#################################################### # Eliot Specht # requesting 7 days, at minimum=4 days # beamline 33BM, In situ, high-temperature phase transitions # instrument 33BM-C fourc #################################################### # top:/home/www/beamtime-requests/req00693.txt # UNICAT Member Beam Time Request #693 # created Fri Dec 03 16:49:19 CST 2004 #################################################### apsrun: 2005-01 beamline: 33BM collaboration: No contact: spechted@ornl.gov days: 7 description: Previous work indicated that the face centered cubic (fcc) austenite phase separates into two regions with small and large lattice parameters. This affected the carbon redistribution and also the subsequent transformation of austenite to body centered cubic (bcc) ferrite phase. Thermodynamic calculations suggest that this is separation of austenite into two different regions are not feasible. However, lattice stability calculations indicate that the iron atom in a fcc phase can exist in a low-magnetic moment (low-volume) and also in a high-magnetic (high-volume) state. Therefore, we would like to evaluate the tendency for this separation in Fe-base austenite. We explore Fe-M-C (where M stands for Pt, Pd, Ni, and Co) alloys to evaluate the tendency for these lattice parameter fluctuations. Other work will explore bcc/fcc transition kinetics in 9Cr steel. equipment_required: Huber 4-circle, spot welder, CCD detector. experiment: In situ, high-temperature phase transitions foreign_nationals: Suresh Babu (ORNL) hazards: Samples will be heated at temperatures up to 1400C in an enclosed chamber -- the same setup as previous experiments. instrument: 33BM-C fourc instrument_other: minimumdays: 4 name: Eliot Specht nonmembers: unacceptable_dates: Jan 31 - Feb 8 are unacceptable. We would prefer time toward the end of the run (late March or April), so we have time to prepare good samples. z34ID_details: #REMOTE_HOST: luk.uni.aps.anl.gov #REMOTE_ADDR: 164.54.216.151 #CONTENT_LENGTH: 1557 #HTTP_REFERER: http://www.uni.aps.anl.gov/unireq.htm #HTTP_USER_AGENT: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)