摘要
在冲击载荷、高应力湿态磨料磨损条件下(1．47J冲击功),马氏体—贝氏体—奥氏体复相高Si/C中铬铸铁和马氏体高铬铸铁的磨损是以疲劳剥落为主,以显微切削为辅,前者的磨损速度低于后者。复相基体中有韧性相又有硬化相,具有较好的韧性与硬度配合且加工硬化性强,故其较耐磨;复相高Si/C中铬铸铁中有大量M_(7)C_(3)型共晶碳化物,是其耐磨的保障,该碳化物有一定硬韧性且该铸铁的碳化物颗粒较少、碳化物较粗大,一定程度上有利于降低磨损速度。上述两种材料有相近的耐蚀倾向。
Abstract
The wear characteristics of medium-chromium cast iron with martensite-baini-te-austenite duplex matrix and high Si/C ratios and martensite high-chromium
cast iron subjected to impact-abrasive and high-stress wet-abrasive wear was investigated. Experimental results showed that, under the conditions of impact-abrasive and high-stress wet-abrasive wear (impact energyi.47J), fatigue spalling is principal to the microcutting, and the wear rate for medium-chromium cast iron with M-B-A matrix and high Si/C ratios is lower than for martensite high-chromium cast iron.The main reason for lower wear rate has been found to both contain the toughness phase and hardening phase in M-B-A duplex matrix and to be stronger work hardening property.The secondary reason is that there exist more M,CS carbides in medivun-chromium cast iron with M-B-A matrix and high Si/C ratios, because the M7CS carbides have hardness-toughness property and the cast iron has little carbide grain and bigger carbide grain size.The corrosion resistance of two cast iron was found to be similar.
出处
《铸造》
CAS
CSCD
北大核心
1992年第9期16-21,共6页
Foundry
