There would be found distinct second " hardening apex in the curve when a conclusion was drawn that i : is likely that the most effective measurement to increase the strength and toughness is to fine grains and precipitate carbide nucleates of microalloyed elements , especially , fined grains of microalloyed elements increase the strength and toughness greatly 结论；综上所述，在一定的热处理工艺下，提高微合金化50crv钢强韧性的最有效的方法是细化晶粒和沉淀强化，特别是微合金元素的细化晶粒强化作用。
Abstract : the microstructure of as - cast high cr injection micro - alloying martensitic cast iron and the substructure of martensite in it have been observed under sem and tem . the alloying element distribution related to phase formation , as well as the various types of branch and distortion of carbide in the martensitic cast iron have been explored by using x - ray diffraction and electron probe analysis 文摘:应用扫描电镜和透射电镜研究了喷射微合金化的铸态马氏体高铬铸铁显微组织及马氏体的亚结构，并借助x射线衍射与电子探针分析探讨了合金元素的分布与相形成的关系，以及碳化物的不同形式分枝与畸变。
The effects of the fabrication and heat - treatment methods on the microstructures and properties of the nb - si system intermetallics have been studied and the optimized nb - si intermetallic system as well as the optimized fabrication and processing procedures have been selected . the presence of alloying elements as well as the morphology and microstructure of the compound phases with these elements has been investigated . the effects of the alloying elements on the high - temperature oxidation behavior of the nb - si system intermetallics have also been studied 本文研究了不同的制备工艺和热处理制度对nb - si系金属间化合物显微组织和性能的影响，优选了合适的材料体系、制备工艺和热处理制度，分析了微合金化元素及其形成相的组织、结构、形态、存在形式等及其对材料高温抗氧化行为的影响，提出了材料高温抗氧化行为和室温断裂行为的微观机制，为研制nb - si系金属间化合物基高温结构材料奠定了一定的基础。
Based on results of a large number of runs ， the following conclusions can be made at this stage of research . the fensile strength of the new steel added micro alloyed process is 1 . 1 times . as large as that of original specimens . impact toughness improved by 300 % , elongation ratio increased by 79 % hardness has a little improvement than before . the obtained results demonstrate that the new material has supermechanical properties with the addition of the micro allolyed process 并在常温下对合金化钢的力学性能进行了测试。试验结果表明，通过微合金化抗拉强度提高了10 . 2 % ，冲击韧性提高300 % ，延伸率提高了79 . 5 % ，硬度稍有提高。总之，加入复合稀土、钒、镍等微合金元素提高了材料的综合机械性能。
