共查询到19条相似文献,搜索用时 171 毫秒
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完整的钢种性能数据是机械产品设计和制造中正确选材和合理用材的基础,对机械产品的发展和更新具有益足轻重的影响。机械工业常用材料性能数据手册第一批推荐24个钢种,编为第一册。目前这些钢种用量较多,影响面较广,又最迫切需要提供完整的性能数据。本手册系统介绍了这些钢种的各项通用性能,常规机械性能,工艺性能;突出介绍了各种专项性能,例如,高周疲劳、低周疲劳、腐蚀疲劳、接触疲劳、扭转疲劳磨损、高低温冲击、脆性转变温度FATT、延性断裂韧度J、裂纹尖端张开位移8、疲劳裂纹扩展速率da/dN、裂纹扩展速率门槛值、△Kth、高温蠕变、持久强度、松弛、抗氧 相似文献
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对扬州诚德钢管有限公司生产的P92(10Cr9MoW2VNbBN)钢管(φ610 mm×102mm)材料进行了室温20、600、625℃的低周疲劳试验。结果表明:诚德钢管所生产的P92铜管在室温600、625℃均表现为循环软化,在总应变幅Δε_t/2较低时,室温20℃的低循环疲劳寿命最长,温度越高,疲劳循环寿命越短。与某进口P92钢管相比,在相同总应变幅下,扬州诚德所生产P92钢管材料室温时与进口P92钢管(φ350 mm×80mm)低循环疲劳寿命相近;高温时,扬州诚德所生产P92钢管材料低周疲劳性能优于进口P92铜管。 相似文献
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21世纪的飞行器骨架和发动机要求比目前的部件更能适应快速、远程的飞行。这将要求材料要具备更高的强度、较高的高温性能、高的刚度、低的密度,较好的断裂韧性,较低的疲劳裂纹生长速率和较好的抗冲击性能等。 相似文献
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利用实验室条件下冶炼的Fe-Cr-Nb-Mo铁素体不锈钢,对其高温强度和热疲劳性能进行了研究。研究结果表明:实验钢的高温抗拉强度和屈服强度优于或基本相当于目前所使用的铁素体不锈钢的性能;实验钢的热疲劳裂纹从V形缺口处萌生,夹杂物为裂纹萌生优先区域;热疲劳裂纹长度和扩展速度随热疲劳上限温度的升高而增大;热疲劳裂纹优先沿晶界扩展,高温氧化是疲劳裂纹扩展的主要因素。 相似文献
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《粉末冶金学》2013,56(4):283-290
AbstractTensile and high cycle fatigue properties of Ti–6Al–4V samples fabricated by powder injection moulding (PIM) are examined at room temperature and elevated temperatures. Standard wrought Ti–6Al–4V material is used for comparison. The tensile and the fatigue strength of samples fabricated by powder injection moulding are found to be significantly lower than conventional wrought material. On the other hand, strength and ductility of metal injection moulded (MIM) samples are high enough to be of large practical interest, in particular if the low processing costs for intricate shapes are taken into account. The inferior properties of the MIM material are caused by considerable remaining porosity, enlarged grain size and increased interstitial content. Prolonged sintering times lead to improved density and strength. At the same time, the room temperature ductility is observed to drop to very low levels, presumably because of additional grain growth. 相似文献
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超细晶粒钢及其力学性能特征 总被引:6,自引:0,他引:6
探索了在新一代钢中获得超细晶粒的方法。通过低温轧制和应变诱导铁素体相变,可以在碳素结构钢中获得晶粒尺寸小于5μm的超细晶粒,屈服强度大于400MPa。采用应变诱导铁素体相变可以在微合金钢中得到晶粒尺寸为1μm的超细晶粒。低碳微合金钢的屈服强度达到了600MPa,超低碳微合金钢的屈服强度超过了800MPa。采用微合金化和循环热处理可以在合金结构钢中获得2μm的奥氏体晶粒,1500MPa级抗拉强度下改善了耐延迟断裂性能。 相似文献
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对C质量分数分别为0.05%和0.09%的FGH96合金进行了显微组织和力学性能的分析。结果发现:C元素含量较高时,除了碳化物数量明显增多外,还会在晶界处形成较大尺寸的块状MC碳化物;但是,C元素含量并未对原始颗粒边界(prior particle boundary,PPB)、晶粒度及γ′相产生明显的影响。C元素含量较高会提高FGH96合金在650℃时的抗拉强度和屈服强度,但会降低其塑性。在低周疲劳试验中,C元素含量较高,形成的大块MC型碳化物分布于表面或亚表面,将会作为裂纹起源从而显著降低合金的低周疲劳性能。 相似文献
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Wei Yan Ping Hu Lifen Deng Wei Wang Wei Sha Yiyin Shan Ke Yang 《Metallurgical and Materials Transactions A》2012,43(6):1921-1933
Nitride-strengthened, reduced activation, martensitic steel is anticipated to have higher creep strength because of the remarkable
thermal stability of nitrides. Two nitride-strengthened, reduced activation martensitic steels with different carbon contents
were prepared to investigate the microstructure and mechanical property changes with decreasing carbon content. It has been
found that both steels had the microstructure of full martensite with fine nitrides dispersed homogeneously in the matrix
and displayed extremely high strength but poor toughness. Compared with the steel with low carbon content (0.005 pct in wt
pct), the steel with high carbon content (0.012 pct in wt pct) had not only the higher strength but also the higher impact
toughness and grain coarsening temperature, which was related to the carbon content. On the one hand, carbon reduction led
to Ta-rich inclusions; on the other hand, the grain grew larger when normalized at high temperature because of the absence
of Ta carbonitrides, which would decrease impact toughness. The complicated Al2O3 inclusions in the two steels have been revealed to be responsible for the initiated cleavage fracture by acting as the critical
cracks. 相似文献