Effects of alloying elements on microstructure, hardness, and fracture toughness of centrifugally cast high-speed steel rolls
Effects of alloying elements on microstructure, hardness, and fracture toughness of centrifugally cast high-speed steel rolls
复制标题
DOI：
10.1007/s11661-005-0141-0
复制
发表时间：
2005-01-01
影响因子：
2.8
通讯作者：
Yang, JS
中科院分区：
文献类型：
--
作者：
Kim, CK;Park, JI;Yang, JS
研究了合金元素对离心铸造高速钢轧辊显微组织、硬度、断裂韧性的影响。特别强调了位于沿着凝固胞边界的硬质碳化物的作用和回火马氏体基体的类型。对轧辊进行了显微组织观察、X射线衍射分析、硬度和韧性测试以及断口观察。胞间边界内观察到的碳化物的组成和形态根据组成它们的主要合金元素而变化。由于这些块状碳化物的高硬度，它们强烈地影响了块体材料的硬度和断裂韧性。根据液面图分析了合金元素的作用，指出碳当量、钨当量和钒的适宜含量为1.9 ~ 2.0。10至11%和5至6%。轧辊材料中含有少量的胞间碳化物和板条型回火马氏体基体，由于碳化物分布均匀，具有优良的断裂韧性。因此，建议优化合金元素，以实现碳化物的均匀分布。
A study was made of the effects of alloying elements oil the microstructure, hardness, and fracture, toughness of centrifugally cast high-speed steel (HSS) rolls. Particular emphasis was placed on the role of hard carbides located along solidification cell boundaries and the type of the tempered martensitic matrix. Microstructural observation, X-ray diffraction analysis, hardness and fracture-toughness measurements, and fractographic observations were conducted on the rolls. The constitution and morphology of carbides observed within the intercellular boundaries varied depending upon the predominant alloying elements that comprised them. These massive carbide formations strongly influenced the bulk material hardness and fracture toughness due to their high hardness. The effects of alloying elements were analyzed on the basis of the liquidus-surface diagram which and indicated that the proper contents of the carbon equivalent (CE), tungsten equivalent, and vanadium were 1.9 to 2.0. 10 to 11, and 5 to 6 pct, respectively. The roll material, containing a small amount of intercellular carbides and lath-type tempered martensitic matrix, had excellent fracture toughness, since carbides, were well spaced. Therefore, it was suggested that the optimization of alloying elements was required to achieve the homogeneous distribution of carbides.