摘要
分析了高CE高强度灰铸铁的生产情况和存在的问题，阐述了N元素对抗拉强度的影响原理，为探究加（N）量的最佳范围，分别在包内加人0．1％、O．2％、O．3％、0．4％、0．5％的氮化铬进行试验，并得出以下结论：（1）加入氮化铬后，珠光体的片层间距并没有明显的变化，都是细片状珠光体，但石墨变得弯曲、短小且数量增多，部分石墨也出现分枝结构，说明N元素是通过对石墨形态的影响来提高铸件的抗拉强度；（2）制动盘产生N2气孔的w（N）量临界点为170ppm；（3）将w（N）量控制在140—170ppm，可以提高铸件的抗拉强度和硬度。
The production problems of high strength gray cast iron with high CE was analyzed. The principle of N to tensile strength was elaborated. In order to explore the optimum range amount of N, CrN was added into the castings by 0.1%, 0.2%, 0.3% ,0.4% and 0.5%. The conclusions could be drown as follows：with chromium carbide added,pearlite spacing had no significant change. They were fine flaky pearlite but graphite became curved and increased in the number. Some graphite also appeared branching structure. That explained that N influenced the castings tensile strength by improving the graphite morphology. The critical point of w（N） on brake discs produce N2 pores was the amount of 170 ppm. The tensile strength and hardness of the casting got improved by controlling that at 140-170 ppm.
出处
《现代铸铁》
CAS
2016年第6期53-55,83,共4页
Modern Cast Iron
