热处理对高耐磨性NiTi基合金材料性能的影响

Effect of heat treatment on the properties of high wear resistance materials of NiTi alloys

通过光学金相和显微硬度实验的分析方法,研究了热处理制度对高耐磨性NiTi合金材料性能的影响。实验表明,NiTi耐磨材料经过不同的热处理工艺后,材料的硬度变化明显,在800℃×30min/WQ+300℃×240min/FC热处理工艺制度下其硬度值最高;800℃固溶处理后,随着300℃时效时间的延长,材料显微组织鱼骨状晶逐渐增加,线状晶逐渐减少;黑色颗粒状质点逐渐增加,基体得到强化,材料显微硬度逐渐升高。随着冷却速度的增加,材料的晶粒得到细化。

By utilizing the test of the optics metallographical and microhardness, the influence of heat treatment on performance of high wear resistance materials for NiTi alloys was researched in this paper. The result showed the microhardness of wear resistant of NiTi60 had obvious change with different heat treatment. When the heat treatment was 800℃×30min/WQ＋300℃×240min/FC, we get the highest microhardness value. After solution at 800℃, the fishbone crystals gradually increased but linear crystals gradually decreased with the extension of time about 300℃. Black mass point gradually increased which made higher strengthen of the matrix crystal and improved the material microhardness value. The crystals refined with the different cooling relocity.