Fe-15Mn-10Al-0.3C钢升温过程中κ-碳化物的析出行为研究
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摘要
利用差示扫描量热分析法(DSC)研究了淬火态轻质Fe-15Mn-10Al-0. 3C(质量分数,%)钢在升温过程中κ-碳化物的析出行为。由DSC曲线可以发现,δ-铁素体中淬火时形成的DO3相,先转变为L1_2相,再转变为κ-碳化物。利用JMAK方法计算了δ-铁素体中κ-碳化物的析出动力学和奥氏体分解动力学。计算结果表明:DO3相向L1_2相转变的激活能为145. 25 kJ/mol,L1_2相向κ-碳化物转变的激活能为81. 18 k J/mol。此外,试验钢经600℃时效30 s后,δ-铁素体的硬度最高,此时δ-铁素体中κ-碳化物的相对体积分数约为20%。
Precipitation behavior of κ-carbides in the quenched lightweight Fe-15 Mn-10 Al-0. 3 C( mass fraction,%) steel during heating process was studied by differential scanning calorimetric( DSC) techniques. It was found from the DSC measured curves that the DO3 phase formed in quenching in δ-ferrite firstly transformed into L1_2 phase and then into κ-carbide. The precipitation kinetics of κ-carbide in δ-ferrite and the austenite decomposition kinetics were calculated using the JMAK equation. The calculated results showed that the activation energy of DO3 phase transition into L1_2 phase and L1_2 phase transition into κ-carbide were 145. 25 kJ/mol and 81. 18 kJ/mol,respectively. Besides,the hardness of δ-ferrite was the highest in test steel after aging at 600 ℃for 30 s,and the relative volume fraction of κ-carbides in δ-ferrite was about 20%.
Precipitation behavior of κ-carbides in the quenched lightweight Fe-15 Mn-10 Al-0. 3 C( mass fraction,%) steel during heating process was studied by differential scanning calorimetric( DSC) techniques. It was found from the DSC measured curves that the DO3 phase formed in quenching in δ-ferrite firstly transformed into L1_2 phase and then into κ-carbide. The precipitation kinetics of κ-carbide in δ-ferrite and the austenite decomposition kinetics were calculated using the JMAK equation. The calculated results showed that the activation energy of DO3 phase transition into L1_2 phase and L1_2 phase transition into κ-carbide were 145. 25 kJ/mol and 81. 18 kJ/mol,respectively. Besides,the hardness of δ-ferrite was the highest in test steel after aging at 600 ℃for 30 s,and the relative volume fraction of κ-carbides in δ-ferrite was about 20%.
引文
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[2]ZAEFFERER S,OHLERT J,BLECK W.A study of microstructure,transformation mechanisms and correlation between microstructure and mechanical properties of a low alloyed TRIP steel[J].Acta Materialia,2004,52(9):2765-2778.
[3]TIMOKHINA I B,HODGSON P D,PERELOMA E V.Effect of microstructure on the stability of retained austenite in transformation-induced-plasticity steels[J].Metallurgical&Materials Transactions A,2004,35(8):2331-2341.
[4]RAABE D,SPRINGER H,GUTIERREZ-URRUTIA I,et al.Alloy design,combinatorial synthesis,and microstructureproperty relations for low-density Fe-Mn-Al-C austenitic steels[J].JOM,2014,66(9):1845-1856.
[5]KIM Y G,PARK Y S,HAN J K.Low temperature mechanical behavior of microalloyed and controlled-rolled Fe-Mn-Al-C-Xalloys[J].Metallurgical Transactions A,1985,16(9):1689-1693.
[6]JAHN M T,CHANG S C,HSIAO Y H.Transverse tensile and fatigue properties of Fe-Mn-Al-C alloys[J].Journal of Materials Science,1989,8(6):723-724.
[7]KALASHNIKOV I S,ACSELRAD O,PEREIRA L C,et al.Behavior of Fe-Mn-Al-C steels during cyclic tests[J].Journal of Materials Engineering&Performance,2000,9(3):334-337.
[8]JACKSON P R S,WALLWORK G R.High temperature oxidation of iron-manganese-aluminum based alloys[J].Oxidation of Metals,1984,21(3/4):135-170.
[9]KAO C H,WAN C M.Effect of temperature on the oxidation of Fe-7.5A1-0.65C alloy[J].Journal of Materials Science,1988,23(6):1943-1947.
[10]CHOI K,SEO C H,LEE H,et al.Effect of aging on the microstructure and deformation behavior of austenite base lightweight Fe-28Mn-9Al-0.8C steel[J].Scripta Materialia,2010,63(10):1028-1031.
[11]GUTIERREZ-URRUTIA I,RAABE D.Influence of Al content and precipitation state on the mechanical behavior of austenitic high-Mn low-density steels[J].Scripta Materialia,2013,68(6):343-347.
[12]GUTIERREZ-URRUTIA I,RAABE D.High strength and ductile low density austenitic Fe Mn Al C steels:Simplex and alloys strengthened by nanoscale ordered carbides[J].Materials Science&Technology,2013,30(9):1099-1104.
[13]LIN C L,CHAO C G,JUANG J Y,et al.Deformation mechanisms in ultrahigh-strength and high-ductility nanostructured Fe Mn Al C alloy[J].Journal of Alloys&Compounds,2014,586(4):616-620.
[14]SEOL J B,RAABE D,CHOI P,et al.Direct evidence for the formation of ordered carbides in a ferrite-based low-density FeMn-Al-C alloy studied by transmission electron microscopy and atom probe tomography[J].Scripta Materialia,2013,68(6):348-353.
[15]JEONG J,LEE C Y,PARK I J,et al.Isothermal precipitation behavior ofκ-carbide in the Fe-Mn-6Al-0.15C lightweight steel with a multiphase microstructure[J].Journal of Alloys&Compounds,2013,574:299-304.
[16]RAHNAMA A,DASHWOOD R,SRIDHAR S.A phase-field method coupled with CALPHAD for the simulation of orderedκ-carbide precipitates in both disorderedγandαphases in low density steel[J].Computational Materials Science,2017,126:152-159.
[17]LU W J,QIN R S.Influence ofκ-carbide interface structure on the formability of lightweight steels[J].Materials&Design,2016,104:211-216.
[18]张巧霞,郭明星,胡晓倩,等.汽车板用Al-0.6Mg-0.9Si-0.2Cu合金时效析出动力学研究[J].金属学报,2013,49(12):1604-1610.
[19]WELSCH E,PONGE D,HAGHIGHAT S M H,et al.Strain hardening by dynamic slip band refinement in a high-Mn lightweight steel[J].Acta Materialia,2016,116:188-199.
[20]KHACHATURYAN A G,VIEHLAND D.Structurally heterogeneous model of extrinsic magnetostriction for Fe-Ga and similar magnetic alloys:Part I.Decomposition and confined displacive transformation[J].Metallurgical&Materials Transactions A,2007,38(13):2308-2316.
[21]CHENG W C,CHENG C Y,HSU C W,et al.Phase transformation of the L12phase to kappa-carbide after spinodal decomposition and ordering in an Fe-C-Mn-Al austenitic steel[J].Materials Science&Engineering A,2015,642:128-135.
[22]CONNETABLE D,MAUGIS P.First principle calculations of theκ-Fe Al C perovskite and iron-aluminium intermetallics[J].Intermetallics,2008,16(3):345-352.
[23]WANTANG F U,WANG Z,JING T,et al.A new approach to isothermal precipitation kinetics of carbides[J].Journal of Materials Science&Technology,1998,14(5):478-480.
[24]冯晶,陈敬超,于杰,等.快速凝固法制备过饱和CuCr合金时效析出动力学[J].稀有金属材料与工程,2009,38(2):281-285.
[25]刘林飞,周上祺,黄玉堂,等.C、N、O在α-Fe中扩散激活能的计算[J].材料导报,2008,22(8):120-122.