Boeing 787 Dreamliner Launch

The Boeing Dreamliner was launched for the first test flight yesterday.

The Boeing 787 is around the same size as 767-300. However the 787 is planned to be 20% more fuel-efficient than the 767. The efficiency comes equally from improvements in the engines, aerodynamics and reduced weight by use of composite materials, and the use of improved systems.

20% improvement in efficiency should translate into a 15% saving in operational efficiency.

Each plane can interchangeably use either the General Electric GEnx or Rolls-Royce Trent 1000, due to the design of a common interface. The Rolls-Royce engine was used for the test-flight.

Feng shui steel?

I found this nice clip on youtube, an extract from “Salmon of Doubt” read by Simon Jones, the guy who played Arthur Dent in the radio and television series of The Hitchhiker’s Guide to the Galaxy.

Atheist Douglas Adams is talking about the possible usefulness of the idea of ‘god’.

As an illustration, the organic approach to interaction design is explained, using the ‘Feng shui dragon’ as a model persona for design of living spaces.

What I’m trying to asking myself is now is “How would a dragon would make a steel?” Probably they wouldn’t be happy with metal that wasn’t gold or silver.

Steel Design

Italian company Briel have been offering a range of designer steel jewelry since 2001.

Breil list their design values as; design, instinct, innovation, essentiality, decision, seduction, steel, strength, style.

mucg83.f

Following from previous post on mucg73.f. I need to make futher notes of what has been done so far…

The mucg83 code is available from map.

I compared the output of my version of the program using “energy-2″ and “energy-revert” where energy2 is the subroutine in mucg73 written by Suresh Babu, and energy is the subroutine from the original mucg43 program.

Here are some graphs, comparing results with the different models for the same steel composition. The results of mucg83 are compared with mucg43 and mtttdata. I only validated that my values are the same as the mucg43 program.

I have started collecting TTT diagrams so the next step would be to compare
predictions against unseen data for TTT diagrams, and to build my own database of TTT diagrams so that I re-calculate the parameters in the program (so that different energy functions can be used if these are better).

Predictions of mttdata seem to ‘broadly’ agree with mucg43 so it seems that this model was also refitted using the free energy values from MTDATA.

Maria Santofimia Navarro reported the error in mucg73 that caused the disagreement shown above, the following line needs to be replaced
MAP_STEEL_ENERGY2=141D0*T10 + F
by
MAP_STEEL_ENERGY2=141D0*T10*4.187+ F

Multicomponent carbides trap Hydrogen

A new paper by Shingo Yamasaki and Harry Bhadeshia published in the Proceedings of the Royal Society (A 462 (2006) 2315-2330) shows that by controlling the lattice parameters of the carbide and the matrix via the steel composition and heat treatment it is possible to enhance hydrogen trapping. In Fe-C-Mo-V the cohency of the M4C3 with the matrix is shown to influence the ability to trap hydrogen, this effects the resistance of the steel to corrosion and reduction of mechanical properties.

Once again I was called into action to perform an interview of Harry, which you can find along with the paper. Interviewing seems to be getting easier, but I wish I’d remembered to mention Shingo’s name in the introduction. Also in future I have to find a way to track people down and do the interviews over the phone, otherwise every interview will be with myself and Harry

You can also find Shingo’s Phd thesis and presentation slides on hydrogen trapping on the phase transformations website.

This paper has been selected as the materials science and metallurgy department’s paper of the month for June 2006.