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应用有限元对液压鼓胀试验进行模拟,通过SUS304材质的试样位移-载荷曲线的模拟值与试验值对比,验证有限元模型参数的准确性。考虑上夹持器在螺栓夹紧的同时发生微弱拱起,定义其几何模型由一段斜线和圆弧组成,并进行论证。提出了一种结合液压鼓胀试验和有限元两方面确定微试样材料性能的方法。对316L材料进行线性强化弹塑性模型简化,通过有限元分析计算得到的位移-载荷曲线逐步逼近试验位移-载荷曲线,反推出屈服强度和线性强化弹塑性模型的最优参数,并将其与相同材质相同厚度的材料拉伸试验得出的材料属性进行对比。 相似文献
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采用光学显微镜、拉伸试验、冲击试验及硬度试验研究了模拟焊后热处理对15Cr Mo钢组织和力学性能的影响。结果表明:经690℃模拟焊后热处理后,15Cr Mo钢的屈服极限、抗拉强度、高温强度、冲击吸收能量以及硬度均有升高的趋势,伸长率有所降低;随着保温时间的延长,屈服强度、抗拉强度、高温强度、冲击吸收能量、硬度以及伸长率均呈降低趋势。在690℃模拟焊后热处理保温不同时间后,15Cr Mo钢的显微组织均为回火贝氏体+铁素体,随着保温时间的延长,钢中铁素体数量逐渐增多,晶粒尺寸增大。 相似文献
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基于孔隙材料连续介质力学和塑性变形理论,应用多孔材料椭球屈服Shima粘塑性本构模型,采用非线性分析软件MSC.MARC实现了Cu Cr25粉末HIP致密化过程有限元模拟。结果表明:压坯角落及端盖附近的相对密度较低,外侧靠近包套部分均匀性较差。热等静压保压压力小于130 MPa时,Cu Cr25压坯致密化速率、最终相对密度会随加压载荷的增加而提升;当保压压力大于130 MPa,Cu Cr25压坯相对密度基本不变。试验结果与模拟结果平均相对密度误差约为1.4%,表明有限元数值模拟准确预测了Cu Cr25粉末的致密化过程。 相似文献
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利用材料模拟软件JMatPro模拟了近百种不同合金成分的水轮机用材料在碳当量为0.48%的情况下的屈服强度和抗拉强度的变化情况。得到了在碳当量一定的情况下,不同的化学元素C、Mn、Mo、V、Cr、Si和微量元素B等对材料强度的影响规律,为水电产品锻件的生产制造提供了理论依据。 相似文献
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测定电机轴承支撑环预选材料 0Cr16Ni5Mo、A564Type630H1100静力学性能、室温水下疲劳极限、室温水下疲劳曲线,结果表明: A564Type630H1100材料的拉伸强度、硬度均高于 0Cr16Ni5Mo材料, 0Cr16Ni5Mo材料的冲击功大于 A564Type630H1100材料。循环 107周次 A564Type630H1100材料水下疲劳极限为 415MPa,0Cr16Ni5Mo材料水下疲劳极限为 434MPa,两种材料疲劳极限均满足支撑环材料疲劳强度要求(不小于 197MPa)。在低载荷区(不大于 500MPa)0Cr16Ni5Mo疲劳寿命高于 A564Type630H1100,在高载荷区(不小于 500MPa)0Cr16Ni5Mo疲劳寿命低于 A564Type630H1100。试验初步建立静力学性能与动力学性能体系,为其合理应用提供可靠数据。 相似文献
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采用低C低Si、Ni+Cr+Mo+Cu复合强化的理念设计了100 mm厚的S420高强钢,对钢板焊接前后的微观组织、力学性能和裂纹尖端张开位移CTOD进行了观察和测试。试验结果表明:经过900 ℃淬火+580 ℃回火后,钢板的综合性能达到最佳,屈服强度为478 MPa,抗拉强度为581 MPa,伸长率为28.4%;钢板焊后-40 ℃冲击性能优异,从焊缝至熔合线+5 mm处的过渡区内,心部冲击吸收能量稳定在100 J以上。CTOD性能检验结果显示,即使在性能最薄弱区域粗晶热影响区(CGHAZ),裂纹尖端张开位移(CTOD)值都高达1.59 mm。 相似文献
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采用拉伸试验、X射线衍射、光学显微镜和透射电镜等研究了一种13Cr超级马氏体不锈钢(00Cr13Ni6Mo2)的高温力学性能和高温时效后的力学性能、物相组成及显微组织。结果表明:00Cr13Ni6Mo2钢在高温下可保持较高的屈服强度,但当超过Af(奥氏体转变完成点)温度后,屈服强度迅速下降;600℃时效后,马氏体基体中的位错密度明显降低,同时产生了一定量的逆变奥氏体,导致时效100 h后其屈服强度从824 MPa降至682 MPa(下降17.2%),而抗拉强度和伸长率变化不大;800℃时效过程中,试验钢的组织完全奥氏体化,在降温过程中组织转变为淬火马氏体,故其具有典型的淬火马氏体性能特征,时效100 h后抗拉强度从858 MPa升至1031 MPa(提高20.2%),同时伸长率从22.5%降至15.0%。 相似文献
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1. IntroductionCr12MoV steel is used widely as an important high wear resistallt cold die steel aroundthe world[1]. It is well known that Cr12MoV steel has networked carbide in the solidification structure, which leads to the intergranular brittleness. Moreover. The networkcarbide is too stable to be changed during heat treatment even at high temperaturely]. Inthe conventional process, forging is needed to break etwork carbide into a granular form.However, partly owing to Cr12MoV steel hav… 相似文献
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采用OM、SEM、EDS、硬度测试、室温冲击及高温拉伸等方法研究了Co对4Cr5Mo2V钢的组织和强韧性的影响。结果表明:经1010 ℃淬火30 min,4Cr5Mo2V-Co钢未溶碳化物数量更多,马氏体板条更细;510~600 ℃回火时,4Cr5Mo2V-Co钢的回火硬度较4Cr5Mo2V钢高出1~2 HRC,但二者冲击性能相当;相同初始硬度条件下,4Cr5Mo2V-Co钢具有更高的高温强度,这是因为Co元素的添加促进了4Cr5Mo2V-Co钢二次硬化碳化物的形核速率,并能降低碳化物的粗化速率,从而提高了4Cr5Mo2V-Co钢的强度。 相似文献
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小冲孔试验技术(SPT)是测量在役构件材料力学性能的新方法。文章介绍了基于弹性能量理论预测材料屈服强度的小冲孔能量法,并对试验原理及步骤进行了详细阐述。在验证试验重复性的基础上,对Q345R进行小冲孔能量法试验,并与常规拉伸试验、小冲孔偏移法和双斜率法的结果进行对比。结果表明,能量法测试Q345R屈服强度的误差为5.52%,远小于双斜率法和偏移法试验结果的误差。在此基础上,根据有限元模拟,结合载荷-位移(L-D)曲线与能量-位移(E-D)曲线,分析了试样厚度、压球直径、下模孔径、冲压速度以及试样边缘减薄等因素对小冲孔能量法结果的影响。得出试样厚度0.5mm、压球直径2.4mm、下模孔径4mm为最佳几何尺寸搭配。 相似文献
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Correlation Between Shear Punch and Tensile Strength for Low-Carbon Steel and Stainless Steel Sheets
The deformation behavior of AISI 1015 low-carbon steel, and AISI 304 stainless steel sheets was investigated by uniaxial tension and the shear punch test (SPT). Both materials were cold rolled to an 80% thickness reduction and subsequently annealed in the temperature range 25-850 °C to produce a wide range of yield and ultimate strength levels. The correlations between shear punch and tensile yield and ultimate stresses were established empirically. Different linear relationships having different slopes and intercepts were found for the low-carbon and stainless steel sheets, and the possible parameters affecting the correlation were discussed. It was shown that, within limits, yield and tensile strength of thin steel sheets can be predicted from the shear data obtained by the easy-to-perform SPT. 相似文献
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Corrosion of Ni–Cr–Mo–V high strength steel at different hydrostatic pressures is investigated by scanning electron microscopy (SEM) and finite element analysis (FEA). The results indicate that corrosion pits of Ni–Cr–Mo–V high strength steel originate from inclusions in the steel and high hydrostatic pressures accelerate pit growth rate parallel to steel and the coalescence rate of neighbouring pits, which lead to the fast formation of uniform corrosion. Corrosion of Ni–Cr–Mo–V high strength steel under high hydrostatic pressure is the interaction result between electrochemical corrosion and elastic stress. 相似文献
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Mo对高强度钢延迟断裂行为的影响 总被引:4,自引:0,他引:4
在含V和Nb的40Cr钢中添加不同质量分数(0-1.54%)的Mo元素,采用缺口拉伸试样和改进的M—WOL型试样研究了Mo对高强度钢延迟断裂行为的影响.结果表明,随着Mo含量的增加,实验钢的延迟断裂抗力逐渐提高;当Mo含量超过1.15%时,延迟断裂抗力不再提高.EDS分析结果表明,钢中Mo元素在晶界发生偏聚,偏聚范围在几个纳米尺度内.通过电子能量损失谱(EELS)证明,Mo元素在原奥氏体晶界的偏聚能够提高钢的晶界结合强度.在钢中添加Mo能够显著提高钢的回火抗力和晶界结合强度,这是其具有高的延迟断裂抗力的主要原因.碳化物Mo2C对氢的捕集作用亦能够提高钢的延迟断裂抗力.Mo和V元素的二次硬化碳化物在半共格和非共格状态时,实验钢的延迟断裂抗力显著提高. 相似文献
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This article reports a new generation of Q460 multi-functional construction structural steel, which has high strength (yield strength larger than 460 MPa), excellent toughness (higher than 110 J/cm2 at - 60 °C), lower yield ratio (lower than 0.8), good fire resistance (yield strength at 600 °C larger than two-thirds of its room-temperature yield strength) and better corrosion resistance. The effects of finish cooling temperature (FCT) on the microstructure and properties were studied by scanning electron microscopy (SEM), transmission electron microscopy (TEM), emission electron probe micro-analysis (EPMA), electron backscattering diffraction (EBSD), tensile tester, impact tester, periodic immersion cycle acceleration test and electrochemical experiment. The results show that the strength and toughness are simultaneously improved by decreasing the FCT due to more lath-like bainite with large number of dislocations, refined martensite/austenite (M/A) with higher carbon concentration and increased high angle boundaries. In addition, the fire resistance of the newly developed Q460 steel is obviously better than the conventional one, which is mainly due to non-recrystallized lath-like bainite with high dislocation density at elevated temperature. The corrosion resistance of the new Q460 steel is also improved due to the addition of Cu and Cr. 相似文献