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Research and Development of High Temperature Wear Resistant Materials with High Carbides

高碳化物高温耐磨材料的研究与开发

基本信息

批准号：
01850159
负责人：
MATSUBARA Yasuhiro
金额：
$ 2.3万
依托单位：
Kurume National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

项目摘要

The purpose of this research project is to develop the high temperature wem resistant materials with higher amount of carbides by means of melting process and by joining the two kinds of alloys.Properties of the eutectic high Cr cast irons containing 10% to 40%Cr were investigated at the temperatures up to 1000 ﾟC using a torsion testing machine. Shear strain started to increase at 600 ﾟC and enlarged markedly in the temperature range from 800ﾟC to 1000ﾟC. High temperature strength, that is, shear stress disn't vary up to 600 ﾟC and it kept about the same strength as that at room temperature. Over 600 ﾟC, the strength decreased gradually as the temperature was increased, but even at 800ﾟC the strength was about 15OMPa. The 27%Cr cast iron was found to have most excellent strength at high temperatures.Oxidation test at 1100 ﾟC was carried out under Po_2= 1 ate using 10%Cr eutectic cast iron separately added 10% of strong carbide forming element such as V, Mo, Nb and W. V greatly increased the oxidation of the iron, and in other words it worsened the oxidation resistance. On the other hand, each element except V decreased the oxidation ratio and Nb improved oxidation resistance remarkably.In order to reinforce the brittleness of high Cr cast iron with large amount of embides, 26%Cr eutectic iron, which has very high oxidation resistance and very superior high temperature properties, and mild steel were joined by means of brazing with pure. copper filler. When both alloys were held at the temperature range of 1100ﾟC to 1180ﾟC for enough time, they were well connected each other by alloyed phase(Fe-Cr-Cu-C)precipitated in molten copper and bond strength of the joint showed aliaest the same value as mother materials. This composite could be expected to use for wear resistant parts at high temperature.

本研究项目的目的是通过熔化工艺和连接两种合金来开发具有更高碳化物含量的高温耐焊缝材料。使用扭转试验机研究了含有10%至40%Cr的共晶高铬铸铁在高达1000℃的温度下的性能。剪切应变在600℃时开始增加，并在800℃至1000℃温度范围内显着增大。高温强度，即剪切应力在600℃以下都没有变化，保持与室温下大致相同的强度。超过600℃时，随着温度的升高，强度逐渐下降，但即使在800℃时，强度也约为15OMPa。发现27%Cr铸铁在高温下具有最优异的强度。在10%Cr共晶铸铁中，分别添加10%的V、Mo、Nb、W等强碳化物形成元素，在Po_2=1条件下进行1100℃的氧化试验。V大大加剧了铁的氧化，即使抗氧化性能变差。另一方面，除V外的各元素均降低了氧化率，Nb显着提高了抗氧化性能。为了强化大量嵌入的高铬铸铁的脆性，将具有极高抗氧化性能和优异高温性能的26%Cr共晶铁与低碳钢通过纯钎焊的方式连接在一起。铜填料。当两种合金在1100°C至1180°C的温度范围内保持足够的时间时，它们通过熔融铜中析出的合金相（Fe-Cr-Cu-C）相互连接良好，并且接头的结合强度至少与母材相同。这种复合材料有望用于高温耐磨部件。