Effect of NbC precipitates on grain growth of 17Cr2Ni2MoVNb gear steel

doi:10.13251/j.issn.0254-6051.2023.01.021

Abstract

Abstract: Pinning effect of NbC precipitates on grain size of the 17Cr2Ni2MoVNb steel at high temperature was analyzed by means of the coarsening model, the Zener grain growth model and experimental verification. The model and experimental results show that the pinning effect of NbC on grain growth is reduced due to its coarsening and re-solution. When the isothermal temperature is lower than 1000 ℃, NbC precipitate relative to the growth of austenite grains can play an effective inhibition, with the increase of isothermal temperature, the inhibition of NbC precipitation relative to the growth of austenite becomes weaker and weaker.

Key words: 17Cr2Ni2MoVNb steel, NbC precipitates, coarsening model, Zener grain growth model, grain growth

CLC Number:

TG142.1

Song Shaowei, Dong Mingzhen, Yu Wenchao, Yan Yongming, Wang Maoqiu, Zhou Yun. Effect of NbC precipitates on grain growth of 17Cr2Ni2MoVNb gear steel[J]. Heat Treatment of Metals, 2023, 48(1): 122-126.

References

[1]Ivanov A S, Grebenkov S K, Bogdanova M V. Optimization of the process of carburizing and heat treatment of low-carbon martensitic steels[J]. Metal Science and Heat Treatment, 2016, 58(1/2): 116-119.
[2]Zhang J, Li W, Wang H, et al. A comparison of the effects of traditional shot peening and micro-shot peening on the scuffing resistance of carburized and quenched gear steel[J]. Wear, 2016, 368: 253-257.
[3]Song Guangsheng, Liu Xianghua, Wang Guodong, et al. Numerical simulation on carburizing and quenching of gear ring[J]. Journal of Iron and Steel Research International, 2007, 14(6): 47-52.
[4]Bepari M M A. Carburizing: A method of case hardening of steel—Science direct[J]. Comprehensive Materials Finishing, 2017, 2: 71-106.
[5]Zeng Z, Reddy K M, Song S, et al. Microstructure and mechanical properties of Nb and Ti microalloyed lightweight δ-TRIP steel[J]. Materials Characterization, 2020, 164: 110324.
[6]胡成飞, 吴润, 尉文超, 等. 淬火温度对17Cr2Ni2MoVNb重载齿轮钢组织和硬度的影响[J]. 金属热处理, 2019, 44(10): 91-95.
Hu Chengfei, Wu Run, Yu Wenchao, et al. Effect of quenching temperature on microstructure and hardness of heavy-duty gear steel 17Cr2Ni2MoVNb[J]. Heat Treatment of Metals, 2019, 44(10): 91-95.
[7]Hang Yalong, Lai Fuqiang, Qu Shengguan, et al. Effect of ultrasonic surface rolling on microstructure and rolling contact fatigue behavior of 17Cr2Ni2MoVNb steel[J]. Surface and Coatings Technology, 2019, 366: 321-330.
[8]Qu S G, Zhang Y L, Lai F Q, et al. Effect of tempering temperatures on tensile properties and rotary bending fatigue behaviors of 17Cr2Ni2MoVNb steel[J]. Metals, 2018, 8(7): 507.
[9]Andersson J O, Helander T, Hglund L, et al. Thermo-Calc & DICTRA, computational tools for materials science[J]. Calphad-computer Coupling of Phase Diagrams and Thermochemistry, 2002, 26(2): 273-312.
[10]Maalekian M, Radis R, Militzer M, et al. In situ measurement and modelling of austenite grain growth in a Ti/Nb microalloyed steel[J]. Acta Materialia, 2012, 60(3): 1015-1026.
[11]Uhm S, Moon J, Lee C, et al. Prediction model for the austenite grain size in the coarse grained heat affected zone of Fe-C-Mn steels: Considering the effect of initial grain size on isothermal growth behavior[J]. ISIJ International, 2004, 44(7): 1230-1237.
[12]Gregory S Rohrer. “Introduction to Grains, Phases, and Interfaces—an Interpretation of Microstructure” Trans.AIME, 1948, vol.175, pp.15-51, by C.S.Smith[J]. Metallurgical and Materials Transactions B, 2010, 41(3): 457-494.
[13]Yan Biyu, Liu Yongchang, Wang Zejun, et al. The effect of precipitate evolution on austenite grain growth in RAFM steel[J]. Materials, 2017, 10(9): 10-17.
[14]Graux A, Cazottes S, Castro D D, et al. Precipitation and grain growth modelling in Ti-Nb microalloyed steels[J]. Social Science Electronic Publishing, 2019, 5: 100-233.
[15]Moon J, Kim S, Jeong H, et al. Influence of Nb addition on the particle coarsening and microstructure evolution in a Ti-containing steel weld HAZ[J]. Materials Science and Engineering A, 2007, 454: 648-653.
[16]Nagakura S, Oketani S. Structure of transition metal carbides[J]. Transactions of the Iron and Steel Institute of Japan, 1968, 8(5): 265-294.
[17]Geise J, Herzig C. Lattice and grain boundary diffusion of niobium in iron[J]. International Journal of Materials Research, 1985, 76(9): 622-626.