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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.

本研究的目的是通过熔炼工艺，将两种合金连接起来，研制出碳化物含量较高的抗高温WEM材料。用扭转试验机研究了含铬10%~40%的共晶高铬铸铁在1000ﾟC以下的性能。剪切应变在600ﾟC时开始增加，在800~1000ﾟC温度范围内显著增大。高温强度，即600ﾟC以下剪切应力不变，与室温强度基本相同。在600ﾟC以上，随着温度的升高，强度逐渐降低，但在800ﾟC时，强度仍保持在150 Mpa左右。结果表明，27%铬铸铁具有最好的高温强度。用10%铬共晶铸铁分别添加10%的V、Mo、Nb、W等强碳化物形成元素，在1100ﾟC下，分别添加10%的V、Mo、Nb、W等强碳化物形成元素。另一方面，除V元素外，其他元素均显著降低了氧化率，Nb元素显著提高了抗氧化性。为了提高含大量碳化物的高铬铸铁的脆性，将具有很高抗氧化性和很好高温性能的26%铬共晶铸铁与低碳钢进行了纯钎焊连接。铜填充物。当两种合金在1100~1180ﾟC的温度范围内保温足够长的时间时，它们之间由铜熔体中析出的合金相(Fe-Cr-Cu-C)很好地结合在一起，接头的结合强度与母材的强度相差不大。该复合材料有望用于高温耐磨零件。