Effects of alloying elements on microstructure and fracture properties of cast high speed steel rolls Part I: Microstructural analysis
Effects of alloying elements on microstructure and fracture properties of cast high speed steel rolls Part I: Microstructural analysis
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DOI：
10.1016/s0921-5093(98)00626-1
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发表时间：
1998-10-15
期刊：
影响因子：
6.4
通讯作者：
Lee, HC
中科院分区：
文献类型：
--
作者：
Hwang, EC;Lee, S;Lee, HC
研究了合金元素对六种离心铸造高速钢轧辊组织因素的影响。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射线衍射分析和硬度测量，以确定碳化物。根据强碳化物形成元素的含量，形成各种类型的碳化物。在高Cr含量的轧辊中，主要形成胞内MC碳化物和沿着胞界的M7 C3碳化物，而在高W和Mo含量的轧辊中，主要形成胞内MC碳化物和胞间区域的纤维状M2 C碳化物。影响轧辊整体硬度的最重要的显微组织因素是胞间碳化物及其分布。根据液相线图分析了合金元素的作用，提出了碳、钨、钼、铬和钒的适宜含量分别为1.9- 2.0%、3- 4%、3- 4%、5- 7%和5- 6%。(C)1998年Elsevier Science S.A. All rights reserved.
A study was made of the effects of alloying elements on microstructural factors of six high speed steel (HSS) rolls manufactured by centrifugal casting method. Particular emphasis was placed on the role of hard carbides located along solidification cell boundary and the type of the martensite matrix. Microstructural observation, X-ray diffraction analysis, and hardness measurement were conducted on the rolls to identify carbides. Various types of carbides were formed depending on the contents of strong carbide forming elements. In the rolls containing the high Cr content, MC carbides inside cells and M7C3 carbides along cell boundaries were primarily formed, while in the rolls containing the high W and Mo contents, MC carbides inside the cells and fibrous M2C carbides in the intercellular regions were dominantly formed. The most important microstructural factor affecting overall roll hardness was the intercellular carbides and their distribution. The effects of alloying elements were analyzed on the basis of the liquidus surface diagram, suggesting that the proper contents of carbon, tungsten, molybdenum, chromium, and vanadium were 1.9-2.0, 3-4, 3-4, 5-7, and 5-6%, respectively. (C) 1998 Elsevier Science S.A. All rights reserved.