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我厂于1979年开始试用加硼铸铁,制造前进型机车的汽室套。经在郑北机务段配属的前进型2910号和2911号机车上实际运用,走行15万多公里后磨耗仅0.7～0.85毫来,与原用灰铸铁汽室套相比寿命提高3～4倍,顶计能用一个厂修期,充分显示了硼铸铁的耐磨性能。据此工厂决定从1980年9月起,前进型和建设型机车的汽室套全部改用硼铸铁制造。一、硼铸铁的金相组织硼铸铁的耐磨性取决于其金相组织,包括石墨、基体和硬质相,主要是硬质相。在选择硼铸铁汽室套的化学成份、金相组织
I plant began trial in 1979 with boron cast iron, making forward steam locomotive sets. The actual use of the 2910 and 2911 locomotives associated with the Chengbei locomotive depot was only 0.7 to 0.85 milliseconds after more than 150,000 km of travel and an increase of 3 to 4 times in life compared with the gray cast iron chamber , The top can use a factory repair period, fully demonstrated the wear resistance of boron cast iron. Accordingly, the factory decided that from September 1980 onward, steam chamber sleeves for forward-type locomotives and construction locomotives would all be made of boron cast iron. First, the boron cast iron metallographic structure Boron cast iron wear resistance depends on the metallographic structure, including graphite, matrix and hard phase, mainly hard phase. In the choice of boron cast iron chamber sets of chemical composition, microstructure