Evolution of Microstructures and Mechanical Properties of Zr-Containing Y-CLAM During Thermal Aging

doi:10.1007/s40195-020-01011-5

金属学报英文版 ›› 2020, Vol. 33 ›› Issue (6): 881-891.DOI: 10.1007/s40195-020-01011-5

收稿日期:2019-08-27 修回日期:2019-10-23 出版日期:2020-06-10 发布日期:2020-06-17

Evolution of Microstructures and Mechanical Properties of Zr-Containing Y-CLAM During Thermal Aging

Dongping Zhan¹, Guoxing Qiu²^,³(), Changsheng Li², Yongkun Yang¹, Zhouhua Jiang¹, Huishu Zhang⁴

¹School of Metallurgy, Northeastern University, Shenyang, 110819, China
²State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, China
³School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China
⁴School of Metallurgy Engineering, Liaoning Institute of Science and Technology, Benxi, 117004, China

Received:2019-08-27 Revised:2019-10-23 Online:2020-06-10 Published:2020-06-17
Contact: Guoxing Qiu

摘要/Abstract

Abstract:

The thermal stability and mechanical properties of China low activation martensitic steel with Zr and Y were investigated via thermal aging at 550 °C for 8000 h. The Laves phase content monotonically increased with thermal aging, and the volume fraction of the Laves phases stabilized in the alloy after 3000 h of thermal aging. The observed degradation in mechanical properties was because of the coarsening of M₂₃C₆ carbides and matrix grains during the earlier stages of thermal aging. The precipitation of Laves phases and V₃Zr₃C particles increased the strength and hardness of the alloy. Grain coarsening was the primary reason for the decrease in impact properties, and the ductile-to-brittle transition temperature increased from -71 to -48 °C after 8000 h of thermal aging.

Key words: Thermal stability, Zr-containing RAFM, Precipitation, Microstructures, Mechanical properties

. [J]. 金属学报英文版, 2020, 33(6): 881-891.

Dongping Zhan, Guoxing Qiu, Changsheng Li, Yongkun Yang, Zhouhua Jiang, Huishu Zhang. Evolution of Microstructures and Mechanical Properties of Zr-Containing Y-CLAM During Thermal Aging[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(6): 881-891.

图/表 15

Table 1 Chemical composition of the steel (wt.%)

Fig.1 Microstructure images of the as-received and aged samples: a as-received, b 1000 h, c 1500 h, d 3000 h, e 5000 h, and f 8000 h

Fig.2 Grain size evolution

Fig.3 TEM images of the as-received and aged samples: a as-received, b 1500 h, c 5000 h, and d 8000 h

Fig.4 Misorientation angle distributions in the samples

Fig.5 BSE images of the as-received and aged steels: a as-received, b 1000 h, c 1500 h, d 3000 h, e 5000 h, and f 8000 h

Fig.6 Physical properties of the Laves phase precipitates in the alloy: a mean spatial diameter, b number of particles per unit volume, and c volume fraction

Fig.7 Evaluation of the time exponent (n) based on the physical properties of the Laves phase precipitates

Fig.8 TEM micrographs (a, b) and EDS results (c and d) of the M23C6 carbides in the as-received alloy (a, c) and sample that was thermally aged for 8000 h (b, d)

Fig.9 Orowan yield stresses of the M23C6 carbides (black) and the Laves phase precipitates (red) with thermal aging time

Fig.10 TEM micrographs (a, b) and EDS results (c, d) of the samples that were thermally aged for 1500 h (a, b) and 8000 h (c, d)

Fig.11 TEM images (a-d) and EDS results (e, f) of the MX carbides in the as-received and thermally aged samples: as-received (a, e), 3000 h (b), 5000 h (c, f), and 8000 h (d)

Fig.12 Effect of thermal aging on alloy hardness

Fig.13 Effect of thermal aging on alloy strength

Fig.14 Impact curves of the as-received and thermally aged samples

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Evolution of Microstructures and Mechanical Properties of Zr-Containing Y-CLAM During Thermal Aging

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