Solar Cars and CO2

Tesla S has a three phase AC induction motor, 1 speed gear (9.73:1). It comes with 60 or 85 kWh lithium ion battery. 56,800 units have been sold worldwide as of Dec 2014. The EPA rates energy consumption as 237.5 Wh per km, giving a combined fuel economy of 89 miles per gallon of gasoline.

Tesla S 60 kWh
208 / 233 miles (EPA/NEDC)

Tesla S 85 kWh
265/ 310 miles (EPA/NEDC)

In their marketing they claim this as 0 CO2/mile. Since the electricity can be made by different methods that is fair, moving cars to electric power is one way to substitute renewable energy for ‘fossil fuel’.

At the moment though much of our electricity is produced by burning fossil fuels, we need to consider another number then, how much CO2 is produced in delivering a kWh of energy to our home.

That is a a bit complex, but lets say it depends on the energy mix in your country. In France it would basically be nuclear powered. 🙂

France has 76.6 % Nuclear power, 10.2% Hydro, 4.47% non-hydro renewable, 4.08% coal, 3.69% gas, 0.58% Oil.

In the UK electricital power is mainly generated from burning gas, coal and oil, with 15-20% produced from nuclear power.

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Dyanamic test austempered ductile iron

Drs Dawid Myszka, A. Wieczorek and Tadeusz Cybula from the Warsaw University of Technology, Poland investigated the influence of microstructure on the dynamic mechanical properties of austempered ductile iron using Taylor impact testing. Austempered dictile iron means it’s a cast iron, so has graphite particles in a matrix heat treated to become bainite!. Taylor impact testing means you fire cylinders of the material at an immovable object and see how the material gets squished.

Deforming Austempered Ductile Iron

Shattering Austempered Ductile Iron

The heavily deformed volume which faced the impact has resulted in hardening and in transformation to martensite — both hardness and magnetic measurements have been used. Hardening was due to mostly strain induced austenite-to-martensite transformation, and also due to cold-work.

References
D. Myszka, L. Cybula and A. Wievzorek
Influence of heat treatment conditions on microstructure and mechanical properties of austempered ductile iron after dynamic deformation test
Archives of Metallurgy and Materials
V59, Issue 3, 2014

DOI:10.2478/amm-2014-0204

A Bainite Blog Story

Recently ‘HKDHB.’ visited Japan and met with Teruhisa Okumara, a man who plays a vital role in the founding of this blog –that’s because he is the original author of another blog which was called bainite. It all started in one of the famous Cambridge tea breaks…

HKDHB happy at the success of his website was advising us that his quality content if what brings visitors to his website (seriously check out the phase transformations website if you are looking for information about metals). A the time blogs were quite a new phenomenon and the problem was how search engines were going to reduce the ‘blog noise’. Because blogs are heavily cross-linked and regularly updated there was a concern that it might be hard to find [other] quality content on the internet. Anyway Teruhisa mentioned this and said he would start a blog called “bainite” which would then become the topped ranked page when anyone searched for “bainite”. What happened next is a matter of some debate. He created the blog on a Japanese blogging site, and it did indeed become the top ranked page when searching for bainite when searching for Japanese language pages. Happy he had proved his point he then removed the page. Some people dispute this counts as being the number one in search engines…

Anyway the seed of having a bainite blog had been planted and later I created this blog to practice my writing and see if it was possible to claim the top result for the bainite search term.

Meanwhile, back to HKDBH and Teruhisa, Teruhisa made a song for bainite while he was in Cambridge, on a recent visit HKDBH asked him to sing the song again.

Bainite… it’s special… because it’s not Pearlite (or Martensite).

The First Bulk Nanostructured Metal Lecture

Prof Bhadeshia gives a lecture about how superbainite is the first ever bulk nanostructured metal at Darwin College, The lecture was given as part of Darwin College’s 50th anniversary celebrations.

Lectures on Bainite – 2007

A blast from 2007 for Harry Bhadeshia fans. These lectures can be found on youtube. Slides can be found here http://www.msm.cam.ac.uk/phase-trans/2007/M/M.html

Prof. Bhadeshia’s new book will be available soon, you can find details here: http://www.oxbowbooks.com/oxbow/other-subjects/materials-science-engineering/bainite-in-steels-3rd-edition.html