No feel free to butt in. Your input is always appreciated.
You really do bring up a good point with the Jumo-004. The problem went beyond just the blades though. The issue with this new engine was that it ran at higher rotational speeds and therefore higher temperatures than previous engine designs. The best suited materials for these high temperatures would have been made of nickle and chromium alloys depending on the application. But for the Jumo these materials were in extreme short supply. This led to some creative processes in order to get the engines manufactured. For example, to save the limited chromium for blade construction, they tried building the combustion chamber out of steel which was then anodized with aluminum and baked to make it more resistant to high temperatures (I think the baking process is the same as what they use today for aluminum blocks in cars). This was only somewhat successful and as a result the Jumo engines of May 1944 when I mentioned the 7 total Me-262s were assigned to combat would only last about 10 hours before they would fail. This is the primary reason why only 1 of the 7 aircraft was serviceable at this early stage.
Were the necessary strategic metals for the Jumos ever sourced in reasonable quantities during wartime, or was it a matter of by 1943/1944 the required metals were no longer available due to lost territory and closed sea lanes?