Formation and evolution of precipitates in high Cr ferritic heat-resistant steels

Zhou, Xiaosheng; Liu, Y. C.; Liu, C. X.; Yu, Liming; Li, H. J.

doi:10.1179/1432891715z.0000000001543

Cited by 6 publications

(2 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The carbide precipitation leads to the exothermic peak in DSC curve. The M 23 C 6 carbide is rich in carbon and chromium [25]. The stability of meta-austenite will decrease after carbide precipitation due to the decrease of alloying elements [26].…”

Section: Discussionmentioning

confidence: 99%

Phase Transformation and Carbide Precipitation of Functional Gradient Semi-solid 9Cr18 Steel

Wang

Song

2018

Acta Metall. Sin. (Engl. Lett.)

View full text Add to dashboard Cite

The unique phase transformation and carbide evolution in 9Cr18 steel were investigated during semi-solid forming and subsequent heat treatment. The functional gradient thixoforging 9Cr18 component was divided into inner area and edge area. Microstructure evolution was different at each area. After semi-solid cooling, the solid particles in the inner area were retained as meta-austenite. During annealing, M 23 C 6 carbide began to precipitate when temperature reached 700°C. Martensite transformation occurred when temperature reached 800°C. The occurrence of M 23 C 6 carbide and martensite structure would be harmful to the mechanical properties of inner area. In the edge area, the liquid underwent eutectic transformation to form bar-shape M 7 C 3 carbide and secondary austenite after semi-solid cooling. The width of bar-shape carbide would decrease during annealing. By controlling the carbide evolution, we could tailor the functional gradient material with required property.

show abstract

Section: Discussionmentioning

confidence: 99%

Phase Transformation and Carbide Precipitation of Functional Gradient Semi-solid 9Cr18 Steel

Wang

Song

2018

Acta Metall. Sin. (Engl. Lett.)

View full text Add to dashboard Cite

show abstract

“…Based on this, the pinning forces of MX carbonitrides should be higher than that of M 23 C 6 carbides. Furthermore, Some references 26 , 27 also proved that MX carbonitrides in 9 wt.% Cr ferritic steel were more advantageous than M 23 C 6 carbides because MX precipitated finely and densely, and did not coarsen easily at high temperatures. Factually, MX carbonitrides effectively strengthen boundaries because they can act as obstacles to migrating boundaries 28 , and are very stable during short aging/creeping.…”

Section: Introductionmentioning

confidence: 97%

Precipitates and Particles Coarsening of 9Cr–1.7W–0.4Mo–Co Ferritic Heat-Resistant Steel after Isothermal Aging

Gao

Zhang

et al. 2017

Sci Rep

View full text Add to dashboard Cite

The precipitates obtained by EPE technology from the 9Cr-1.7W-0.4Mo-Co ferritic heat-resistant steel subject to isothermal aging were investigated using SEM, TEM and XRD. The particle size distribution and the coarsening kinetics of M23C6 with duration of isothermal aging were also analyzed with or without consideration of Laves phase. The results show that the isolated dislocations were detected in delta ferrite interior, and the precipitates on delta ferrite and martensite boundaries are obviously larger than other locations. Fe2W-Laves phase can only be found as duration of aging time to 2000 h, and is preferential to form adjacent to M23C6 particles. The small M23C6 particles firstly coarsen, but the large M23C6 are relatively stable during short aging. The total coarsening rate of M23C6 precipitates is 9.75 × 10−28m3s−1, and the coarsening of M23C6 depends on the formation of Laves phase.

show abstract

Effects of Isothermal Aging on Microstructure and Mechanical Property of Low-Carbon RAFM Steel

Chen

Liu

Chen

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

View full text Add to dashboard Cite

Formation and evolution of precipitates in high Cr ferritic heat-resistant steels

Cited by 6 publications

References 46 publications

Phase Transformation and Carbide Precipitation of Functional Gradient Semi-solid 9Cr18 Steel

Phase Transformation and Carbide Precipitation of Functional Gradient Semi-solid 9Cr18 Steel

Precipitates and Particles Coarsening of 9Cr–1.7W–0.4Mo–Co Ferritic Heat-Resistant Steel after Isothermal Aging

Effects of Isothermal Aging on Microstructure and Mechanical Property of Low-Carbon RAFM Steel

Contact Info

Product

Resources

About