管线钢亚微米级夹杂物的控制及对抗HIC性能的影响
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摘要
通过添加Ti和Ti-Mg改性剂,试制了不同夹杂物组态的X70酸性环境用管线钢。利用OM和SEM分析试验钢中夹杂物的形态、尺寸、分布与成分;根据均质形核临界形核半径讨论了钢中夹杂物的形核和长大;测试了试验钢的氢致开裂(HIC)敏感性,并讨论了夹杂物对HIC敏感性的影响。结果表明:加Ti和加Ti-Mg均可以有效的在钢中产生大量细小、弥散的氧化物核心,其中加Ti试验钢中夹杂物以Al-Ti氧化物为核心,主要为大量亚微米级夹杂物和少量大尺寸不规则氧化物;而Ti-Mg试验钢中夹杂物以Al-Mg-Ti氧化物为核心,析出MnS,不易长大,夹杂物具有细小、弥散分布的特征。两种试验钢抗HIC性能均达到欧标要求,且Ti-Mg试验钢中完全没有发现氢致裂纹,这对提升试验钢抗HIC性能的效果明显。
X70 pipeline steel used in sour environment with different inclusions configuration was prepared by adding Ti and Ti-Mg modifier. The morphology, size, distribution and composition of inclusions were analyzed by OM and SEM. The nucleation and growth of inclusions in steel were discussed according to the homogeneous nucleation and critical nucleation radius. HIC susceptibility was calculated by HIC test. The effects of inclusions on the HIC susceptibility were discussed. The results show that by adding Ti and Ti-Mg modifier, a large number of small and uniform dispersed oxide cores appear in the steel, and the core of inclusions is Al-Ti oxide in adding Ti-steel, which is mainly composed of a large number of sub-micron inclusions and a small amount of large-scale irregular oxides. The core of inclusions is Al-Mg-Ti oxide in adding Ti-Mg steel,and MnS precipitates, which is hard to grow up. The inclusion has the characteristic of small size and dispersed distribution.The HIC resistance of both steels accords with European standard, and no HIC appears in adding Ti-Mg steel, which can significantly improve the HIC resistance of the steel.
X70 pipeline steel used in sour environment with different inclusions configuration was prepared by adding Ti and Ti-Mg modifier. The morphology, size, distribution and composition of inclusions were analyzed by OM and SEM. The nucleation and growth of inclusions in steel were discussed according to the homogeneous nucleation and critical nucleation radius. HIC susceptibility was calculated by HIC test. The effects of inclusions on the HIC susceptibility were discussed. The results show that by adding Ti and Ti-Mg modifier, a large number of small and uniform dispersed oxide cores appear in the steel, and the core of inclusions is Al-Ti oxide in adding Ti-steel, which is mainly composed of a large number of sub-micron inclusions and a small amount of large-scale irregular oxides. The core of inclusions is Al-Mg-Ti oxide in adding Ti-Mg steel,and MnS precipitates, which is hard to grow up. The inclusion has the characteristic of small size and dispersed distribution.The HIC resistance of both steels accords with European standard, and no HIC appears in adding Ti-Mg steel, which can significantly improve the HIC resistance of the steel.
引文
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[2]任学冲,褚武扬,李金许,等.MnS夹杂对钢中氢扩散行为的影响[J].北京科技大学学报,2007,29(2):232-236.
[3]Huang F,Li X G,Liu J,et al.Effects of alloying elements,microstructure,and inclusions on hydrogen induced cracking of X120 pipeline steel in wet H2S sour environment[J].Materials and Corrosion,2012,63(1):59-66.
[4]Kim W K,Koh S U,Yang B Y,et al.Effect of en vironmental and metallurgical factors on hydrogen induced cracking of HSLA steels[J].Corrosion Science,2008,50(12):3336-3342.
[5]Pressouyre G M,Bernstein I M.An example of the effect of hydrogen trapping on hydrogen embrittlement[J].Metallurgical Transactions A,1981,12(5):835-844.
[6]Huang F,Liu J,Deng Z J,et al.Effect of microstructure and inclusions on hydrogen induced cracking susceptibility and hydrogen trapping efficiency of X120 pipeline steel[J].Materials Science and Engineering A,2010,527(26):6997-7001.
[7]Huang F,Li X G,Liu J,et al.Hydrogen-induced cracking susceptibility and hydrogen trapping efficiency of different microstructure X80 pipeline steel[J].Journal of Materials Science,2011,46(3):715-722
[8]杨伶俐,包燕平,刘建华.钙处理对钢中非金属夹杂物变性效果分析[J].炼钢,2009,25(4):35-38.
[9]Liu C,Bhole S D.Challenges and developments in pipeline weldability and mechanical properties[J].Science and Technology of Welding and Joining,2013,18(2):169-181.
[10]尚德礼,吕春风,于广文.钛脱氧低碳钢液凝固过程中氧化物的析出和长大[J].铸造,2008,57(6):553-556.
[11]郑万,吴振华,李光强,等.Ti-Mg复合脱氧和硫含量对钢中夹杂物特征及MnS析出行为的影响[J].工程科学学报,2015,37(3):292-300.
[12]郑万,刘磊,李光强,等.Ti-Mg复合脱氧钢中夹杂物细化机制[J].工程科学学报,2015(7):8-10.
[13]Suito H,Ohta H.Characteristics of particle size distribution in early stage of deoxidation[J].ISIJ international,2006,46(1):33-41.
[14]Hsing J.Evaluation of pipeline and pressure vessel steels for resistance to hydrogen-induced cracking[J].Nature,2011(6):78-96.
[15]常开地,赵焕春,张慧峰,等.含硫非调质钢轧后硫化物夹杂形貌的观察[J].金属热处理,2006,31(9):60-64.
[16]Seok S H,Miki T,Hino M.Equilibrium between Ti and O in molten Fe-Ni,Fe-Cr and Fe-Cr-Ni alloys equilibrated with Ti3O5solid solution[J].ISIJ international,2011,51(4):566-572.
[17]Cha W Y,Nagasaka T,Miki T,et al.Equilibrium between titanium and oxygen in liquid Fe-Ti alloy coexisted with titanium oxides at 1873 K[J].ISIJ international,2006,46(7):996-1005.
[18]Pawelski O,Kaspar R.Laboratory simulation of the thermomechanical processing of steel[J].Materialprufung,1988,30(11):357-360.
[19]Zhang T,Liu C,Jiang M.Effect of Mg on behavior and particle size of inclusions in Al-Ti deoxidized molten steels[J].Metallurgical and Materials Transactions B,2009,65:1-10.
[20]Zhang T,Wang D,Liu C,et al.Modification of inclusions in liquid iron by mg treatment[J].Journal of Iron and Steel Research,International,2014,21:99-103.
[21]Kimura S,Nakajima K,Mizoguchi S.Behavior of alumina-magnesia complex inclusions and magnesia inclusions on the surface of molten low-carbon steels[J].Metallurgical and Materials Transactions B,2001,32(1):79-85.
[22]杨成威,吕迺冰,王新华,等.1873K下钢液中Ti-Al复合脱氧热力学分析及夹杂物生成[J].北京科技大学学报,2009,31(11):1390-1393.
[23]Noecker F F,Pickens G,Wilken G,et al.Test method to evaluate the effect of reeling on sour service performance of c-mn steel linepipe and girth welds[C]//The Nineteenth International Offshore and Polar Engineering Conference.International Society of Offshore and Polar Engineers,2009.