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硅对贝氏体铸钢高应力冲击磨损性能的影响 被引量:10
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作者 黄进峰 方鸿生 +1 位作者 徐平光 郑燕康 《钢铁研究学报》 CAS CSCD 北大核心 2001年第1期40-45,共6页
研究了不同硅含量 (0 .7%~ 2 .4% ,质量分数 ,下同 )贝氏体铸钢的抗高应力磨损性能和失效机制。结果表明 :高硅贝氏体铸钢的耐磨性能较低硅钢显著提高 ,其磨损失重约是低硅贝氏体铸钢的 1/ 2。这是因为硅使贝氏体铸钢在高应力冲击磨损... 研究了不同硅含量 (0 .7%~ 2 .4% ,质量分数 ,下同 )贝氏体铸钢的抗高应力磨损性能和失效机制。结果表明 :高硅贝氏体铸钢的耐磨性能较低硅钢显著提高 ,其磨损失重约是低硅贝氏体铸钢的 1/ 2。这是因为硅使贝氏体铸钢在高应力冲击磨损下表现出不同的失效机制。低硅 (0 .7% )贝氏体铸钢由于韧性低、组织结构粗大及树枝晶的微区成分偏析 ,故材料抵抗冲击的能力很低 ,常在表面还未形成强烈变形层 (白层 )甚至变形层时 ,就在变形层和材料基体内产生裂纹并扩展 ,故低硅贝氏体铸钢的失效方式为变形层和基体剥落机制。而硅含量为 1.6 %~ 2 .4%的高硅贝氏体铸钢 ,因脆性的渗碳体被韧性的残余奥氏体所代替 ,钢的韧性显著提高 ,失效方式表现为白层的剥落机制。 展开更多
关键词 贝氏体钢 铸钢 磨损 耐磨性 高应力冲击
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高应力冲击磨料磨损时高铬铸铁成分及组织的选择 被引量:3
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作者 子澍 宋润泽 +2 位作者 张云霞 徐新民 赵遗志 《现代铸铁》 CAS 2006年第3期60-62,共3页
高应力冲击磨料磨损时,高铬白口铸铁应选共晶成分。细小的共晶碳化物之间的空间,能够对基体产生良好的保护。基体应是马氏体,它能抵抗冲击,变形小。
关键词 铬铸铁 高应力冲击磨料磨损 成分
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Dynamic characteristics of high stressed red sandstone subjected to unloading and impact loads 被引量:12
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作者 GONG Feng-qiang ZHONG Wen-hui +2 位作者 GAO Ming-zhong SI Xue-feng WU Wu-xing 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第2期596-610,共15页
In the process of deep projects excavation,deep rock often experiences a full stress process from high stress to unloading and then to impact disturbance failure.To study the dynamic characteristics of three-dimension... In the process of deep projects excavation,deep rock often experiences a full stress process from high stress to unloading and then to impact disturbance failure.To study the dynamic characteristics of three-dimensional high stressed red sandstone subjected to unloading and impact loads,impact compression tests were conducted on red sandstone under confining pressure unloading conditions using a modified split Hopkinson pressure bar.Impact disturbance tests of uniaxial pre-stressed rock were also conducted(without considering confining pressure unloading effect).The results demonstrate that the impact compression strength of red sandstone shows an obvious strain rate effect.With an approximately equal strain rate,the dynamic strength of red sandstone under confining unloading conditions is less than that in the uniaxial pre-stressed impact compression test.Confining pressure unloading produces a strength-weakening effect,and the dynamic strength weakening factor(DSWF)is also defined.The results also indicate that the strain rate of the rock and the incident energy change in a logarithmic relation.With similar incident energies,unloading results in a higher strain rate in pre-stressed rock.According to the experimental analysis,unloading does not affect the failure mode,but reduces the dynamic strength of pre-stressed rock.The influence of confining pressure unloading on the shear strength parameters(cohesion and friction angle)is discussed.Under the same external energy impact compression,prestressed rock subjected to unloading is more likely to be destroyed.Thus,the effect of unloading on the rock mechanical characteristics should be considered in deep rock project excavation design. 展开更多
关键词 deep rock excavation unloading unloading confining pressure three-dimensional high stress strengthweakening effect impact disturbance
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Stress-Strain Behavior of Nylon-Carbon Composite Subjected to High Strain Rate Impact Loading
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作者 Noori Hassoon Mohammed A1-Saadi 《Journal of Energy and Power Engineering》 2015年第9期791-795,共5页
The aim of this study is to investigate the dynamic stress-strain relation for the hybrid composite (nylon +carbon). Three groups of specimens are used with different number of carbon layers. The specimens were sub... The aim of this study is to investigate the dynamic stress-strain relation for the hybrid composite (nylon +carbon). Three groups of specimens are used with different number of carbon layers. The specimens were subjected to high velocity impact with different strain rates. SHPB (split Hopkinson pressure bar) is used in this investigation. The results show that, the stress-strain relation various with the strain rate. The maximum stress and strain are proportion directly with the strain rate. Also, the results revealed that, as the number of carbon layer increased, the maximum strain decreased. 展开更多
关键词 High strain rate split Hopkinson pressure bar COMPOSITE high strain rate impact.
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