Effect of heat treatment and cooling process on microstructure and properties of bainitic steel tie-rods

doi:10.13251/j.issn.0254-6051.2021.07.034

Abstract

Abstract: The effects of heat treatment and cooling process on the microstructure and mechanical properties of the bainitic steel tie-rod with 70 mm in diameter were studied. The results show that the structure of the rod is bainite ferrite and residual austenite when heated at 920 ℃ and air cooled, and then tempered at 300 ℃, or heated at 920 ℃, water cooled for 30 s and air cooled, and then tempered at 300 ℃. The structure of the rod body is tempered lath martensite and retained austenite when heated at 920 ℃, water cooled and then tempered at 200 ℃. At half radius of the bar after water cooling at 920 ℃ and tempering at 200 ℃, R_m is 1513 MPa, KV₂ is 73.2 J, hardness is 46.5 HRC; after water-cooling for 30 s and air cooling at 920 ℃ and tempering at 300 ℃, R_m is 1254 MPa, KV₂ is 76.0 J, hardness is 42.0 HRC; after air cooling at 920 ℃ and tempering at 300 ℃, R_m is 1226 MPa, KV₂ is 75.5 J and hardness is 41.9 HRC. When the ø70 mm bainitic steel tie rod is actually normalized, the impact toughness can be improved by water-cooling before air-cooling.

Key words: cooling mode, bainite steel rod, microstructure, property

CLC Number:

TG142.1

Li Mengge, Cheng Juqiang, Yin Sibo. Effect of heat treatment and cooling process on microstructure and properties of bainitic steel tie-rods[J]. Heat Treatment of Metals, 2021, 46(7): 178-181.

References

[1] 石伟, 彭春阳, 邹全. 桥梁用钢拉杆性能研究[J]. 预应力技术, 2014(1): 11-18.
Shi Wei, Peng Chunyang, Zou Quan. Study on properties of steel tie rod for bridge[J]. Prestress Technology, 2014(1): 11-18.
[2] 杨建国, 叶建国, 祁海珅, 等. 高强度建筑钢拉杆的应用与研究[J]. 钢结构, 2005, 20(5): 26-28.
Yang Jianguo, Ye Jianguo, Qi Haishen, et al. Technical application and investigation of the high strength constructional steel tie rod[J]. Steel Construction, 2005, 20(5): 26-28.
[3] 孙维连, 杨钰瑛. 35CrMo钢拉杆显微组织与性能[J]. 金属热处理, 2005, 30(11): 79-82.
Sun Weilian, Yang Yuying. Microstructure and properties of pulling pole of 35CrMo steel[J]. Heat Treatment of Metals, 2005, 30(11): 79-82.
[4] 程晔锋, 程巨强, 冯熠婷. 回火温度对高强无碳化物贝氏体钢无缝管组织和性能的影响[J]. 金属热处理, 2020, 45(11): 201-204.
Cheng Yefeng, Cheng Juqiang, Feng Yiting. Effect of tempering temperature on microstructure and properties of high strength carbide-freebainitic steelseam lesspipe[J]. Heat Treatment of Metals, 2020, 45(11): 201-204.
[5] 笪光杰, 杨忠民, 李立新, 等. Si-Mn-Mo 系低碳贝氏体钢的连续冷却转变曲线及组织特征[J]. 金属热处理, 2019, 44(2): 16-24.
Da Guangjie, Yang Zhongmin, Li Lixin, et al. Continuous cooling transformation curves and microstructure of Si-Mn-Mo low carbon bainitic steel[J]. Heat Treatment of Metals, 2019, 44(2): 16-24.
[6] Young H, Bhadeshia H. Strength of mixtures of bainite and martensite[J]. Materials Science and Technology, 1994, 10(3): 209-214.
[7] 谭若兵, 陈大明, 康沫狂. 准贝氏体组织的强化特征[J]. 兵器材料科学与工程, 1991(7): 26-29.
Tan Ruobing, Chen Daming, Kang Mokuang. Strengthening characteristics of meta-bainite microstructure[J]. Ordnance Material Science and Engineering, 1991(7): 29-29
[8] 潘红波, 田亚强, 张明山, 等. 低碳硅锰钢奥氏体区形变对贝氏体组织及力学性能影响[J]. 金属热处理, 2017, 42(8): 102-105.
Pan Hongbo, Tian Yaqiang, Zhang Mingshan, et al. Effect of austenite deformation on bainite microstructure and mechanical properties of low carbon Si-Mn steel[J]. Heat Treatment of Metals, 2017, 42(8): 102-105.
[9] 田亚强, 田耕, 郑小平, 等. 淬火配分贝氏体钢不同位置残留奥氏体C、Mn元素表征及其稳定性[J]. 金属学报, 2019, 55(3): 332-340.
Tian Yaqiang, Tian Geng, Zheng Xiaoping, et al. C and Mn elements characterization and stability of retained austenite in different locations of quenching and partitioning bainite steels[J]. Acta Metallurgica Sinica, 2019, 55(3): 332-340.
[10] 王明明, 龙海洋, 肖亚茹, 等. 高强度贝氏体钢中的残余奥氏体(Ⅰ)[J]. 材料热处理学报, 2019, 40(10): 1-12.
Wang Mingming, Long Haiyang, Xiao Yaru, et al. Retained austenite in high-strength bainitic steels (I)[J]. Transactions of Materials and Heat Treatment, 2019, 40(10): 1-12.

[1]	Wang Yudai, Liu Yang, Zhu Yanyan, Tian Xiangjun, Cheng Xu, Ran Xianzhe, Qian Tingting. Effect of heat treatment on microstructure homogeneity and tensile properties of hybrid fabricated AerMet100 ultra-high strength steel [J]. Heat Treatment of Metals, 2022, 47(4): 1-9.
[2]	Zhang Ziyan, Chen Jun, Chen Xiaoya, Li Quan'an, Liu Jianxin. Effect of solution and aging treatment on microstructure and corrosion resistance of Mg-4Sm-3Gd-0.5Zr alloy [J]. Heat Treatment of Metals, 2022, 47(4): 10-16.
[3]	Liang Enpu, Xu Le, Yang Yong, Wang Maoqiu. Effects of Al and Cu additions on microstructure and mechanical properties of 40CrNi3MoV steel [J]. Heat Treatment of Metals, 2022, 47(4): 17-23.
[4]	Qi Xiaoliang, Li Yan, Ding Wei, Zhao Zengwu. Effect of original microstructure of medium manganese TRIP steel containing Al on microstructure and mechanical properties after intercritical annealing [J]. Heat Treatment of Metals, 2022, 47(4): 24-29.
[5]	Chen Baoan, Zhang Jingyuan, Zhu Zhixiang, Han Yu, Pan Xuedong, Zhang Lei, Chen Suhong. Effect of chemical composition on microstructure and properties of high strength Al-Mg-Si alloy [J]. Heat Treatment of Metals, 2022, 47(4): 30-38.
[6]	Chen Dongjun, Li Guangyang, Liu Gang. Effect of aging treatment on microstructure and mechanical properties of AlSi9Cu3 HPDC aluminum alloy [J]. Heat Treatment of Metals, 2022, 47(4): 53-56.
[7]	Chen Liansheng, Zhang Luyou, Tian Yaqiang, Yang Zixuan, Li Hongbin, Pan Hongbo, Wei Yingli. CCT curves and microstructure and properties of low-carbon high strength marine steel [J]. Heat Treatment of Metals, 2022, 47(4): 63-68.
[8]	Jia Changyuan, Huo Yuanming, He Tao, Huo Cunlong, Liu Keran. High temperature tensile deformation behavior and microstructure evolution law of 40CrNiMo steel [J]. Heat Treatment of Metals, 2022, 47(4): 69-74.
[9]	Wang Yunlong, Yu Wei, Zhang Yi, Shi Jiaxin, Li Minghui. Effect of austenitizing temperature on isothermal transformation and mechanical properties of bainite steel [J]. Heat Treatment of Metals, 2022, 47(4): 80-85.
[10]	Chen Sijun , Chen Songyi, Chen Geng, Yuan Dingling, Chen Kanghua. Effect of Mg content on microstructure and mechanical properties of 2A14 aluminum alloy [J]. Heat Treatment of Metals, 2022, 47(4): 86-92.
[11]	Liu Liyan, Bi Wenzhen, Wei Xicheng. Effect of Mn element on microstructure evolution of galvanized coating of hot stamping steel [J]. Heat Treatment of Metals, 2022, 47(4): 93-99.
[12]	Bai Qingqing, Zhang Zhihong, Zheng Huaibei, Wang Yinghu. Precipitation behavior of σ phase in 2507 super duplex stainless steel [J]. Heat Treatment of Metals, 2022, 47(4): 108-115.
[13]	Chen Gang, Luo Xiaobing, Chai Feng, Yang Caifu, Zhang Zhengyan, Yang Li. Influence of rolling heating temperature on microstructure and impact property of a high strength low alloy steel [J]. Heat Treatment of Metals, 2022, 47(4): 116-121.
[14]	Fu Xibin, Chen Zihao, Zhang Ke, Zhao Shiyu, Sun Xinjun, Zhu Zhenghai, Liang Xiaokai, Yong Qilong. Effect of quenching temperature on microstructure and mechanical properties of high Ti low alloy wear-resistant steel [J]. Heat Treatment of Metals, 2022, 47(4): 122-127.
[15]	Su Pengji, Ma Yonglin, Dong Lili, Yang Xuefeng. Effect of magnetic field pre-annealing on microstructure and texture of CGO steel [J]. Heat Treatment of Metals, 2022, 47(4): 128-132.