Talk:HY-80

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Wiki Education Foundation-supported course assignment[edit]

This article is or was the subject of a Wiki Education Foundation-supported course assignment. Further details are available on the course page. Student editor(s): Michael D Moore. Peer reviewers: Lwcheung.

Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 22:04, 17 January 2022 (UTC)[reply]

Weldability expansion[edit]

Greetings, I plan to add a substantial segment related to the weldability of HY80 Steel and specifics of heat transfer, residual stress and microstructure as it relates to different processes. Articles like Effects of welding processes on the mechanical properties of HY 80 steel weldments will be used as reference.— Preceding unsigned comment added by Michael D Moore (talk • contribs)

Hi Michael, thanks for that. Weldability and the cracking problems, particularly for the later steels, would be a useful addition. Andy Dingley (talk) 10:37, 23 October 2017 (UTC)[reply]

I like where this is headed. I believe that there has been some work in filler metal selection that will be important. Articles such as this could prove to be useful:Moon, D. W., R. W. Fonda, and G. Spanos. "Microhardness variations in HSLA-100 welds fabricated with new ultra-low-carbon weld consumables." Welding Journal(USA) 79.10 (2000): 278. While this may not be a part of the engineering analysis course that we are taking at OSU, it is noteworthy since weldability is affected by performance of the weld metal as well as the HAZ and weld metal chemistry, as modified by fillers, can help or hurt intended process parameter changes. Lwcheung (talk) 07:12, 30 October 2017 (UTC)[reply]

I have a small section on filler metal selection and its importance to the process in my draft edits. I also spend a good bit of time explaining the need for filler metals (autogenous welds are not viable due to formation of untempered martensite) and how the filler metals through dilution and alloying achieve the much desired acicular ferrite formation that drives excellent strength and toughness. — Preceding unsigned comment added by Michael D Moore (talk • contribs) 00:58, 13 November 2017 (UTC)[reply]

It might be outside of what you are concerned with for our project, but I think the description of fatigue in the submarine section is incorrect. Fatigue failure occurs at stress levels well below yield strength. If a material is cyclically loaded beyond yield strength, the failure mechanism is not fatigue. There's a level of stress called the endurance limit that corresponds to somewhere around one million cycles--and then some large number after that. Steel has an endurance limit, but some materials, like aluminum, have no endurance limit. Smith.11893 (talk) 00:42, 31 October 2017 (UTC)[reply]

I want to thank everyone for feedback on the suggested additions. There were will be some additional minor edits/additions going forward. Thank you all again for the feedback. — Preceding unsigned comment added by Michael D Moore (talk • contribs) 14:53, 27 November 2017 (UTC) michael moore[reply]

Fatigue strength[edit]

Someone else has pointed out problems with the description of fatigue strength; I agree that for steels, this should be addressed in terms of endurance limit, not yield strength. Of course the work is not so much in the re-write, but reconciling sources to reflect changes. I've re-phrased things to some extent, but the sources are as yet unaltered. Aboctok (talk) 19:47, 14 June 2020 (UTC)[reply]