Development of High Speed Steels with a Fine Grain Size by Carbide Dispersion Carburization (CDC) Process.

通过碳化物弥散渗碳 (CDC) 工艺开发细晶粒高速钢。

基本信息

批准号：
08555160
负责人：
KAINUMA Ryosuke
金额：
$ 6.34万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08555160/
关键词：
CARBRIZATION STEELS Fe-V-Mo-C SYSTEM PHASE DIAGRAM CDC PROCESS WEAR RESISTANCE HIGH SPEED STEEL Fe-V-Mo-C系耐磨耗材料

项目摘要

Recently, a new type of process to fabricate high speed steels consisted of hyperfine grains together with uniformly distributed particles, which is called as carbide dispersion carburization (CDC) process, is proposed. In this process, the superior resistance to wear and the outstanding toughness can be obtained by carburizing C-free Fe base alloys with high contents of Ti, V,Mo, W etc..In this study, an attempt by CDC process was made to produce high speed steels with very high hardness over Hv1000 on the basis of information of the calculated phase diagrams. The obtained results are as follows :(1) In order to establish a data base for estimating phase equilibria of the Fe-base multi-component systems, thermodynamic analysis of Fe-C and Fe-N base systems were performed.(2) On the basis of results of the thermodynamic analysis, microstructural evolution (including the kind, content and volume fraction of carbides appearing during carburizing and heat treatment) of Fe-V-Mo-C alloys was simulated.(3) Volume fraction, size and distribution of carbides in several Fe-V-Mo-C specimens with different composition produced by CDC process have been measured. The result of the examination suggests that the carbon content and the atomic ratio between V and Mo are the most important factors for determining the size and distribution of carbides.(4) On the basis of such the calculation and examination for the microstructural control, some alloys with suitable composition for obtaining both high hardness and toughness have been produced and examined. Consequently we could get some excellent alloys with hardness over Hv 1000.At the present, a cooperation project for practical applications with steel making companies is running.

最近，提出了一种制造由超细晶粒和均匀分布颗粒组成的高速钢的新型工艺，称为碳化物弥散渗碳（CDC）工艺。在此工艺中，通过对Ti、V、Mo、W等含量较高的无碳铁基合金进行渗碳，可以获得优异的耐磨性和突出的韧性。本研究尝试采用CDC工艺根据计算相图的信息生产具有 Hv1000 以上硬度的高速钢。所得结果如下：(1)为了建立估计Fe基多组分体系相平衡的数据库，对Fe-C和Fe-N基体系进行了热力学分析。(2)在热力学分析结果的基础上，模拟了Fe-V-Mo-C合金的显微组织演变（包括渗碳和热处理过程中出现的碳化物的种类、含量和体积分数）。（3）体积分数、尺寸和分布碳化物的对 CDC 工艺生产的几种不同成分的 Fe-V-Mo-C 样品进行了测量。检验结果表明，碳含量和V、Mo原子比是决定碳化物尺寸和分布的最重要因素。(4)在此基础上对显微组织控制进行了计算和检验，得出了一些结论。已经生产并检验了具有适当成分以获得高硬度和韧性的合金。因此我们可以获得一些硬度超过Hv 1000的优质合金。目前，与钢铁公司的实际应用合作项目正在进行中。