Effect of annealing process on microstructure texture and mechanical properties of 0.025C-0.326Mn steel
ZHOU Liu-tao1, PAN Hong-bo2,3, PAN Shuo2,3, WU Jie-wen2,3
1. School of Metallurgical Engineering, Anhui University of Technology, Ma′anshan 243002, Anhui, China; 2. Key Laboratory of Metallurgical Emission Reduction and Resources Recycling of Ministry of Education,Anhui University of Technology, Ma′anshan 243002, Anhui, China; 3. Anhui Province Key Laboratory of Metallurgical Engineering and Resources Recycling, Anhui University of Technology, Ma′anshan 243002, Anhui, China
Abstract：In order to optimize the strength and deep drawability of low alloy steel,continuous annealing and salt bath annealing+over-aging process were adopted in this experiment. The effects of annealing temperature and over-aging temperature on microstructure,texture evolution and mechanical properties of 0.025C-0.326Mn steel were investigated. The results show that the increase of annealing temperature promotes the transformation of α texture to γ texture. The dispersed distribution of fine carbide particles hinders grain rotation,resulting in the re-emergence and increase of {113}<110> oriented grains,affecting the genetic evolution of {111} surface texture. The over-aging process promotes the precipitation of solid solution carbon in the ferrite after annealing,and purifies the ferrite. The increase in over-aging temperature improves the elongation of the material,wherein the elongation is preferably up to 36.9%. The r value of the continuous annealing sample is preferably 1.26,however,the salt bath annealing and over-aging process increases the r value to 1.39,and the latter tensile strength meets the requirements of 500 MPa grade.
周刘涛, 潘红波, 潘烁, 吴结文. 退火工艺对0.025C-0.326Mn钢组织、织构和力学性能的影响[J]. 钢铁, 2020, 55(1): 93-100.
ZHOU Liu-tao, PAN Hong-bo, PAN Shuo, WU Jie-wen. Effect of annealing process on microstructure texture and mechanical properties of 0.025C-0.326Mn steel. Iron and Steel, 2020, 55(1): 93-100.
[1] 王存宇,杨洁,常颖,等. 先进高强度汽车钢的发展趋势与挑战[J]. 钢铁,2019,54(2):1. (WANG Cun-yu,YANG Jie,CHANG Ying,et al. Development trend and challenge of advanced high strength automobile steels[J]. Iron and Steel,2019,54(2):1.) [2] 胡宽辉,田德新,冯冠文,等. 汽车用热镀锌高强IF钢的研究进展[J]. 热加工工艺,2010,39(18):34.(HU Kuan-hui,TIAN De-xin,FENG Guan-wen,et al. Research progress of galvanized high strength interstitial-free steel used for automobile[J]. Hot Working Technology,2010,39(18):34.) [3] 邝春福,张深根,李俊,等. 烘烤硬化钢板的研究进展[J]. 材料导报,2013,27(9):92.(KUANG Chun-fu,ZHANG Shen-gen,LI Jun,et al. Research progress on bake hardenable steel sheet[J]. Materials Reports,2013,27(9):92.) [4] 潘晓倩,杨健,职建军,等. 超低碳汽车外板BH钢炼钢过程中夹杂物的演变[J]. 钢铁,2019,54(8):48. (PAN Xiao-qian,YANG Jian,ZHI Jian-jun,et al. Evolution of inclusions in steelmaking process for ultra low carbon BH auto exposed panel[J]. Iron and Steel,2019,54(8):48.) [5] 李辉,史春丽,尹红霞,等. DP780 双相钢烘烤硬化行为及微观组织演变[J]. 钢铁,2018,53(1):79. (LI Hui,SHI Chun-li,YIN Hong-xia,et al. Bake harden behavior and microstructure evolution of automotive DP780 steel[J]. Iron and Steel,2018,53(1):79.) [6] 惠亚军,潘辉,肖宝亮,等. 440 MPa级新型高强度烘烤硬化钢的组织与性能[J]. 钢铁,2018,53(10):79. (HUI Ya-jun,PAN Hui,XIAO Bao-liang,et al. Microstructure and properties of a new 440 MPa grade high strength bake hardening steel[J]. Iron and Steel,2018,53(10):79.) [7] 朱瑞琪,宋新莉,郑爱琴,等. 含磷高强IF汽车钢的应变硬化及微观结构特征[J]. 钢铁,2018,53(2):55. (ZHU Rui-qi,SONG Xin-li,ZHENG Ai-qin,et al. Strain hardening and microstructure characteristic of high strength IF bearing phosphorus steel[J]. Iron and Steel,2018,53(2):55.) [8] 于洋,惠亚军,王畅,等. 高强IF钢第二相粒子的应变诱导析出行为[J]. 中国冶金,2018,28(7):13. (YU Yang,HUI Ya-jun,WANG Chang,et al. Strain-induced precipitation behavior of second phase particles in high strength IF steel[J]. China Metallurgy,2018,28(7):13.) [9] WANG Zhi-gang,ZHAO Ai-min,ZHAO Zheng-zhi. Precipitation behavior and textural evolution of cold-rolled high strength deep drawing dual-phase steels[J]. Journal of Iron and Steel Research,International,2013,20(12):61. [10] 赵骧. 高纯超低碳深冲钢板的固溶碳含量对再结晶γ织构的影响[J]. 金属学报,1995(18):262.(ZHAO Xiang. Influence of dissolved carbon content on recrystallization γ texture in ultra-low carbon deep drawing steel with high purity[J]. Acta Metallurgica Sinica,1995(18):262.) [11] Jeong W. Effect of carbon on the plastic strain ratio of low carbon dual-phase steels[J]. Metals and Materials International,2014,20(1):49. [12] JIA J,ZHU W W,SONG X L,et al. Precipitation behavior of FeTiP in Ti-added interstitial free high strength steels[J]. Journal of Iron and Steel Research,International,2016,23(7):692. [13] Bhargava G,Patra L,Pai S,et al. A study on microstructure,texture and precipitation evolution at different stages of steel processing in interstitial free high strength steels[J]. Transactions of the Indian Institute of Metals,2017,70(3):631. [14] ZHANG J,CAO Y,JIANG G,et al. Effect of annealing temperature on the precipitation behavior and texture evolution in a warm-rolled P-containing interstitial-free high strength steel[J]. Acta Metallurgica Sinica,2014,27(3):395. [15] GUAN Xiao-jun,ZHOU Jia-juan,HU Xiao-jun,et al. Influence of texture pretreatment on cold rolling texture of ELC-BH sheet[J]. Journal of University of Science and Technology Beijing,1997,4(3):27. [16] WANG Hua,YANG Hong-lin,LI Lin,et al. Role of Mn and P in texture of bake hardening steel during heat treatment[J]. Journal of Iron and Steel Research,International,2014,21(8):781. [17] 王云平,赵小龙. 卷取温度对高强IF钢再结晶及织构的影响[J]. 中国冶金,2018,28(10):14. (WANG Yun-ping,ZHAO Xiao-long. Influence of coiling temperature on recrystallization and texture of high strength IF steel[J]. China Metallurgy,2018,28(10):14.) [18] 许令峰,潘洪波,贾明霞. 摩擦对IF钢铁素体区热轧和退火织构的影响[J]. 钢铁,2012,47(4):51.(XU Ling-feng,PAN Hong-bo,JIA Ming-xia. Influence of friction on texture of IF steel during hot rolling and annealing in ferrite region[J]. Iron and Steel,2012,47(4):51.) [19] 穆海玲,裴新华,夏小明,等. 润滑轧制工艺下热轧板的冲压性能及织构[J]. 轧钢,2008,25(6):12.(MU Hai-ling,PEI Xin-hua,XIA Xiao-ming,et al. Drawing property and texture of hot rolled strip with lubrication rolling process[J]. Steel Rolling,2008,25(6):12.) [20] HU H. Studies on the development of high-strength dual-phase steel sheets with high rm values[J]. Metallurgical Transactions A,1982,13(7):1257. [21] 李志红,任家宽,霍建生,等. 冷轧低合金高强钢再结晶和析出行为研究[J]. 东北大学学报:自然科学版,2019,40(3):339.(LI Zhi-hong,REN Jia-kuan,HUO Jian-sheng,et al. Study on recrystallization and precipitation behavior of cold-rolled low-alloy high strength steel[J]. Journal of Northeastern University:Natural Science,2019,40(3):339.) [22] Kurihara K,Hosoya Y,Nakaoka K. Effect of second phase on the r-value of dual phase sheet steel[J]. Tetsu-to-Hagané,1982,68(9):1195. [23] 程思飞,焦海涛,许云波. 薄带连铸取向Fe-6.5%Si钢形变热处理过程组织演化[J]. 钢铁研究学报,2019,31(2):148.(CHENG Si-fei,JIAO Hai-tao,XU Yun-bo. Microstructure evolution during deformation and heat treatment of strip-cast oriented Fe-6.5%Si steel[J]. Journal of Iron and Steel Research,2019,31(2):148.) [24] Mondal D K,Ray R K. Development of {111} texture during cold rolling and recrystallization of a C-Mn-V dual-phase steel[J]. Materials Science and Engineering:A,1992,158(2):147. [25] Peranio N,Li Y J,Roters F,et al. Microstructure and texture evolution in dual-phase steels:Competition between recovery,recrystallization,and phase transformation[J]. Materials Science and Engineering:A,2010,527(16/17):4161.
2020, Vol. 55 
