铝对稀土耐热钢中非金属夹杂物的影响

doi:10.13228/j.boyuan.issn0449-749x.20210570

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摘要稀土能够显著提升钢材的性能,是高品质钢中常见的合金元素之一。然而,由于稀土与O、S等杂质元素之间存在极强的亲和力,加入钢中后形成的高熔点、大尺寸夹杂物对浇铸工艺的顺行及产品质量均有严重危害。为了探讨不同铝含量对稀土耐热钢中非金属夹杂物类型及尺寸分布的影响,在利用优化的热力学模型进行模拟计算的基础上,设计并开展了高温试验。热力学计算结果表明,增大铝含量能够抑制钢中Ce₂O₃夹杂物的析出,同时促进CeAlO₃和Ce₂O₂S夹杂物的析出,根据钢液中Ce、Al、O及S含量的变化,总结了夹杂物转变的临界热力学条件,当铝质量分数为0.025%～0.065%时,满足w([Al])/w([Ce])为270,Ce₂O₃变质成CeAlO₃;当铝质量分数为0.065%～0.17%时,满足w([S])/w([O])为10,Ce₂O₃转变为Ce₂O₂S。试验结果表明,在铈加入量一定的情况下,随着铝质量分数在0～0.3%范围内增大,不同试验钢中典型夹杂物的变化趋势为Ce₂O₃→Ce₂O₃+CeAlO₃→CeAlO₃+Ce₂O₂S,相应地,夹杂物的平均粒径由4.69 μm降低至2.73 μm。由夹杂物类型与尺寸之间关系的统计结果可知,尺寸较小的Ce₂O₂S的形成是导致夹杂物尺寸减小的主要原因之一;适当增大稀土耐热钢的铝脱氧强度,能够通过改变夹杂物类型的方式,有效细化钢中夹杂物的尺寸,有望改善稀土耐热钢的水口结瘤问题和产品质量。

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	王野光
	刘承军
	邱吉雨

关键词 ：铝脱氧, 稀土耐热钢, 热力学计算, 夹杂物类型, 尺寸细化

Abstract：As a common alloying element in high-quality steel, rare earth is widely used to improve the properties of steel. However, due to the strong affinity between rare earth and impurity elements such as oxygen and sulfur in steel, the formation of inclusions with high melting point and large size after rare earth addition are seriously harmful to casting process and product quality. In order to investigate the effect of different Al contents on the type and size distribution of non-metallic inclusions in heat resistant steel containing rare earth, high temperature experiments were designed and carried out according to calculation by optimized thermodynamic model. The results of calculation show that increase of Al content can inhibit the precipitation of Ce₂O₃ inclusions, but promote the precipitation of CeAlO₃ and Ce₂O₂S inclusions in steel. The changes of Ce, Al, O and S in molten steel were calculated, and thereby obtaining the critical thermodynamic conditions of inclusion transformation. When w([Al]) was 0.025%-0.065%, and the w([Al])/w([Ce]) value was 270, Ce₂O₃ transformed into CeAlO₃. Ce₂O₃ converted to Ce₂O₂S with Al content ranging from 0.065% to 0.17% and w([S])/w([O]) value up to 10. The experiment results show that inclusions variation trend is Ce₂O₃→Ce₂O₃+CeAlO₃→CeAlO₃+Ce₂O₂S with the increase of mass percent of Al from 0 to 0.3% under a certain Ce amount in different test steels, and the average particle size of inclusions reduces from 4.69 μm to 2.73 μm accordingly. Based on the statistical results of relationship between inclusion type and size distribution, it is found that the formation of Ce₂O₂S with small size is one of the main cause for decrease of inclusions size. Therefore, increase of Al contents in rare earth heat-resistant steel appropriately can effectively refine the size of inclusions in steel by modifying the inclusion types, which is expected to improve the nozzle clogging problem and the product quality.

Key words： Al deoxidation heat-resistant steel containing rare earth element thermodynamic calculation inclusion type size refinement

收稿日期: 2021-09-17

引用本文:

王野光, 刘承军, 邱吉雨. 铝对稀土耐热钢中非金属夹杂物的影响[J]. 钢铁, 2022, 57(4): 52-57. WANG Ye-guang, LIU Cheng-jun, QIU Ji-yu. Effect of Al content on non-metallic inclusions in heat-resistant steel containing rare earth element[J]. Iron and Steel, 2022, 57(4): 52-57.

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[1] MA Xiao-cong,AN Zi-jun,CHEN Lei,et al. The effect of rare earth alloying on the hot workability of duplex stainless steel—A study using processing map[J]. Materials and Design,2015,86(5):848.
[2] 杨吉春,王军,任磊,等. 铈对S32550双相不锈钢微观组织及冲击性能的影响[J]. 钢铁,2020,55(1):86.(YANG Ji-chun,WANG Jun,REN Lei,et al. Effect of cerium on microstructure and impact properties of S32550 duplex stainless steel[J]. Iron and Steel,2020,55(1):86.)
[3] 张宏艳,田志红,邵肖静,等. 改质工艺对高强度低合金钢夹杂物特性的影响[J]. 中国冶金, 2021, 31(2): 31.(ZHANG Hong-yan, TIAN Zhi-hong, SHAO Xiao-jing, et al. Influence of modification processes on inclusion properties of high strength low alloy steel[J]. China Metallurgy, 2021, 31(2): 31. )
[4] 董方,蔡国君,储少军. 稀土铈对1Cr18Mn8Ni5N不锈钢力学性能的影响[J]. 钢铁,2010,45(11):82.(DONG Fang,CAI Guo-jun,CHU Shao-jun. Effect of Ce on mechanical properties of 1Cr18Mn8Ni5N stainless steel[J]. Iron and Steel,2010,45(11):82.)
[5] 习小军,杨树峰,李京社,等. 含铈304不锈钢夹杂物改性及耐腐蚀性能优化[J]. 钢铁,2020,55(1):20.(XI Xiao-jun,YANG Shu-feng,LI Jing-she,et al. Modification of cerium-containing 304 stainless steel inclusions and optimization of corrosion resistance[J]. Iron and Steel,2020,55(1):20.)
[6] 杨超云, 庄权, 刘航, 等. 稀土变质高洁净轴承钢中夹杂物的行为分析[J]. 中国冶金, 2020, 30(9): 45. (YANG Chao-yun, ZHUANG Quan, LIU Hang, et al. Analysis on modification behavior of rare earth to inclusions in highly clean bearing steel[J]. China Metallurgy, 2020, 30(9): 45. )
[7] Yu Mao-de,Sandstrom R. Influence of carbon and nitrogen content on the creep properties of the austenitic stainless steel 253MA[J]. Scandinavian Journal of Metallurgy,1988,17(4):156.
[8] 董大西, 杨超云, 胡云生, 等. 高洁净轴承钢中稀土变质夹杂物行为分析[J]. 中国冶金, 2020, 30(6): 30. (DONG Da-xi, YANG Chao-yun, HU Yun-sheng, et al. Analysis on modification behavior of rare earth to inclusions in high clean bearing steel[J]. China Metallurgy, 2020, 30(6): 30. )
[9] CHEN Lei,MA Xiao-cong,WANG Long-mei,et al. Effect of rare earth element yttrium addition on microstructures and properties of a 21Cr-11 Ni austenitic heat-resistant stainless steel[J]. Materials and Design,2011,32(4):2206.
[10] 李国平. 253MA(S30815)耐热不锈钢冶炼工艺研究[J]. 钢铁,2008,43(1):36.(LI Guo-ping. Study of heat resistance stainless steel 253MA making (S30815)[J]. Iron and Steel,2008,43(1):36.)
[11] 李阳,杜鹏飞,姜周华,等. 稀土对含铜锡铁素体不锈钢中非金属夹杂物的影响[J]. 钢铁,2018,53(10):32.(LI Yang,DU Peng-fei,JIANG Zhou-hua,et al. Effect of rare earth on nonmetallic inclusions in copper-tinbearing ferritic stainless steel[J]. Iron and Steel,2018,53(10):32.)
[12] 杨吉春,栗宏伟,周莉,等. 微量稀土铈在超洁净IF钢中的作用[J]. 钢铁,2015,50(11):81.(YANG Ji-chun,LI Hong-wei,ZHOU Li,et al. Mechanism of trace cerium in ultra-clean IF steel[J]. Iron and Steel,2015,50(11):81.)
[13] 杨晓红,吴鹏飞,吴钺川,等. 特殊钢中稀土变质夹杂物行为研究[J]. 中国稀土学报,2010,28(5):612.(YANG Xiao-hong,WU Peng-fei,WU Cheng-chuan,et al. Behavior of rare earth on modifying inclusion in special steel[J]. Journal of the Chinese Society of Rare Earths,2010,28(5):612.)
[14] 王奕,李长荣,曾泽芸,等. SWRS82B钢中稀土元素对氧化铝改性的晶体学[J].钢铁,2020,55(10):69.(WANG Yi,LI Chang-rong,ZENG Ze-yun,et al. Crystallization of alumina modified by rare earth elements in SWRS82B steel[J]. Iron and Steel,2020,55(10):69.)
[15] Bi Yan-yan,Karasev A V, Jnsson P G. Three dimensional evaluations of REM clusters in stainless steel[J]. ISIJ International,2014,54(6):1266.
[16] Appelberg J,Nakajima K,Shibata H,et al. In situ studies of misch-metal particle behavior on a molten stainless steel surface[J]. Materials Science and Engineering A,2008,495(1/2):330.
[17] Ni Pei-yuan,Jonsson L T I,Ersson M,et al. Turbulent flow phenomena and Ce₂O₃ behavior during a steel teeming process[J]. ISIJ International,2013,53(5):792.
[18] LI Hao,YU Yan-chong,REN Xiang, et al. Evolution of Al₂O₃ inclusions by cerium treatment in low carbon high manganese steel[J]. Journal of Iron and Steel Research,International,2017,24(9):925.
[19] 高建兵,常朋飞,张彬彬,等.铈对新型超级双相不锈钢2707HD夹杂物变性的影响[J].钢铁,2018,53(9):37.(GAO Jian-bing,CHANG Peng-fei,ZHANG Bin-bin,et al. Effect of Cerium on the degeneration of inclusions of new super duplex stainless steel 2707HD[J]. Iron and Steel,2018,53(9):37.)
[20] WANG Ye-guang,LIU Cheng-jun. Agglomeration characteristics of various inclusions in Al-killed molten steel containing rare earth element[J]. Metallurgical and Materials Transactions B,2020,51(6):1.
[21] Nabeel M,Karasev A V, Jnsson P G. Formation and growth mechanism of clusters in liquid REM-alloyed stainless steels[J]. ISIJ International,2016,55(11):2358.