工程科学学报.第43卷，第4期：537-544.2021年4月 Chinese Journal of Engineering,Vol.43,No.4:537-544,April 2021 https://doi.org/10.13374/j.issn2095-9389.2020.03.05.001;http://cje.ustb.edu.cn 总氧含量对齿轮钢中非金属夹杂物的影响 何肖飞⑧，胡成飞，徐乐，王毛球 钢铁研究总院特殊钢研究所.北京100081 ☒通信作者，E-mail:xiaofei6423@126.com 摘要为了保证齿轮钢中非金属夹杂物的控制，并确定齿轮钢经济合理的总氧含量控制目标，开展了总氧含量对齿轮钢中 非金属夹杂物的影响研究.以三种不同总氧含量的Mn-Cr系齿轮钢为研究对象，利用Aspx扫描电镜、极值法、疲劳测试等 不同方法研究了齿轮钢中非金属夹杂物数量、分布、尺寸等，获得了夹杂物与齿轮钢总氧含量的对应关系.在本文实验条件 下，随着总氧含量的降低，钢中氧化物夹杂数量不断减小，其中5~10m的小尺寸夹杂物减小最明显，而10m以上的大尺 寸夹杂物数量变化规律不明显.另外，极值法和疲劳试验结果表明，总氧含量高时（质量分数为0.0013%），钢中最大氧化物夹 杂尺寸也较大，比总氧质量分数为0.0010%和0.0005%的实验钢的最大夹杂物尺寸高10um以上，且当总氧含量比较低时 (质量分数≤0.0010%).实验钢总氧质量分数变化(0.0010%、0.0005%)对钢中最大夹杂物尺寸影响不大 关键词齿轮钢：总氧：非金属夹杂物：最大尺寸：极值法 分类号TF4 Effect of total oxygen on the nonmetallic inclusion of gear steel HE Xiao-fe,HU Cheng-fei,XU Le,WANG Mao-qiu Institute of Special Steels,Central Iron and Steel Research Institute,Beijing 100081,China Corresponding author,E-mail:xiaofei6423@126.com ABSTRACT It is an important symbol of the metallurgical quality level of special steel for inclusion controlling,which can improve the service performance of special steel to a greater extent.As a typical steel grade,gear steel,in the special steel field,is also required strictly in controlling of inclusions.It is known that total oxygen content can reflect the level of inclusions to some extent.Since the 1980s,ultralow oxygen has become a direction for the development of special steel.To guarantee controlling of nonmetallic inclusions and determine a reasonable control target of total oxygen content in the gear steel,the effect of total oxygen content on nonmetallic inclusions in gear steel was studied.In this study,three kinds of Mn-Cr-system gear steels with different oxygen content were selected as research objects.The number,distribution,and size of nonmetallic inclusions in these gear steels were studied using an Aspex scanning electron microscope (Aspex SEM),the extreme value method,and fatigue test.The relationship between inclusions and the total oxygen content of gear steel was obtained.Under the experimental condition,with the decrease in total oxygen content,the density of the number of oxide inclusions decreases continuously,among which 5-10 um small inclusions decrease most obviously.In contrast, the number density of large inclusions above 10 um does not change obviously.Moreover,the results of the extreme value method and fatigue test show that when total oxygen mass fraction is high (0.0013%),the size of maximum oxide inclusion in the steel is relatively large,which is more than 10 um higher than the inclusion in .0010%or0.0005%total oxygen steel.Simultaneously,when total oxygen mass fraction is low (0.0010%),the change of total oxygen mass fraction (0.0010%and 0.0005%)has little effect on the maximum inclusion size in steel. 收稿日期：2020-03-05 基金项目：国家重点研发计划资助项目(2016YFB0300102)总氧含量对齿轮钢中非金属夹杂物的影响 何肖飞苣，胡成飞，徐    乐，王毛球 钢铁研究总院特殊钢研究所，北京 100081 苣通信作者，E-mail：xiaofei6423@126.com 摘    要    为了保证齿轮钢中非金属夹杂物的控制，并确定齿轮钢经济合理的总氧含量控制目标，开展了总氧含量对齿轮钢中 非金属夹杂物的影响研究. 以三种不同总氧含量的 Mn–Cr 系齿轮钢为研究对象，利用 Aspex 扫描电镜、极值法、疲劳测试等 不同方法研究了齿轮钢中非金属夹杂物数量、分布、尺寸等，获得了夹杂物与齿轮钢总氧含量的对应关系. 在本文实验条件 下，随着总氧含量的降低，钢中氧化物夹杂数量不断减小，其中 5～10 μm 的小尺寸夹杂物减小最明显，而 10 μm 以上的大尺 寸夹杂物数量变化规律不明显. 另外，极值法和疲劳试验结果表明，总氧含量高时（质量分数为 0.0013%），钢中最大氧化物夹 杂尺寸也较大，比总氧质量分数为 0.0010% 和 0.0005% 的实验钢的最大夹杂物尺寸高 10 μm 以上，且当总氧含量比较低时 （质量分数≤0.0010%），实验钢总氧质量分数变化（0.0010%、0.0005%）对钢中最大夹杂物尺寸影响不大. 关键词    齿轮钢；总氧；非金属夹杂物；最大尺寸；极值法 分类号    TF4 Effect of total oxygen on the nonmetallic inclusion of gear steel HE Xiao-fei苣 ，HU Cheng-fei，XU Le，WANG Mao-qiu Institute of Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China 苣 Corresponding author, E-mail: xiaofei6423@126.com ABSTRACT    It is an important symbol of the metallurgical quality level of special steel for inclusion controlling, which can improve the service performance of special steel to a greater extent. As a typical steel grade, gear steel, in the special steel field, is also required strictly in controlling of inclusions. It is known that total oxygen content can reflect the level of inclusions to some extent. Since the 1980s, ultralow oxygen has become a direction for the development of special steel. To guarantee controlling of nonmetallic inclusions and determine a reasonable control target of total oxygen content in the gear steel, the effect of total oxygen content on nonmetallic inclusions in gear steel was studied. In this study, three kinds of Mn–Cr-system gear steels with different oxygen content were selected as  research  objects.  The  number,  distribution,  and  size  of  nonmetallic  inclusions  in  these  gear  steels  were  studied  using  an  Aspex scanning electron microscope (Aspex SEM), the extreme value method, and fatigue test. The relationship between inclusions and the total oxygen content of gear steel was obtained. Under the experimental condition, with the decrease in total oxygen content, the density of the number of oxide inclusions decreases continuously, among which 5–10 μm small inclusions decrease most obviously. In contrast, the number density of large inclusions above 10 μm does not change obviously. Moreover, the results of the extreme value method and fatigue test show that when total oxygen mass fraction is high (0.0013%), the size of maximum oxide inclusion in the steel is relatively large, which is more than 10 μm higher than the inclusion in 0.0010% or 0.0005% total oxygen steel. Simultaneously, when total oxygen mass fraction is low (≤0.0010%), the change of total oxygen mass fraction (0.0010% and 0.0005%) has little effect on the maximum inclusion size in steel. 收稿日期: 2020−03−05 基金项目: 国家重点研发计划资助项目（2016YFB0300102） 工程科学学报，第 43 卷，第 4 期：537−544，2021 年 4 月 Chinese Journal of Engineering, Vol. 43, No. 4: 537−544, April 2021 https://doi.org/10.13374/j.issn2095-9389.2020.03.05.001; http://cje.ustb.edu.cn