含钛齿轮钢中CaO-Al2O3-TiOx+TiN系夹杂物形成机理

doi:10.13228/j.boyuan.issn0449-749x.20200058

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (2551 KB) HTML (0 KB)
Export: BibTeX | EndNote (RIS)

Abstract Industrial and laboratory experiments were carried out to investigate the formation mechanism of a special kind of complex inclusions (TiN surrounded by CaO-Al₂O₃-TiO_x) in 20CrMnTi gear steel, and thermodynamic calculations were also conducted to check the possibility of the formation of TiN by the dissolved elements in the liquid steel. It is found that Ti-Fe alloy has poor cleanliness and contains many Al₂O₃ and TiN inclusions. At the steelmaking temperature, the reaction of dissolved Ti and N in steel to form TiN is thermodynamically impossible. The TiN core of the complex inclusions cannot be generated by the direct reaction between dissolved Ti and N in the steel but should be sourced from the Ti-Fe alloy. When the liquid CaO-Al₂O₃-TiO_x inclusions collide with the undissolved TiN, TiN inclusions would be wrapped by the liquid inclusions, thus forming larger CaO-Al₂O₃-TiO_x inclusions with a TiN core inside. Ti-Fe alloys with lower nitrogen content are suggested to control these inclusions.

Key words： Ti-bearing gear steel inclusion TiN formation mechanism Ti-Fe alloy

Received: 18 February 2020

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	HAO Guang-yu
	YUAN Kang
	GAO Jing
	DENG Zhi-yin
	ZHU Miao-yong

Cite this article:

HAO Guang-yu,YUAN Kang,GAO Jing等. Formation mechanism of CaO-Al₂O₃-TiO_x+TiN system inclusions in Ti-bearing gear steel[J]. Iron and Steel, 2020, 55(10): 37-42.

URL:

http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20200058 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I10/37

[1] JIANG M, WANG X H, CHEN B, et al. Laboratory study on evolution mechanisms of non-metallic inclusions in high strength alloyed steel refined by high basicity slag [J]. ISIJ International, 2010, 50(1): 95.
[2] Park J H, Todoroki H. Control of MgO·Al₂O₃ spinel inclusions in stainless steels [J]. ISIJ International, 2010, 50(10): 1333.
[3] DENG Z Y, ZHU M Y. Evolution mechanism of non-metallic inclusions in Al-killed alloyed steel during secondary refining process [J]. ISIJ International, 2013, 53(3): 450.
[4] Park J H, Lee S B, Henry R G. Thermodynamics of the formation of MgO-Al₂O₃-TiO_xinclusions in Ti-stabilized 11Cr ferritic stainless steel[J]. Metallurgical and Materials Transactions B, 2008, 39(6): 853.
[5] REN Y, ZHANG L F, YANG W, et al. Formation and thermodynamics of Mg-Al-Ti-O complex inclusions in Mg-Al-Ti-deoxidized steel[J]. Metallurgical and Materials Transactions B, 2014, 45(6): 2057.
[6] ZHANG T S, LIU C J, WU H, et al. Inclusion evolution after calcium addition in Ti-bearing Al-kill steel[J]. Ironmaking and Steelmaking, 2018, 45(2): 187.
[7] DENG Z Y, CHEN L, SONG G D, et al. Formation and evolution of non-metallic inclusions in Ti-bearing Al-killed steel during secondary refining process[J]. Metallurgical and Materials Transactions B, 2020, 51(1): 173.
[8] 刘南,辛广胜,王文义.包钢炼钢厂铝镇静钢工艺优化[J].钢铁,2018,53(11):36.(LIU Nan,XIN Guang-sheng,WANG Wen-yi. Process optimization of aluminum killed steel in Baogang Steel Mill[J].Iron and Steel,2018,53(11): 36.)
[9] 刘威,杨树峰,李京社,等.钙镁复合处理20CrMnTi钢中硫化物夹杂[J].钢铁,2017,52(12):21.(LIU Wei, YANG Shu-feng, LI Jing-she, et al. Modification of sulphide inclusions in 20CrMnTi steel by calcium-magnesium treatment[J]. Iron and Steel, 2017, 52(12): 21.)
[10] 白旭旭,杨树峰,刘威,等.碲处理对20CrMnTi齿轮钢中MnS夹杂物改性效果[J].钢铁,2019,54(12):35.(BAI Xu-xu, YANG Shu-feng, LIU Wei, et al. Effect of tellurium treatment on modification of MnS inclusions in 20CrMnTi gear steel[J]. Iron and Steel, 2019, 54(12): 35.)
[11] 邓志银,戈文英,胡博文,等.合金化对铝镇静钢中夹杂物的影响[J].钢铁,2019,54(10):30.(DENG Zhi-yin, GE Wen-ying, HU Bo-wen, et al. Effect of alloying on inclusions in Al-killed steel by a ferrochromium alloy[J]. Iron and Steel, 2019, 54(10): 30.)
[12] Morita Z, Kunisada K. Solubility of nitrogen and equilibrium of titanium nitride forming reaction in liquid Fe-Ti alloys[J]. Transactions of the Iron and Steel Institute of Japan, 1978, 18(10): 648.
[13] Pak J J, Jeong Y S, Cha W Y, et al. Thermodynamics of TiN formation in Fe-Cr melts[J]. ISIJ International, 2005, 45(8): 1106.
[14] 梁英教,车荫昌.无机物热力学数据手册[M].沈阳:东北大学出版社,1993.(LIANG Ying-jiao, CHE Yin-chang. Thermodynamic Data Handbook of Inorganic Substance[M]. Shenyang: Northeastern University Press,1993.)