Effect of Long-term Aging on Microstructure and Mechanical Properties of 20Cr1Mo1VTiB Bolt Steel

doi:10.11901/1005.3093.2019.361

Chinese Journal of Materials Research

2020, Vol. 34

Issue (5): 321-327 DOI: 10.11901/1005.3093.2019.361

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Effect of Long-term Aging on Microstructure and Mechanical Properties of 20Cr1Mo1VTiB Bolt Steel

ZHAO Mengya¹, PENG Tao¹, ZHAO Jiqing², YANG Gang², YANG Bin¹(

)

1.Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
2.Institute for Special Steels, Central Iron & Steel Research Institute, Beijing 100081, China

Cite this article:

ZHAO Mengya, PENG Tao, ZHAO Jiqing, YANG Gang, YANG Bin. Effect of Long-term Aging on Microstructure and Mechanical Properties of 20Cr1Mo1VTiB Bolt Steel. Chinese Journal of Materials Research, 2020, 34(5): 321-327.

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Abstract

The 20Cr1Mo1VTiB bolt steel was aged at 500℃ for 0~2000 h and then the effect of long-term aging on microstructure and mechanical properties were investigated by means of TEM, SEM, XRD, tensile- and impact-tester. Results show that the lath bainite in the steel was divided into several packets during the aging process. The size of the bainite package in the steel decreased from 13 μm before aging to 9 μm after aged for 2000 h. The main precipitates VC and TiC in the steel dispersed in the intragranular, lath boundaries and inside lath bainite after the aging process. TiC changed from a long strip to a square shape with an extension of the aging time. The boundary of bainite slabs gradually blurred with the increase of aging time, and the width of lath increased obviously after 2000 h aging. After aging for 2000 h the 20Cr1Mo1VTiB bolt steel still has high strength and toughness, therefore, which is suitable for long term service at high temperature.

Key words: metallic materials diffusion strengthening long-term aging tensile property

Received: 19 July 2019

ZTFLH:

TG142.1

Fund: High Technology Research and Development Program of China(2016YFB0300203)

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	Mengya ZHAO
	Tao PENG
	Jiqing ZHAO
	Gang YANG
	Bin YANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.361 OR https://www.cjmr.org/EN/Y2020/V34/I5/321

Table 1 Chemical composition of the 20Cr1Mo1VTiB bolt steel (mass fraction, %)

Fig.1 The microstructures of 20Cr1Mo1VTiB bolt steel after quenching at 1030℃ for 1 h, and then oil cooling (a) 1030℃×1 h quenching and then oil cooling+720℃×2 h tempering and air cooling; (b) 1030℃×1 h quenching and then oil cooling

Fig.4 Analysis of precipitates in the 20Cr1Mo1VTiB bolt steel aged for different times. (a) XRD ^{pattern of precipitates; (b) Elements in the precipitates as a function of aging time; (c) An ^{enlarged view of the parts in Figure 4 (b)}}

Fig.5 Morphologies and energy spectra of precipitates in the 20Cr1Mo1VTiB bolt steel after aging for 2000 h (a) Ellipsoidal VC and its diffraction pattern; (b) Energy spectrum analysis of VC; (c) Square TiC and its diffraction pattern; (d) TiC energy spectrum analysis; (e) TiC morphology

Fig.6 Phase diagram of the 20Cr1Mo1VTiB bolt steel

Fig.7 TEM analysis of precipitates in the 20Cr1Mo1VTiB bolt steel treated for different aging times (a)、(b) 0 h; (c)、(d) 1000 h; (e)、(f) 2000 h

Fig.8 Effect of aging time on mechanical properties in the 20Cr1Mo1VTiB bolt steel (a) Tensile strength at 500℃; (b) impact toughness at -20℃

Table 2 Execution standards for mechanical properties of the 20Cr1Mo1VTiB bolt steel

[1]	Wang X, Li Y, Li H, et al. Effect of long-term aging on the microstructure and mechanical properties of T23 steel weld metal without post-weld heat treatment [J]. J. Mater. Process. Tech. 2018, 252: 618
[2]	Gong X T, Wu Z G, Li X, et al. Effect of heat treatment process on microstructure and properties of 20Cr1Mo1VTiB bolt steel [J]. Iron Steel., 2018, 53(12): 105
	(龚雪婷，武志广，李鑫等. 热处理工艺对20Cr1Mo1VTiB螺栓钢组织及性能的影响 [J]. 钢铁. 2018, 53(12): 105)
[3]	Zieliński A, Golański G, Sroka M. Influence of long-term ageing on the microstructure and mechanical properties of T24 steel [J]. Mater. Sci. Eng. A., 2017, 682: 664
[4]	Zieliński A, Golański G, Sroka M, et al. Influence of long-term service on microstructure, mechanical properties, and service life of HCM12A steel [J]. Mater. High Temp. 2016, 33(1): 24
[5]	Guo X F, Jia X K, Gong J M, et al. Effect of long-term aging on microstructural stabilization and mechanical properties of 20Cr32-Ni1Nb steel [J]. Mater. Sci. Eng. A.,2017, 690: 62
[6]	Chen C Y, Yen H W, Kao F H, et al. Precipitation hardening of high-strength low-alloy steels by nanometer-sized carbides [J]. Mater. Sci. Eng. A, 2009, 499(1-2): 162
[7]	Huang S, He Y W, Xu G H, et al. Effects of vanadium on microstructure and mechanical properties of a wrought nickel-based superalloy [J]. Chinese Journal Material Research, 2019, 33(6): 419
	(黄烁，贺玉伟，胥国华等. V元素对铁镍基变形高温合金GH4061组织和性能的影响 [J]. 材料研究学报, 2019, 33(6): 419)
[8]	Ni Z F, Xue F. High temperature creep characteristics of in-situ micro-/nano-meter TiC dispersion strengthened 304 stainless steel [J]. Chinese Journal of Materials Research, 2019, 33(4): 306
	(倪自飞，薛烽. 原位微米/纳米TiC颗粒弥散强化304不锈钢的高温蠕变特性 [J]. 材料研究学报, 2019, 33(4): 306)
[9]	Feng J W, Niu M C, Wang W, et al. Relationship between mechanical behavior and microstructure for an ultra-high strength maraging steel [J]. Chinese Journal of Materials Research, 2019, 33(9): 641
	(冯家伟，牛梦超，王威等. 超高强度马氏体时效钢的力学行为与微观组织演化的关系 [J]. 材料研究学报, 2019, 33(9): 641)
[10]	Zhang C, Wang Q, Ren J, et al. Effect of microstructure on the strength of 25CrMo48V martensitic steel tempered at different temperature and time [J]. Materials & Design (1980-2015. 2012, 36: 220
[11]	Zhu M, Wang D, Xuan F. Effect of long-term aging on microstructure and local behavior in the heat-affected zone of a Ni-Cr-Mo-V steel welded joint [J]. Mater. Charact. 2014, 87: 45
[12]	Wei F G, Tsuzaki K. Quantitative analysis on hydrogen trapping of TiC particles in steel [J]. Metall. Mater. Trans. A., 2006, 37(2): 331
[13]	Jang J H, Lee C, Heo Y, et al. Stability of (Ti, M)C (M=Nb, V, Mo and W) carbide in steels using first-principles calculations [J]. Acta Mater. 2012, 60(1): 208
[14]	Han Y, Shi J, Xu L, et al. TiC precipitation induced effect on microstructure and mechanical properties in low carbon medium manganese steel [J]. Mater. Sci. Eng. A., 2011, 530: 643
[15]	Jang J H, Lee C, Han H N, et al. Modelling coarsening behaviour of TiC precipitates in high strength, low alloy steels [J]. Mater. Sci. Tech.-Lond. 2013, 29(9): 1074 doi: 10.1179/1743284713Y.0000000254
[16]	Tsai S, Jen C, Yen H, et al. Effects of interphase TiC precipitates on tensile properties and dislocation structures in a dual phase steel [J]. Mater. Charact. 2017, 123: 153
[17]	Wang X P, Zhao A m, Zhao Z Z, et al. Interphase precipitation strengthening in Ti-Mo low carbon ultra-high strength steel [J]. J. Eng. Sci., 2014, (9): 1183
	(汪小培，赵爱民，赵征志等. Ti-Mo低碳超高强钢中相间析出强化 [J]. 工程科学学报, 2014, (9): 1183)

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