李若浩,王中成,梁恩溥,何肖飞,徐乐

• 1:钢铁研究总院有限公司特殊钢研究院
• 2:内蒙古北方重工业集团有限公司

摘要(Abstract)：

为了进一步提高25Cr3Mo3NiNbZr钢的室温力学性能，对其进行成分优化，设计制备了25CrMo3NiTiVNbZr钢。利用场发射扫描电镜(SEM)、透射电镜(TEM)、电子背散射衍射(EBSD)技术以及拉伸试验机等研究了两种试验钢经1050℃淬火及640℃回火2 h后的室温力学性能、析出相特征和强化机理。结果表明：25Cr3Mo3NiNbZr钢主要析出相为纺锤状富Mo的M_2C相，其平均直径为18 nm, 25CrMo3NiTiVNbZr钢中析出了更加细小的M_2C和MC碳化物，其平均直径为7.93 nm。25CrMo3NiTiVNbZr钢的室温抗拉强度达到1412 MPa,屈服强度达到1279 MPa,相比25Cr3Mo3NiNbZr钢分别提高了283和336 MPa。通过理论计算，两种试验钢室温下的强化机制均以析出强化、细晶强化和位错强化为主，其中25CrMo3NiTiVNbZr钢的位错强化增量和析出强化增量较25Cr3Mo3NiNbZr钢明显增加，分别增加了174和205 MPa。

关键词(KeyWords)： 25CrMo3NiTiVNbZr钢;成分优化;强化机制;纳米析出相

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 李若浩,王中成,梁恩溥,何肖飞,徐乐

参考文献(References)：

• [1] 杜云飞.热处理和热加工对PCrNi3MoV钢带状组织及力学性能的影响研究[D].太原：中北大学，2021.DU Yun-fei.Effects of heat treatment and hot processing on banded structure characteristics and mechanical properties of PCrNi3MoV steel[D].Taiyuan:North University of China,2021.
• [2] Wang M Q,Dong H,Hui W J,et al.Effect of heat treatment on microstructure and mechanical properties of Cr-Ni-Mo-Nb steel[J].Materials Science and Technology,2007,23(8):963-969.
• [3] 王毛球，董瀚，王琪，等.25Cr3Mo3NiNb二次硬化钢中的碳化物[J].钢铁研究学报，2003,15(6):42-46.WANG Mao-qiu,DONG Han,WANG Qi,et al.Carbides in secondary hardening steel 25Cr3Mo3NiNbZr[J].Journal of Iron and Steel Research,2003,15(6):42-46.
• [4] 王毛球，董瀚，王琪，等.25Cr3Mo3NiNb二次硬化钢冲击性能的研究[J].金属热处理，2003,28(3):14-17.WANG Mao-qiu,DONG Han,WANG Qi,et al.Impact toughness of secondary hardening steel 25Cr3Mo3NiNbZr[J].Heat Treatment of Metals,2003,28(3):14-17.
• [5] 马潇，徐乐，王毛球.25Cr3Mo3NiNbZrZr钢和PCrNi3MoV钢的耐磨性能[J].金属热处理，2019,44(10):29-35.MA Xiao,XU Le,WANG Mao-qiu.Wear resistance of 25Cr3Mo3NiNbZrZr Steel and PCrNi3MoV steel[J].Heat Treatment of Metals,2019,44(10):29-35.
• [6] Xu G,Gan X L,Ma G J,et al.The development of Ti-alloyed high strength microalloy steel[J].Materials and Design,2010,31(6):2891-2896.
• [7] 段修钢，蔡庆伍，武会宾.Ti-Mo全铁素体基微合金高强钢纳米尺度析出相[J].金属学报，2011,47(2):251-256.DUAN Xiu-gang,CAI Qing-wu,WU Hui-bin.Ti-Mo ferrite matrix micro-alloy steel with nanometer-sized precipitates[J].Acta Metallurgica Sinica,2011,47(2):251-256.
• [8] 甘晓龙.V对Ti-Mo微合金钢第二相析出行为及组织性能的影响研究[D].武汉：武汉科技大学，2019.GAN Xiao-long.Effect of V on precipitation behavior of second phase,microstructure and properties in Ti-Mo microalloyed steels[D].Wuhan:Wuhan University of Science and Technology,2019.
• [9] Mao X,Huo X,Sun X,et al.Strengthening mechanisms of a new 700 MPa hot rolled Ti-microalloyed steel produced by compact strip production[J].Journal of Materials Processing Technology,2010,210(12):1660-1666.
• [10] 张可.Ti-V-Mo复合微合金化高强度钢组织调控与强化机理研究[D].昆明：昆明理工大学，2016.ZHANG Ke.Study on microstructure tailoring and strengthening mechanisms of Ti-V-Mo complex microalloyed high strength steel[D].Kunming:Kunming University of Science and Technology,2016.
• [11] Kan L Y,Ye Q B,Wang Q H,et al.Refinement of Cu-M2C precipitates and improvement of strength and toughness by Ti microalloying in a Cu-bearing steel[J].Materials Science and Engineering A,2021,802:140678.
• [12] Wen T,Hu X,Song Y,et al.Carbides and mechanical properties in a Fe-Cr-Ni-Mo high-strength steel with different V contents[J].Materials Science and Engineering A,2013,588:201-207.
• [13] Zhang Z J,Zhang C,Huang J F,et al.Effects of vanadium content on the carbides transformation and strengthening mechanism of MPS700V hot-work die steel at room and elevated temperatures[J].Materials Science and Engineering A,2021,813:141091.
• [14] 王毛球，董瀚，王琪，等.奥氏体化对3Cr-3Mo-Nb二次硬化钢的组织和力学性能的影响[J].兵器材料科学与工程，2002,(5):9-13.WANG Mao-qiu,DONG Han,WANG Qi,et al.Effect of austenitizing on microstructures and mechanical properties of 3Cr-3Mo-Nb secondary hardening steel[J].Ordnance Material Science and Engineering,2002(5):9-13.
• [15] 张鹏程，武会宾，唐荻，等.Nb-V-Ti和V-Ti微合金钢中碳氮化物的回溶行为[J].金属学报，2007,43(7):753-758.ZHANG Peng-cheng,WU Hui-bin,TANG Di,et al.Dissolving behaviors of carbonitrides in Nb-V-Ti and V-Ti microalloying steels[J].Acta Metallurgica Sinica,2007,43(7):753-758.
• [16] 梁文，吴润，胡俊，等.加热工艺对Nb-Ti微合金化高强钢的影响[J].中南大学学报(自然科学版),2019,50(9):2063-2073.LIANG Wen,WU Run,HU Jun,et al.Effect of heating process on Nb-Ti microalloyed high strength steel[J].Journal of Central South University (Science and Technology),2019,50(9):2063-2073.
• [17] 王要利.4Cr5MoSiV1(Ti)组织性能调控及损伤机理研究[D].洛阳：河南科技大学，2020.WANG Yao-li.Regulation of microstructure and properties and damage mechanism study for 4Cr5MoSiV1(Ti)[D].Luoyang:Henan University of Science and Technology,2020.
• [18] Jang J H,Lee C H,Heo Y U,et al.Stability of (Ti,M)C (M=Nb,V,Mo and W) carbide in steels using first-principles calculations[J].Acta Materialia,2012,60(1):208-217.
• [19] 雍岐龙.钢铁材料中的第二相[M].北京：冶金工业出版社，2006.YONG Qi-long.Secondary Phases in Steels[M].Beijing:Metallurgical Industry Press,2006.
• [20] Petch N J.The orientation relationships between cementite and iron[J].Acta Crystallographica,1953,6(1):96-96.
• [21] Kim Y W,Kim J H,Hong S G,et al.Effects of rolling temperature on the microstructure and mechanical properties of Ti-Mo microalloyed hot-rolled high strength steel[J].Materials Science and Engineering A,2014,605:244-252.
• [22] 韩赟.低碳马氏体钢中(Ti,Mo)C析出行为及其强韧性研究[D].北京：钢铁研究总院，2013.HAN Yun.Investigation on the (Ti,Mo) C precipitation behavior and the mechanical properties in low carbon martensitic steels[D].Beijing:Central Iron & Steel Research Institute,2013.
• [23] 孙福玉，徐温崇.Nb-V微合金钢在(γ+α)双相区的控轧及有关强化效应的估算[J].金属学报，1986,22(1):115-122.SUN Fu-yu,XU Wen-chong.Calculation of yield strength of Nb-V microalloy steel controlled-rolled into dual-phase γ+α[J].Acta Metallurgica Sinica,1986,22(1):115-122.
• [24] Chen J,Li C,Ren J,et al.Strength and toughness of Fe-1.2Mn-0.3Cr-1.4Ni-0.4Mo-C tempered steel plate in three cooling processes[J].Materials Science and Engineering A,2019,754:178-189.
• [25] Fu J,Li G Q,Mao X P,et al.Nanoscale cementite precipitates and comprehensive strengthening mechanism of steel[J].Metallurgical and Materials Transactions A,2011,42:3797-3812.
• [26] Ding H N,Yuan Z Z,Liu T,et al.Microstructure and high-temperature tensile behavior of modified H13 steel with the addition of tungsten,molybdenum,and lowering of chromium[J].Materials Science and Engineering A,2023,866:144655.

文章评论(Comment)：