition, grit-blasted condition, MIL-DTL-16232 heavy manganese phosphate-coated condition, and ASTM A1059 Zn-alloy thermo-diffusion coated (Zn-TDC). The ASTM A723 steel base material exhibits a yield strength of ~1000 MPa. The effects of the surface treatments versus uncoated steel were examined. The fatigue life of the Zn-TDC specimens was generally reduced on as-coated specimens versus uncoated or phosphate-coated specimens. Several mechanisms are examined including the role of compressive residual stress relief with the Zn-TDC process as well as fatigue crack initiation from the hardened Zn-Fe alloy surface layer produced in the gas-metal reaction. Additionally, the effects of corrosion pitting on the fatigue life of coated specimens are explored as the Zn-TDC specimens exhibit significantly improved corrosion resistance over phosphate-coated and oiled specimens. 相似文献