Residual Ferrite Control of 9Cr ODS Steels by Tailoring Reverse Austenite Transformation

doi:10.1007/s40195-020-01171-4

金属学报英文版 ›› 2021, Vol. 34 ›› Issue (2): 187-195.DOI: 10.1007/s40195-020-01171-4

收稿日期:2020-07-30 修回日期:2020-09-16 接受日期:2020-09-27 出版日期:2021-02-10 发布日期:2021-02-09

Residual Ferrite Control of 9Cr ODS Steels by Tailoring Reverse Austenite Transformation

Xiaosheng Zhou¹, Hao Chen¹, Chenxi Liu², Yongchang Liu²()

¹Key Laboratory for Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
²State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science and Engineering, Tianjin University, Tianjin, 300354, China

Received:2020-07-30 Revised:2020-09-16 Accepted:2020-09-27 Online:2021-02-10 Published:2021-02-09
Contact: Yongchang Liu

摘要/Abstract

Abstract:

By tailoring the reverse austenite transformation behavior of 9Cr oxide dispersion strengthened (ODS) ferritic/martensitic steels, the residual ferrite in ODS steels can be controlled. The reverse austenite transformation behavior of ODS steels is closely related to the initial microstructure conditions prior to austenite transformation. For the spark plasma sintered steels, both the amount and size of residual ferrite decrease with increasing heating rate. Nevertheless, high heating rate will increase the amount and size of residual ferrite in annealed ODS steels. As an isothermal treatment is performed at temperatures above Ac₁, lower isothermal temperature has a more evident effect on the ferrite distribution in spark plasma sintered steels than that in annealed ones.

Key words: Oxide dispersion strengthened steels, Residual ferrite, Austenite transformation

. [J]. 金属学报英文版, 2021, 34(2): 187-195.

Xiaosheng Zhou, Hao Chen, Chenxi Liu, Yongchang Liu. Residual Ferrite Control of 9Cr ODS Steels by Tailoring Reverse Austenite Transformation[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(2): 187-195.

图/表 11

Fig. 1 Sketch map showing the heat treatments of 9Cr ODS steels

Fig. 2 DSC curves of as-sintered 9Cr-ODS steels under various heating rates

Fig. 3 OM micrographs of as-sintered 9Cr-ODS steels under different heating rates: a 10 °C/min, b 20 °C/min, c 30 °C/min, d 40 °C/min

Fig. 4 Volume fraction and grain size of ferrite in as-sintered 9Cr-ODS steels subjected to various heating rates

Fig. 5 a Martensite/ferrite interphase boundary in 9Cr-ODS steel under heating rate of 10 °C /min, the oxide distribution in b martensite, c ferrite

Fig. 6 Under different heating rates, DSC curves of as-annealed 9Cr-ODS steels in heating

Fig. 7 OM micrographs of as-annealed 9Cr-ODS steels under different heating rates: a 10 °C/min, b 20 °C/min, c 30 °C/min, d 40 °C/min

Fig. 8 Volume fraction and size of ferrite in as-annealed 9Cr-ODS steels subjected to various heating rates

Fig. 9 TEM images showing microstructure of as-annealed 9Cr-ODS steels subjected to heating rates of a, b 10 °C/min, c, d 40 °C/min

Fig. 10 OM and SEM micrographs of as-sintered 9Cr-ODS steels subjected to isothermal treatment at a, c 870 °C, b, d 1000 °C

Fig. 11 OM and SEM micrographs of as-annealed 9Cr-ODS steels subjected to isothermal treatment at a, c 870 °C, b, d 1000 °C

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Residual Ferrite Control of 9Cr ODS Steels by Tailoring Reverse Austenite Transformation

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