稠油泵内表面的重熔强化

Remelting Harding for Inter Surfacing of Thick Oil Pump

关键词:  铸铁  硬度  耐磨性

Key words:  cast iron  hardness  wear-resistibility

摘要:

提高稠油泵铸铁壳体内表面的耐磨性,直接影响到泵的使用寿命。本文针对提高铸铁耐磨性的问题,以灰口铸铁HT200为目标,通过系列试验,对铸铁钨极氩弧局部重熔强化原理进行了系列的研究,研究得出电弧电流、熔化速度等工艺参数对重熔层金相组织和耐磨性的影响规律。同时与铸铁激冷,WC焊条堆焊做了试验对比,证明重熔强化是利用钨极氩弧和铸铁的组织转变特点,发挥自身潜力、降低成本的一项新技术。

Abstract:

To improve wear resistibility of inter surface for thick oil pump shell made form cast iron that will increase the time of pump itself directly.The wear resistibility of grey cast iron HT200 is increased through hardening the surface of cast iron which is obtained as remelting it with tungsten inert shielded gas arc.The effect of arc current and melting rate on the microstructure and wear resistance is studied.The results are compared with those of WC electrode hardfacing for cast iron with chilled treating and proved that remelting hardening principle is much better and cheaper technique than the others.