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SUMMARY:Characterization of nanoscale precipitates in a new 2GPa strength 
 steel using small angle x-ray scattering
DTSTART;VALUE=DATE-TIME:20141120T000000Z
DTEND;VALUE=DATE-TIME:20141120T003000Z
DTSTAMP;VALUE=DATE-TIME:20260711T053402Z
UID:indico-contribution-639@events01.synchrotron.org.au
DESCRIPTION:Speakers: Christopher Hutchinson (Monash University)\nSteels a
 re used extensively in the manufacture of automobiles. They may not sound 
 like advanced materials to those not involved in their development – aft
 er all they have been available for centuries. However\, if we consider a 
 typical modern automobile\, none of the steels found in the structure exis
 ted 10 years ago. These are engineering alloys that are being intensively 
 developed and improved\, and more so than any other alloy class.\nThis pre
 sentation discusses a new class of steel with strengths approaching 2GPa t
 hat was developed for applications in the automotive industry. The alloy d
 esign process included the coupling of computational thermodynamics with a
  Genetic Algorithm for compositional optimization. The dominant contributi
 on to these high strengths is a nanoscale distribution of particles within
  the material and a quantitative understanding of their size\, shape and v
 olume fraction is a key requirement for rationalizing the observed propert
 ies.\nThe particle distribution was characterized at the Australian Synchr
 otron using small angle x-ray scattering (SAXS) in both ex-situ samples an
 d during in-situ thermal treatments to monitor the earliest stages of part
 icle nucleation and growth. Combined with 3D measurements of particle comp
 ositions using atom probe tomography (APT)\, it was possible to extract bu
 lk quantitative measures of the particle volume fractions and hence calcul
 ate representative number densities of particles. These nanoscale particle
 s have number densities comparable to the highest densities so far observe
 d in engineering alloys. The information gained from these SAXS and APT ex
 periments helps to verify and improve the computational alloy design proce
 ss.\n\nhttps://events01.synchrotron.org.au/event/3/contributions/639/
LOCATION: Conference Room AS
URL:https://events01.synchrotron.org.au/event/3/contributions/639/
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