Reply to the Discussion on “Prevention of High-Temperature Surface Degradation in SiMo Cast Irons by Cr and Al Alloying”


First, we thank Dr. Delin Li for paying attention to our work and providing information about the thermo-cycling behavior of SiMo ductile irons. This is interesting information; however, thermal cycling behavior was not a main topic of the article. We have read his Discussion and comments regarding the article[1] entitled “Prevention of High-Temperature Surface Degradation in SiMo Cast Irons by Cr and Al Alloying.” Dr. Li stated in Reference 2 that the results provided in Reference 1 “can be misleading when determining the temperature capability relying only on the static (unconstrained) oxidation testing, and assigning the oxidation resistance ratings to the various alloys” and “Many technical considerations, such as microstructure, stability, oxidation, mechanical, thermal cycling, and manufacturability, must be evaluated in order to achieve a high level of desired properties.” On behalf of the authors of this work and their team, we wish to respond and provide some explanations. The conclusions in the article[1] were made based on the original experimental data of static oxidation of the base SiMo and that alloyed by Cr and Al ductile irons at different temperatures in air and water vapor containing combustion atmospheres. With all due respect, we disagree that our conclusions about the critical temperatures, when surface degradation started, are misleading in regard to high-temperature material applicability. The possible effects of surface degradation on the lifetime of components were not discussed in Dr. Li’s Discussion, and simply ignoring this phenomenon does not help in the understanding of material behavior.


Materials Science and Engineering

International Standard Serial Number (ISSN)

1073-5615; 1543-1916

Document Type

Article - Journal

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Publication Date

01 Jun 2021