摘要
利用Aspex Explorer、扫描电镜及EDAX能谱仪对比研究了真空感应VIM＋电渣重熔ESR（工艺1）和真空感应VIM＋真空自耗VAR（工艺2）2种双联冶炼工艺对1种C-Cr-Ni-Mo高强度不锈钢铸锭中夹杂物与力学性能影响。研究结果表明,工艺2钢锭中气体的质量分数低于25×10^-6,夹杂物主要以形状不规则的Al2O3为主;而工艺1钢锭中气体的质量分数接近100×10^-6,夹杂物主要为Cr2O3、Al2O3,分布较均匀,尺寸在5μm左右;工艺1钢锭中氧化物夹杂数量明显多于工艺2,这是由于工艺1钢锭中O含量高所造成的,同时也表现出工艺1试样的冲击韧性及塑性明显低于工艺2。由此可见,采用工艺2可以大幅度降低钢中气体含量,提高钢的洁净度,改善钢的韧塑性。
The effect of two smelting processes（process 1：vacuum induction melting ＋ electroslag remelting and process 2：vacuum induction melting＋ vacuum arc remelting）on the inclusions in C-Cr-Ni-Mo stainless steel ingot and its mechanical properties were comparatively investigated by means of Aspex Explorer,scanning electron microscopy and EDAX spectrometer.The results show that the mass fraction of gas in the steel ingot casted through process 2 is less than 25×10^-6 with irregular shaped Al2O3 inclusions.On the other hand,the mass fraction of gas in the steel ingot casted through process 1 is approximate to 100×10^-6 with evenly distributed Cr2O3,Al2O3 inclusions in the size around 5μm.It is obvious that the number of oxide inclusions in ingot casted through process 1 is larger than that in ingot casted through process 2,due to the higher mass fraction of oxygen.Meanwhile,the impact toughness and ductility of specimens sampling from ingot casted through process 1 are clearly lower than those sampling from ingot casted through process 2.Thus,the conclusion could be carefully drawn that taking process 2 could significantly contribute to reducing the mass fraction of gas in steel and improving the cleanliness of steel.Therefore,the higher toughness and ductility of the steel could be obtained.
作者
朱梦赟
丁恒敏
刘振宝
梁剑雄
胡家齐
ZHU Meng-yun;DING Heng-min;LIU Zhen-bao;LIANG Jian-xiong;HU Jia-qi(Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China;Institute for Special Steel, Central Iron and Steel Research Institute, Beijing 100081, China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2018年第2期150-155,共6页
Journal of Iron and Steel Research
基金
国家高新技术冶资助项目(13T61180B)
关键词
真空感应熔炼
电渣重熔
真空自耗
洁净度
夹杂物
vacuum induction melting
electroslag remelting
vacuum arc remelting
cleanliness
inclusion
