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| 1 | Application of nanoparticles in cast steel:An overview显示文摘The innovative and environmentally friendly methodologies for comprehensively enhancing the performances of high-strength steels without damage to plasticity,toughness and heat/corrosion/fatigue resistance are being developed.In recent years,nanoparticles elevate the field of high-strength steel.It is proposed that nanoparticles have the potential to replace conventional semi-coherent intermetallic compounds,carbides and alloying to optimize the steel.The fabrication process is simplified and the cost is lower compared with the traditional methods.Considerable research effort has been directed towards high-performance cast steels reinforced with nanoparticles due to potential application in major engineering.Nanoparticles are found to be capable of notably optimizing the nucleation behavior and precipitate process.The prominently optimized microstructure configuration and performances of cast steel can be acquired synchronously.In this review,the lattice matching and valence electron criterion between diverse nanoparticles and steel are summarized,and the existing various preparation methods are compared and analyzed.At present,there are four main methods to introduce nanoparticles into steel:external nanoparticle method,internal nanoparticle method,in-situ reaction method,and additive manufacturing method.These four methods have their own advantages and limitations,respectively.In this review,the synthesis,selection principle and strengthening mechanism of nanoparticles in cast steels for the above four methods are discussed in detail.Moreover,the main preparation methods and microstructure manipulation mechanism of the steel reinforced with different nanoparticles have been systematically expatiated.Finally,the development and future potential research directions of the application of nanoparticles in cast steel are prospected. | Feng Qiu Tian-shu Liu Xin Zhang Fang Chang Shi-li Shu Hong-yu Yang Qing-long Zhao Qi-chuan Jiang | 2020 | China Foundry2020，17，2： | 3 |
| 2 | 1Cr18Ni9Ti回油管开裂失效分析显示文摘某发动机涡轮后机匣回油管组件在工作过程中开裂引起漏油故障。本文通过对故障回油管组件进行宏观检查、分析断口、源区侧表面和材质、测量壁厚等工作,确定了回油管组件开裂的原因为疲劳,且回油管接头焊接处局部壁厚严重偏薄是导致回油管组件过早出现疲劳裂纹的主要原因。根据故障原因,通过改进回油管组件的加工工艺来控制壁厚及同轴度,有效避免了类似故障的重复发生。 | 孙睿毓 佟文伟 张开阔 刘博志 | 2022 | 风机技术2022，64，4： | 1 |
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