碳素钢中氧含量与氧化物分量的测定及其对应关系的探讨

doi:10.13228/j.boyuan.issn1000-7571.011144

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摘要借助氧氮分析仪的程序升温功能,研究了样品表面裂纹对氧含量测定的影响及碳素钢中氧含量的释放特征,探讨了其中不同氧化物与分解释放温度的对应关系。采用氧氮分析仪的温度维持程序升温模式,测定了碳素钢裂纹样品中的氧含量,对其升温曲线和氧释放曲线进行分析,结果表明:碳素钢中氧的释放峰通常分为低(1 800 ℃以下)、中(1 950 ℃左右)、高(2 200 ℃左右)3个温度区段;裂纹的存在只影响小于1 800 ℃的低温段氧含量,对不小于1 800 ℃的中、高温度平台内氧释放峰位置与强度(氧含量)没有影响。实验建立了合理的分步阶梯程序升温参数,用分步阶梯程序升温模式测定了表面裂纹样品和表面洁净的正常样品中氧含量分量,结果表明,碳素钢样品的低温段氧含量为样品内部存在的少量低温氧化物中氧和固溶氧两部分的合量;中、高温段氧含量之和不受制样方法、样品状态或样品表面质量的影响。进行了碳素钢中可能存在氧化物的脉冲熔融分解温度模拟试验,探讨了其中氧含量分量与不同氧化物的对应关系。结果表明,碳素钢中FeO、MnO、NiO、Fe₂O₃等分解温度均低于1 800 ℃;经分步阶梯升温方式扣除小于1 800 ℃的氧释放峰后,中、高温段释放峰所对应的氧含量与钢中各类氧化物夹杂的含量(如SiO₂、Al₂O₃、CaO及其复杂化合物)直接相关。

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	任维萍
	刘爱坤
	刘国锋

关键词 ：碳素钢, 表面裂纹, 氧化物夹杂, 分步阶梯升温, 氧含量

Abstract：With the aid of temperature programming function of oxygen-nitrogen analyzer, the influence of sample surface crack on the determination of oxygen content as well as the release feature of oxygen content in carbon steel were studied. The corresponding relationship between different oxides and decomposition release temperature was discussed. The oxygen content in crack sample of carbon steel was determined by the temperature keep warming program of oxygen-nitrogen analyzer. The warming curve and oxygen release curve was analyzed. The results showed that the release peaks of oxygen in carbon steel usually had three temperature ranges, i.e., low temperature (below 1 800 ℃), medium temperature (around 1 950 ℃) and high temperature (around 2 200 ℃). The existence of cracks only influenced the oxygen content in low temperature zone (below 1 800 ℃), while it had no influence on the oxygen release peak position and intensity (oxygen content) in the zone of medium temperate and high temperature (not less than 1 800 ℃). The reasonable parameters of substep ladder warming program were established in experiments. The oxide components in the surface crack sample and the normal sample with clean surface were determined at the mode of substep ladder warming program. The results showed that the oxygen content at low temperature zone in carbon steel sample was the sum of oxygen in few low temperature oxides and the solid solution oxygen. The sum of oxygen content in the zone of medium temperate and high temperature was not affected by the sample preparation method, the sample state or sample surface quality. The pulse melting decomposition temperature simulation experiments of oxides, which possibly existed in carbon steel, were conducted. The corresponding relationships between oxygen component and various oxides were discussed. The results showed that the decomposition temperatures of FeO, MnO, NiO and Fe₂O₃ in carbon steel were all below 1 800 ℃. After the oxygen release peak below 1 800 ℃ was deducted by sufstep ladder warming program, the oxygen content, which was corresponding to the release peaks in the zone of medium temperate and high temperature, was directly related to the contents of various oxide inclusions (such as SiO₂, Al₂O₃, CaO and their complex compounds) in the steel.

Key words： carbon steel surface crack oxide inclusion substep ladder warming oxygen content

收稿日期: 2020-07-11

ZTFLH:	O659.2
	TG115.3+1

作者简介: 任维萍(1966—),女,正高级工程师,大学本科,主要研究方向为冶金材料仪器及化学分析方法的应用与研究;E-mail:2637741743@qq.com

引用本文:

任维萍, 刘爱坤, 刘国锋. 碳素钢中氧含量与氧化物分量的测定及其对应关系的探讨[J]. 冶金分析, 2021, 41(6): 8-15. REN Weiping, LIU Aikun, LIU Guofeng. Determination of oxygen content and oxide component in carbon steel and discuss on their corresponding relationship. , 2021, 41(6): 8-15.

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http://yjfx.chinamet.cn/CN/10.13228/j.boyuan.issn1000-7571.011144 或 http://yjfx.chinamet.cn/CN/Y2021/V41/I6/8

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