共查询到19条相似文献,搜索用时 109 毫秒
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主要对在水的环境下包括奥贝球铁在内的球墨铸铁的机械性能进行了试验研究,发现了球墨铸铁在湿润环境下的脆化现象;是湿润环境下球墨铸铁环境脆化现象的机理地行了分析研究,认为其起因是在塑性变形时水发生了分解,导致氢脆;提出了氢的发生模型。 相似文献
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研究了水附着对不同基体组织球铁的拉伸性能的影响,结果表明,水附着拉伸试验中,奥贝球铁、球光体球铁、淬火回火球铁的拉伸强度和伸长率同时下降,发生显著的水脆化;而铁素体球铁几乎无水脆化现象,这种水脆化现象是在超过屈服点的塑性变形中球铁表面附着水分解的氢的氢脆而导致的。 相似文献
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《金属学报》2017,(5)
为了评价反应堆候选结构材料与液态金属的相容性,针对低活化马氏体钢在液态Pb-Bi共晶中的拉伸脆化现象,采用2种拉伸速率的拉伸实验,研究了中国低活化马氏体钢(CLAM)在200~500℃范围内的Ar气和液态Pb-Bi共晶环境中的拉伸断裂行为。结果表明,在Ar气环境中拉伸时,CLAM钢均为韧性断裂;而在液态Pb-Bi共晶环境中拉伸时,在300~450℃下会出现脆性断裂现象。在300~450℃脆化温度区间内试样强度变化不大,但总延伸率显著降低,出现"韧谷"现象。然而拉伸温度在低于或高于脆化温度区间时,脆断现象消失,总延伸率回复到与对比试样相同水平。在更低的拉伸速率下,CLAM钢发生"韧谷"现象的温度区间明显扩大,表明拉伸速率对CLAM钢在液态Pb-Bi共晶中的脆化也有影响。经低温回火硬化后,CLAM钢在液态PbBi共晶中出现拉伸脆化现象是由于液态Pb-Bi接触裂纹尖端后造成表面能降低,进而降低临界解理应力而发生脆性断裂。 相似文献
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球墨铸铁球化及其孕育处理研究进展 总被引:1,自引:0,他引:1
论述了球墨铸铁球化和孕育处理的国内外研究现状,介绍了球墨铸铁石墨球化及其孕育处理的方法、石墨球化理论、孕育机理和球化、孕育处理方法,同时介绍了球化和孕育方法在铸态下制造薄壁高强度球墨铸铁件和Y型高强度球墨铸铁件方面的应用。 相似文献
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Hydrogen embrittlement of commercial purity titanium 总被引:1,自引:0,他引:1
C.L BriantN Chollocoop 《Corrosion Science》2002,44(8):1875-1888
This paper presents a study of hydrogen embrittlement of commercial purity titanium. The first part of the results section considers gaseous hydrogen embrittlement of grade 2 titanium. This particular heat of material had been found to be very resistant to hydrogen cracking when tested in acidic salt water conditions. A thick hydride layer would form on the surface but this film had little effect on mechanical properties. However, when exposed to gaseous hydrogen at elevated temperatures this material readily formed hydrides and the material became very brittle. In addition to our discussion of these results we also present results for grade 4 titanium tested in sodium chloride solution and compare it with previously reported results on the grades 2 and 3 titanium. Of these three grades of titanium, only the grade 3 showed susceptibility to hydrogen embrittlement when tested in the sodium chloride environment. We suggest that the reason why this material was more susceptible to hydride formation and hydrogen embrittlement was because of the higher iron content of the grade 3 titanium. 相似文献
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SURFACEREACTION,HYDROGENDIFFUSIVITYANDENVIRONMENTALEMBRITTLEMENTOFINTERMETALLICCOMPOUNDSNi_3AlANDFe_3AlWANXiaojing;ZHUJiahong;... 相似文献
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对70钢卡夹螺旋弹簧的化学成分、金相组织及断口分析表明,其断裂的主要原因是氢脆。其断裂机制属氢致延迟破坏,系弹簧电镀工艺不当所致,并提出了改进措施。 相似文献
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The detrimental effect which hydrogen produces in metals, generally known as hydrogen embrittlement (HE), has always been one of the central problems of practical material technology of corrosion and protection of metals. In the present research, the influence of simulated heat affected zone (HAZ) hardness on susceptibility of a structural steel to hydrogen embrittlement was investigated mainly under slow strain rate testing (SSRT), although limited tests were carried out by means of small amplitude, cyclic (ripple) loading. These tests have been supported by detailed scanning electron fractography and hydrogen permeation measurements. A good correlation is observed between the degree of embrittlement in slow strain rate tests and the steady state hydrogen permeation current density. 相似文献
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金属体系中氢进入及破坏过程的电化学方法研究 总被引:4,自引:0,他引:4
综述了研究氢进入和破坏金属体系的电化学方法及 过程,对金属材料中有或无氢陷阱时的氢渗透研究进行了分析和总结,讨论了金属材料中电 化学方法产生的氢进入及破坏过程及动力学. 相似文献