Ar4

Ar4

(metallurgy)
The temperature at which delta ferrite is converted to gamma iron (austenite) upon cooling a steel.
References in periodicals archive ?
IPCC AR4 (2007): "Global average sea-level rose at an average rate of 1.
In 2015, Toyota exhibited Camatte Hajime along with Camatte Vision, which employed AR4 in order to enable children to enjoy a simulated experience of driving through town in a car specified to their liking.
Baseline and Alternative Refrigerant Data ASHRAE GWP, (a) GWP, (a) Refrigerant Safety AR4 AR5 Class (c) R-22 unit R-22 (Baseline) (a) A1 1810 1760 N-20B (b) A1 988 904 DR-3 (b) A2L 148 146 ARM-20B (b) A2L 251 251 L-20A (R-444B) (b) A2L 295 295 DR-93 (b) A1 1258 1153 Propane (R-290) A3 3 3 R-410A unit R-410A (Baseline) (a) A1 2088 1924 ARM-71A (b) A2L 460 461 R-32 (a) A2L 675 677 DR-55 (b) A2L 698 676 L41-2 (R-447A) (b) A2L 583 572 HPR-2A (b) A2L 600 593 (a) Sources: IPCC (Intergovernmental Panel on Climate Change) Assessment Report AR4 (IPCC 2007), IPCC AR5 (IPCC 2013) (b) GWP values for refrigerant blends not included in IPCC reports are calculated as a weighted average using manufacturer-supplied compositions.
2014) establece una equivalencia entre los escenarios AR5 y el AR4 (IPCC, 2007), el RCP 2.
The results of a set of high-resolution numerical simulations, utilizing change fields computed from a subset of five IPCC AR4 GCM projections, demonstrate that large-scale thermodynamic change can influence the track and intensity of Hurricane Sandy even within the limits imposed by a highly similar initial synoptic weather pattern.
The Intergovernmental Panel on Climate Change's AR4 assessment report, released in 2007, stated that Antarctic sea ice cover was relatively constant between 1979 and 2005.
The GWP values of other refrigerants, currently not listed in the AR4, were provided by manufacturers or compiled from publicly available information.
After the IPCC AR4 was published, progress has been made in various areas related to the sea-level rise issue.
A leaked draft of the AR5 contained claims that temperatures could reach up to six degrees higher than current levels--a big increase from the two to four degree increase forecast in AR4.
In 2007 the IPCC's AR4 stated that "in some [African] countries, yields from rain-fed agriculture could be reduced by up to 50%.
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