摘要
通过添加不同长度的含Mg包芯线对高碳工具钢75Cr1钢中夹杂物进行改性处理,对比研究了不同喂入长度下的夹杂物形态和微观组织变化规律;结合力学试验和形貌表征,研究了Mg处理对于试验钢组织及力学性能的影响规律。结果表明:Mg处理有利于细化夹杂物,可以将夹杂物核心部分改性为MgO·Al_(2)O_(3)或MgO,并形成以CaS包裹的小尺寸球型“核-壳”夹杂物;改性后的小尺寸夹杂物有利于钉扎晶界细化奥氏体晶粒;同时,小尺寸夹杂物还会阻碍钢中碳原子扩散从而降低珠光体形成孕育时间,减小珠光体片层间距,提高材料塑韧性。75Cr1高碳工具钢最佳包芯线喂入长度为2~2.5 m/t。
The morphology and microstructure changes of inclusions under different feeding lengths were compared and studied,when Mg containing cored wires of dfferent lengths were used to modify inclusions in high carbon tool steel 75Cr1 steel.The influence of Mg treatment on the microstructure and mechanical properties of experimental steel was studied by combining mechanical experiments and morphology characterization.The results show that Mg treatment is beneficial for refining inclusions,and the core part of the inclusions can be modified to MgO·Al_(2)O_(3)or MgO,forming small-sized spherical"core-shell"inclusions wrapped in CaS.The modified small-sized inclusions are beneficial for pinning grain boundaries and refining austenite grains.At the same time,small-sized inclusions can also hinder the diffusion of carbon atoms in the steel,thereby reducing the incubation time for pearlite formation,reducing the interlayer spacing of pearlite,and improving the material s plasticity and toughness.The optimal feeding length of the core wire for 75Cr1 high carbon tool steel is 2~2.5 m/t.
作者
徐光
齐江华
马英建
彭志贤
黄峰
刘静
XU Guang;QI Jianghua;MA Yingjian;PENG Zhixian;HUANG Feng;LIU Jing(Technology Center,Hunan Valin Lianyuan Iron and Steel Co.,Ltd.,Loudi 417000,China;School of Materials and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)
出处
《炼钢》
CAS
北大核心
2024年第3期72-81,共10页
Steelmaking
