摘要
从两方面提出了高锰钢铸造过程快速凝固方法以提高钢中氮含量。通过计算钢水开始凝固温度、降低过热度,建立了高锰钢从浇铸到凝固释放热量公式模型;提出了采用热导率更高的型砂、在砂模中添加冷却装置、浇铸过程中添加冷钢等加速钢水冷却的方法,并分析了影响铸件凝固时间的因素。结果表明:铸造砂热导率对铸件凝固时间的影响最大,其次是强化冷却,而过热度的影响最小。通过改善铸型冷却性能和悬浮铸造的方法可以显著缩短钢液凝固时间,有效抑制凝固过程氮的逸出,显著提高高锰钢中氮含量。
In order to increase the nitrogen content in high manganese steel,a method of rapid solidification during casting process was proposed from two aspects.By calculating the temperature at the start of molten steel solidification and reducing the superheat degree,the formula model of heat release from casting to solidification of high manganese steel was established.The methods of adopting the molding sand with higher thermal conductivity,adding cooling device in the sand mold and adding cold steel during casting process were proposed to accelerate the cooling of molten steel,and the factors affecting the solidification time of casting were analyzed.The results showed that(a)the thermal conductivity of casting sand had the greatest influence on the solidification time of casting,followed by enhanced cooling,while the superheat degree had the least effect;(b)the method of enhancing the cooling ability of the mold and suspension casting could significantly shorten the solidification time of molten steel,effectively inhibit the escape of nitrogen during solidification and significantly increase the nitrogen content in high manganese steel.
作者
刘吉猛
赵定国
陈晨
王书桓
LIU Jimeng;ZHAO Dingguo;CHEN Chen;WANG Shuhuan(Metallurgy and Energy College,North China University of Science and Technology,Tangshan Hebei 063210,China;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao Hebei 066004,China)
出处
《上海金属》
CAS
2023年第3期83-87,94,共6页
Shanghai Metals
基金
河北省自然科学基金(E2020209014)
河北省级科技计划(20311003D)
河北省自然科学基金重点项目(E2019209597)
河北省高校基本科研业务项目(JQN2022010)。
关键词
氮
高锰钢
铸造
冷却速率
凝固时间
nitrogen
high manganese steel
casting
cooling rate
solidification time
