蔡新宇,熊伟,白云飞,张小磊,高占勇

• 1:内蒙古科技大学材料科学与工程学院
• 2:内蒙古自治区新金属材料重点实验室
• 3:陆军装备部驻包头地区某单位
• 4:中国兵器工业集团内蒙古北方重工业集团有限公司

摘要(Abstract)：

为消除20Si2MnCrNi高强钢锻造后出现的严重混晶现象，采用扫描电镜(SEM)、高温激光共聚焦显微镜(HT-LSCM)和电子背散射衍射(EBSD)技术等研究了亚临界正火工艺对实验钢混晶组织均匀细化的作用机理及对其力学性能的影响。结果表明：经亚临界正火处理后，实验钢锻态组织的晶粒尺寸显著细化且分布均匀性明显改善，平均晶粒尺寸由初始混晶态的5级细化至9.5级，冲击吸收能量提升约45%,而抗拉强度仅轻微下降2%;原位观察结果表明，在亚临界正火过程中，原始粗大晶粒通过渐进式转变分解为多个细小晶粒，且再结晶晶粒优先在晶界处形核；EBSD分析表明，经亚临界正火处理后，试样的平均位错密度显著降低，大角度晶界比例从61.2%提升至70.5%,原始奥氏体组织的再结晶面积分数显著增加；机理分析表明，锻态组织中围绕小角度晶界分布的高密度位错为再结晶提供了主要形核驱动力，通过亚临界正火过程中发生的再结晶转变，成功将小角度晶界转化为大角度晶界，从而实现晶粒细化与组织均匀化的协同调控，为解决混晶组织问题提供了有效的工艺方案。

关键词(KeyWords)： 亚临界正火;混晶组织;原位观察;晶粒细化

Abstract:

Keywords:

基金项目(Foundation): 中央引导地方科技发展资金项目(2024ZY0071);; 鄂尔多斯市重点研发计划(YF20232333)

作者(Author): 蔡新宇,熊伟,白云飞,张小磊,高占勇

DOI: 10.13289/j.issn.1009-6264.2025-0041

参考文献(References)：

• [1] 陶新刚.超超临界汽轮机高中压转子X12CrMoWVNbN10-1-1钢热处理过程中显微组织演变与力学性能的研究[D].上海：上海交通大学，2015.TAO Xin-gang.Studies on microstructure evolution and mechanical properties for ultra-supercritical steam turbine high/intermediate pressure rotor X12CrMoWVNbN10-1-1 steel[D].Shanghai:Shanghai Jiao Tong University,2015.
• [2] 孙建亮，张永振，彭艳，等.大型筒节2.25Cr-1Mo-0.25V钢的组织遗传及轧后冷却控制[J].材料热处理学报，2015,36(11):250-256.SUN Jian-liang,ZHANG Yong-zhen,PENG Yan,et al.Structure heredity and controlled cooling after rolling of heavy cylinder 2.25Cr-1Mo-0.25V steel[J].Transactions of Materials and Heat Treatment,2015,36(11):250-256.
• [3] 杨洪波，李昊玥，赵贺然，等.晶粒形态对Ti-Mo钢耐蚀性能的影响[J].材料热处理学报，2024,45(11):158-166.YANG Hong-bo,LI Hao-yue,ZHAO He-ran,et al.Effect of grain morphology on corrosion resistance of Ti-Mo steel[J].Transactions of Materials and Heat Treatment,2024,45(11):158-166.
• [4] 李世文，熊伟，张文亮，等.20Si2Mn2CrNi钢锻后晶粒细化及强韧性提升工艺[J].金属热处理，2023,48(7):157-161.LI Shi-wen,XIONG Wei,ZHANG Wen-liang,et al.Grain refinement and strength-toughness improvement process of 20Si2Mn2CrNi steel after forging[J].Heat Treatment of Metals,2023,48(7):157-161.
• [5] Zhang Y,Yang J,Xiao D,et al.Effect of quenching and tempering on mechanical properties and impact fracture behavior of low-carbon low-alloy steel[J].Metals,2022,12(7):1087.
• [6] Liang G,Tan Q,Liu Y,et al.Effect of cooling rate on microstructure and mechanical properties of a low-carbon low-alloy steel[J].Journal of Materials Science,2021,56(5):3995-4005.
• [7] Huang L,Liu J,Deng X,et al.Achieving high plasticity and high toughness of low-carbon low-alloy steel through intercritical heat treatment[J].Metals,2023,13(10):1737.
• [8] Kang M,Park M,Kim B,et al.Effect of heat treatment on microstructure and mechanical properties of high-strength steel for in hot forging products[J].Metals,2021,11(5):768.
• [9] 吴忠潮，周拥军，段宝玉，等.20Si2Mn2CrNi钢Ms点下的等温转变组织及其强韧性[J].金属热处理，2023,48(7):15-21.WU Zhong-chao,ZHOU Yong-jun,DUAN Bao-yu,et al.Isothermal microstructure and strength and toughness of 20Si2Mn2CrNi steel below Ms[J].Heat Treatment of Metals,2023,48(7):15-21.
• [10] 徐月，刘建生.基于混晶评价的大锻件热锻晶粒组织演变[J].塑性工程学报，2024,31(6):103-112.XU Yue,LIU Jian-sheng.Evolution of grain structure in hot forging of large forgings based on mixed grain evaluation[J].Journal of Plasticity Engineering,2024,31(6):103-112.
• [11] 陈玉波，王培杰，原海瑞，等.正火温度对G18CrMo2-6铸钢微观组织及力学性能的影响[J].金属热处理，2024,49(1):137-141.CHEN Yu-bo,WANG Pei-jie,YUAN Hai-rui,et al.Effect of normalizing temperature on microstructure and mechanical properties of G18CrMo2-6 cast steel[J].Heat Treatment of Metals,2024,49(1):137-141.
• [12] Lu S,Wan L,Zheng S,et al.Effect of austenitizing temperature on martensitic transformation in SA508Gr.4N steel[J].Journal of Materials Science and Technology,2024,186:244-255.
• [13] 史术华，高擎，钱亚军.低温回火对低碳马氏体超高强钢组织及力学性能的影响[J].矿冶工程，2023,43(6):174-178.SHI Shu-hua,GAO Qing,QIAN Ya-jun.Effect of low-temperature tempering on microstructure and mechanical properties of low-carbon martenstic ultra-high strength steel[J].Mining and Metallurgical Engineering,2023,43(6):174-178.
• [14] 王冬晨，李晓源，韦丽金，等.回火温度对高碳钢断裂韧性的影响[J].钢铁研究学报，2017,29(6):494-499.WANG Dong-chen,LI Xiao-yuan,WEI Li-jin,et al.Effect of tempering temperature on fracture toughness of high carbon steel[J].Journal of Iron and Steel Research,2017,29(6):494-499.
• [15] Bansal G K,Tripathy S,Chandan A K,et al.Influence of quenching strategy on phase transformation and mechanical properties of low alloy steel[J].Materials Science and Engineering A,2021,826:141937.
• [16] Li J,Xu Y,Lu B,et al.Improvement of strength-ductility combination in ultra-high-strength medium-Mn Q&P steel by tailoring the characteristics of martensite/retained austenite constituents[J].Journal of Materials Research and Technology,2022,18:352-369.
• [17] 李振江，肖纳敏，李殿中，等.G18CrMo2-6钢回火组织及冲击韧性研究[J].金属学报，2014,50(7):777-786.LI Zhen-jiang,XIAO Na-min,LI Dian-zhong,et al.Influence of microstructure on impact toughness of G18CrMo2-6 steel during tempering[J].Acta Metallurgica Sinica,2014,50(7):777-786.
• [18] 刘晓明，李辉，吴冰冰，等.高强塑积Q&P钢中的残留奥氏体演变规律及力学性能[J].材料热处理学报，2024,45(12):150-158.LIU Xiao-ming,LI Hui,WU Bing-bing,et al.Evolution law of retained austenite and mechanical properties of high strength-ductility Q&P steel[J].Transactions of Materials and Heat Treatment,2024,45(12):150-158.
• [19] Geng J,Li Y,Xiao H,et al.Study fatigue crack initiation in TiB2/Al-Cu-Mg composite by in-situ SEM and X-ray microtomography[J].International Journal of Fatigue,2021,142:105976.
• [20] Bui T P,Miyashita Y,Mutoh Y,et al.Fatigue crack deflection and branching behavior of low carbon steel under mechanically large grain condition[J].International Journal of Fatigue,2021,148:106217.
• [21] Liang C,Song G,Wang W,et al.In situ observation of the austenite to ferrite transformation in low-carbon steels from different initial phases at defined cooling rates[J].Journal of Materials Research and Technology,2024,28:2116-2126.
• [22] Ali N,Zhang L,Zhou H,et al.Elucidation of void defects by soft reduction in medium carbon steel via EBSD and X-ray computed tomography[J].Materials & Design,2021,209:109978.
• [23] Humphreys F J,Kalu P N.Dislocation-particle interactions during high temperature deformation of two-phase aluminium alloys[J].Acta metallurgica,1987,35:2815-2829.
• [24] 徐世光.7Mo超级奥氏体不锈钢再结晶与应变诱导析出研究[D].北京：北京科技大学，2024.XU Shi-guang.Recrystallization and strain-induced precipitation of 7Mo super-austenitic stainless steel[D].Beijing:University of Science and Technology Beijing,2024.
• [25] 炊鹏飞，程尊鹏，李春梅，等.轧制态TiZrNbSn合金的再结晶行为[J].材料热处理学报，2024,45(8):204-212.CHUI Peng-fei,CHENG Zun-peng,LI Chun-mei,et al.Recrystallization behavior of rolled TiZrNbSn alloy[J].Transactions of Materials and Heat Treatment,2024,45(8):204-212.
• [26] 陈才，邓开霞.冷拔高碳钢丝回火抗拉强度损失研究[J].金属制品，2019,45(4):24-25.CHEN Cai,DENG Kai-xia.Study on tempering tensile strength loss of cold drawn high carbon steel wire[J].Metal Products,2019,45(4):24-25.
• [27] Guglielmi P O,Ziehmer M,Lilleodden E T.On a novel strain indicator based on uncorrelated misorientation angles for correlating dislocation density to local strength[J].Acta Materialia,2018,150:195-205.
• [28] Hadadzadeh A,Mokdad F,Wells M A,et al.A new grain orientation spread approach to analyze the dynamic recrystallization behavior of a cast-homogenized Mg-Zn-Zr alloy using electron backscattered diffraction[J].Materials Science and Engineering A,2018,709:285-289.
• [29] Xu S,Zhang H,Xiao N,et al.Mechanisms of macrozone elimination and grain refinement of near α Ti alloy via the spheroidization of the Widmannst?tten structure[J].Acta Materialia,2023,260:119339.

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