Transactions of Materials and Heat Treatment

Title：Influence of high temperature diffusion on microstructure and properties of steel for railway locomotive

Authors： Yin Yinqiang Yang Yan Liu Hailiang Hu Yanhua

Unit： Department of Locomotive and Rolling Stock Baotou Railway Vocational & Technical College Teaching Department of Engineering Training Inner Mongolia University of Technology

KeyWords： 30Cr1Mo1V alloy steel high temperature diffusion heating times strip segregation grain size

ClassificationCode：TG156.2

year,vol(issue):pagenumber：2022,47(11):222-230

Abstract：

The influences of high temperature diffusion time, high temperature diffusion temperature and high temperature diffusion heating times on the microstructure and properties of 30Cr1Mo1V alloy steel for railway locomotive were studied by metallographic microscope and tensile testing machine. The results show that the experimental steel without high temperature diffusion treatment contains strip segregation, and the microstructure is tempered sorbite and white massive ferrite. After high temperature diffusion treatment, the proportion of large-size grains in the experimental steel increases and the strip segregation disappears, and the longer the high temperature diffusion time is, the larger the grain size is. When the high temperature diffusion temperature increases from 1100 ℃ to 1200 ℃, the average grain size of the experimental steel increases continuously, the microstructures at 1150 ℃ and below are tempered sorbite and a small amount of ferrite, and the strip segregation disappears. Grains with the size of 40-70 μm can be seen in the experimental steel with high temperature diffusion treatment after forging, the average grain size is larger than that of the high temperature diffusion treatment sample before forging, and there is still strip segregation in the (15,0) sample. The impact energy of the experimental steel has a certain positive correlation with the average grain size, that is, the smaller the average grain size is, the greater the impact energy is. Thus, the mechanical properties of the experimental steel with high temperature diffusion treatment meet the requirements of mechanical properties for railway locomotive steel, and the appropriate high temperature diffusion time before and after forging is 15 h.

Funds：

内蒙古自治区教育科学研究“十三五”规划课题（NZJGH2019166）；内蒙古自治区自然科学基金资助项目（2019LH05013）

作者简介：殷胤强（1986-），男，硕士，讲师，E-mail：oldsmart@21cn.com

Reference：

[1]常春青,胡运宝.风机主轴锻件锻后热处理工艺优化[J].大型铸锻件，2021，(3):43-44.

Chang C Q, Hu Y B. Optimization of heat treatment process after forging for fan spindle forgings [J]. Heavy Castings and Forgings, 2021，(3): 43-44.

[2]邱宇, 李绍伟, 曾元松, 等.热作模具钢4Cr5MoSiV1的热变形行为及本构模型修正[J]. 塑性工程学报, 2021, 28(1): 147-153.

Qiu Y, Li S W, Zeng Y S, et al. Thermal deformation behavior and modification of constitutive model of 4Cr5MoSiV1 hot working die steel[J]. Journal of Plasticity Engineering, 2021, 28(1): 147-153.

[3]郭富玉,闵娜,袁俊丰,等.扩散退火对DIEVAR钢枝晶偏析和元素分布的影响[J].材料热处理学报,2021,42(7):79-88.

Guo F Y, Min N, Yuan J F, et al. Effect of diffusion annealing on dendrite segregation and element distribution of DIEVAR steel [J]. Transactions of Materials and Heat Treatment, 2021,42 (7): 79-88.

[4]He S, Li C S, Ren J Y, et al. Investigation on alloying element distribution in Cr8Mo2SiV cold-work die steel ingot during homogenization[J]. Steel Research International, 2018, 89(10): 148-153.

[5]康爱军,郭强,顾容,等.高温扩散退火对3Cr2NiMnMo钢大型模块组织和硬度均匀性的影响[J].机械工程材料,2010,34(12):40-44.

Kang A J, Guo Q, Gu R, et al. Effect of high temperature diffusion annealing on microstructure and hardness uniformity of large-size die block of 3Cr2NiMnMo steel [J]. Materials for Mechanical Engineering, 2010,34 (12): 40-44.

[6]逯志方,苑希现,王伟,等.高温扩散对轴承钢低倍组织和碳化物不均匀性的影响[J].钢铁研究学报, 2017, 29(2):144-149.

Lu Z F, Yuan X X，Wang W, et al. Influence of high-temperature diffusion on macrostructure and carbide heterogeneity of bearing steel [J]. Journal of Iron and Steel Research, 2017, 29 (2): 144-149.

[7]Prudnikov A, Popova M, Prudnikov V. Influence of thermal cyclic deformation and hardening heat treatment on the structure and properties of steel 10[J]. Applied Mechanics and Materials, 2015, 788:187-193.

[8]GB/T 228.1—2021,金属材料拉伸试验第1部分:室温试验方法[S].

GB/T 228.1—2021,Metallic materials—Tensile testing—Part 1: Test method at room temperature[S].

[9]GB/T 229—2020,金属材料夏比摆锤冲击试验方法[S].

GB/T 229—2020,Metallic materials—Charpy pendulum impact test[S].

[10]Ma D S, Zhou J, Chen Z Z, et al. Influence of thermal homogenization treatment on structure and impact toughness of H13 ESR steel[J]. Journal of Iron and Steel Research, International，2009, 16(5): 56-60.

[11]陈柯勋,王晓毅,王飞.高温扩散时间对4Cr5MoSiV1钢组织及共晶碳化物的影响[J].热加工工艺,2018,47(20):239-242.

Chen K X, Wang X Y, Wang F. Effects of high temperature diffusion time on microstructure and eutectic carbides of 4Cr5MoSiV1 steel [J]. Hot Working Technology, 2018,47 (20): 239-242.

[12]Lasek S, Mazancová E. Influence of thermal treatment on structure and corrosion properties of high manganese triplex steels[J]. Metalurgija, 2013, 52(4):441-444.

[13]Qi Y F, Li J, Shi C B. Characterization on microstructure and carbides in an austenitic hot work die steel during ESR solidification process[J]. ISIJ International, 2018, 58(11): 2079-2087.

[14]刘鑫刚,陈欢,金淼,等. 汽轮机转子锻件高温扩散退火工艺的试验研究[J].中国机械工程, 2015, 26(1):92-97.

Liu X G, Chen H, Jin M, et al. Experimental research on high-temperature diffusion annealing process of steam turbine rotor forgings [J]. China Mechanical Engineering, 2015, 26 (1): 92-97.

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