摘要
文中利用金相显微镜、扫描电镜(SEM),探讨了Cr/C对含4%Ni耐磨耐蚀铸铁组织的影响规律。试验结果表明:Cr/C是影响含4%Ni耐磨耐蚀铸铁组织中碳化物数量和形态的主要因素。无论是通过固定Cr,还是固定C来改变Cr/C,都可以大幅度调整组织中碳化物的数量和形态。当Cr含量固定时,随着Cr/C的增加,组织中碳化物数量减少,且由网状向断网状和孤立的条块状转变,冲击断口由脆性加韧性的混合型断裂过渡为韧性断裂;当C含量固定在较低水平时,随着Cr/C的增加,组织中碳化物数量急剧增加,碳化物形态由断网状和孤立的条块状向网状转变,冲击断口由韧性断裂过渡为脆性断裂,但当C含量较高(2.5%)时,随着Cr/C的增加,组织中的碳化物数量增加不明显,且碳化物均为网状结构。
By the use of metallurgical microseope and scanning electron microseope （SEM）, this paper studies Ihe effects of Cr/C on the mierostrueture of high chromium wear resistant and corrosion resistant rast iron with 4 peircent of nickel. The resuhs show that; Cr/C is primary tactor of affecting amounts and forms of carbides in the microstructure of high chromium wear resistant and corrosion resistant cast iron with 4 pen, enl. Either keeping the content of chromium or keeping that of carlton to adjust Cr/C can both adjust amounts and forms of carbides greatly. With the content of chromium fixed ,as Cr/C increases, amounts of carbides decrease, forms of carbides change from reticulation to and impact fracture changes from brittle and duetile fracture to ductile fracture . With the content of carhon fixed at lower level, as Cr/C increases, amounts of carbides increase greatly, forms of earbides change from fracted reticulation and isolated strip to reticulation and impact fracture changes from ductile fracture to brittle fracture . But with content of carlton at higher level, as Cr/C increases, amounts of carhides ,don＇t increase obviously anti forms of carbides are all reticular.
出处
《机械工程师》
2005年第12期53-55,共3页
Mechanical Engineer
基金
黑龙江省自然科学基金资助项目(E0214)
哈尔滨市重点科技攻关项目(2002AA5CG026)
关键词
耐磨耐蚀铸铁
Cr/C
组织
碳化物
high chromiiu wear resistant and corrosion resistant cast iron
Cr/C mierostructure
carbide
