超级贝氏体对1.37wt.%C超高碳钢强度和韧性的影响
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摘要
研究1.37%C(质量分数)超高碳钢(UHCS-1.37C)经990℃奥氏体化,270℃和310℃等温淬火不同时间后空冷的组织和力学性能。组织研究表明,UHCS-1.37C经等温淬火热处理后获得了由纳米级贝氏体铁素体+薄膜状残余奥氏体组成的超级贝氏体组织。在同一等温温度下,随着等温时间的延长,超级贝氏体的数量不断增加,马氏体数量减少;在相同的等温时间内,等温温度越高,生成的超级贝氏体数量越多。力学测试结果表明,UHCS-1.37C在310℃等温8 h后获得了最佳的强韧性配合,其抗拉强度为1 622 MPa,断后伸长率为5.5%,冲击吸收能量为12.7 J。UHCS-1.37C等温组织优异的力学性能归因于超级贝氏体组织。
The microstructures and mechanical properties of an ultrahigh-carbon steel with 1.37 wt.%C subjected to austenitization at single γ phase region and austempering at low temperatures have been studied. The results show that a superbainite comprising lamar bainite ferrite and film-type retained austenite is generated. An impact absorbed energy of 12.7 J,a fraction strength of 1 622 MPa and an elongation of 5.5% are obtained for UHCS-1.37 C austempered at 310℃ for 8 h. The combination of excellent strength and toughness is attributed to the superbainite.
The microstructures and mechanical properties of an ultrahigh-carbon steel with 1.37 wt.%C subjected to austenitization at single γ phase region and austempering at low temperatures have been studied. The results show that a superbainite comprising lamar bainite ferrite and film-type retained austenite is generated. An impact absorbed energy of 12.7 J,a fraction strength of 1 622 MPa and an elongation of 5.5% are obtained for UHCS-1.37 C austempered at 310℃ for 8 h. The combination of excellent strength and toughness is attributed to the superbainite.
引文
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[2]OYAMA T,SHERBY O D,KUM D W,et al. Ultrahigh Carbon Steels[J].Journal of Metals,1985,37(6):50-56.
[3]Z. Jiewu,X. Yan,Y. Liu. Lath martensite in 1.4%C ultrahigh carbon steel and its grain size effect[J].Materials Science and Engineering:A,2004,385(1-2):440-444.
[4]OYAMA T,SHERBY O D. Ultra high carbon steel alloy and processing thereof:United States,4533390[P].1985-08-06.
[5]OYAMA T,SHERBY O D,WADSWORTH J. Divorced eutectoid transformation process and product of ultrahigh carbon steels:United States,4448613[P].1984-05-15.
[6]KAYALIES,SUNADAH,OYAMAT,etal.The developmentoffinestructuresuperplasticityincast ultrahigh carbon steels through thermal cycling[J]. Journal Of Materials Science,1979,14(11):2688-2692.
[7]LUOGM,WUJS,FANJF,etal.Excellent mechanicalpropertiesofaspraydepositedultrahigh carbonsteelafterhotrolling[J].JournalofMaterials Science,2004,39(14):4679-4681.
[8]刘宏基,孙俊杰,江涛,等.一种超高碳钢的滚动接触疲劳研究[J].金属学报,2014(12):1446-1452.
[9]CHEN X,LIU Y,ZHU J,et al. Tribological Behavior of 1.41 wt%C Ultrahigh-carbon Steel With Quenching and Low-temperature Tempering Treatment[J]. Tribology Letters,2010:38(1):79-86.
[10]WANG YH,ZHANGFC,WANGTS. Anovel bainitic steel comparable to maraging steel in mechanical properties[J]. Scripta Materialia,2013,68(9):763-766.
[11]JIANG T,LIU H, SUN J,et al. Effect of Austenite GrainSizeonTransformationofNanobainiteand ItsMechanicalProperties[J].MaterialsScience&Engineering,2016,A 666:207-213.
[12]ZHAO J,ZHAO T,HOU C S,et al. Improving impact toughness of high-C–Cr bearing steel by Si–Mo alloying and low-temperature austempering[J]. Materials&Design,2015,86:215–220.
[13]ZHANG Z,ZHANG K,YUE Y,et al. Microstructure andMechanicalPropertiesof AustemperedUltrahigh CarbonSteel1.4%C[J].MaterialsScienceForum,2011,682:97-101.
[14]石淑琴,陈光,傅万堂,等.Fe-1.5C-1.5Cr-2.0Al超高碳钢的等温组织及力学性能[J].天津大学学报,2007,40(5):629-633.
[15]DURNIN J,RIDAL K. Quantitative-determination of retained austenite in steel by X-ray diffraction[J]. J Iron Steel Inst,1968,206(1):60-67.
[16]DYSON D,HOLMES B. Effect of alloying additions on the lattice parameter of austenite[J]. J Iron Steel Inst,1970,208(5):469-474.
[17]CABALLERO F G,MILLER M K,GARCIA-MATEO C. Carbon supersaturation of ferrite in a nanocrystalline bainitic steel[J]. Acta Materialia,2010,58(7):2338-2343.
[18]CORNIDEJ,GARCIA-MATEO C,CAPDEVILA C,et al. An assessment of the contributing factors to the nanoscale structural refinement of advanced bainitic steels[J]. Journal of Alloys and Compounds,2013,577:S43-S47.
[19]BHADESHIA H. Nanostructured bainite,Proceedings of the Royal Society A:Mathematical[J]. Physical and Engineering Science,2009:20090407.
[20]XUG,LIUF,WANGL,etal. Anewapproachto quantitativeanalysisofbainitictransformationina superbainite steel[J]. Scripta Materialia,2013,68(11):833-836.
[21]SEOLJB,RAABED,CHOIPP,etal. Atomic scale effects of alloying,partitioning,solute drag and austempering on the mechanical properties of high-carbon bainitic–austenitic TRIPsteels[J]. ActaMaterialia,2012,60(17):6183-6199.
[22]CABALLERO F G,BHADESHIA H K D H. Very strong bainite[J]. Current Opinion in Solid State and Materials Science,2004,8(3–4):251-257.
[23]BHADESHIA H K D H,CHRISTIAN J W. Bainite in steels[J]. Metallurgical Transactions,1990,A 21(3):767-797.