Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Thermomechanical_processing> ?p ?o }
Showing triples 1 to 46 of
46
with 100 triples per page.
- Thermomechanical_processing abstract "Thermomechanical processing, also known as thermo-mechanical treatment (TMT), is a metallurgical process that integrates work hardening and heat-treatment into a single process. A description of its application in rebar steel follows.The quenching process produces a high strength bar from inexpensive low carbon steel. The process quenches the surface layer of the bar, which pressurizes and deforms the crystal structure of intermediate layers, and simultaneously begins to temper the quenched layers using the heat from the bar's core.Steel billets 130mm² ("pencil ingots") are heated to approximately 1200°C to 1250°C in a reheat furnace. Then, they are progressively rolled to reduce the billets to the final size and shape of reinforcing bar. After the last rolling stand, the billet moves through a quench box. The quenching converts the billet's surface layer to martensite, and causes it to shrink. The shrinkage pressurizes the core, helping to form the correct crystal structures. The core remains hot, and austenitic. A microprocessor controls the water flow to the quench box, to manage the temperature difference through the cross-section of the bars. The correct temperature difference assures that all processes occur, and bars have the necessary mechanical properties.The bar leaves the quench box with a temperature gradient through its cross section. As the bar cools, heat flows from the bar's centre to its surface so that the bar's heat and pressure correctly tempers an intermediate ring of martensite and bainite.Finally, the slow cooling after quenching automatically tempers the austenitic core to ferrite and pearlite on the cooling bed.These bars therefore exhibit a variation in microstructure in their cross section, having strong, tough, tempered martensite in the surface layer of the bar, an intermediate layer of martensite and bainite, and a refined, tough and ductile ferrite and pearlite core.When the cut ends of TMT bars are etched in Nital (a mixture of nitric acid and methanol), three distinct rings appear: 1. A tempered outer ring of martensite, 2. A semi-tempered middle ring of martensite and bainite, and 3. a mild circular core of bainite, ferrite and pearlite. This is the desired micro structure for quality construction rebar.In contrast, lower grades of rebar are twisted when cold, work hardening them to increase their strength. However, after thermo mechanical treatment (TMT), bars do not need more work hardening. As there is no twisting during TMT, no torsional stress occurs, and so torsional stress cannot form surface defects in TMT bars. Therefore TMT bars resist corrosion better than cold, twisted and deformed (CTD) bars.".
- Thermomechanical_processing wikiPageID "24597364".
- Thermomechanical_processing wikiPageLength "3230".
- Thermomechanical_processing wikiPageOutDegree "18".
- Thermomechanical_processing wikiPageRevisionID "675530090".
- Thermomechanical_processing wikiPageWikiLink Austenite.
- Thermomechanical_processing wikiPageWikiLink Bainite.
- Thermomechanical_processing wikiPageWikiLink Carbon_steel.
- Thermomechanical_processing wikiPageWikiLink Category:Metallurgical_processes.
- Thermomechanical_processing wikiPageWikiLink Category:Steelmaking.
- Thermomechanical_processing wikiPageWikiLink Ferrite_(iron).
- Thermomechanical_processing wikiPageWikiLink Heat-treatment.
- Thermomechanical_processing wikiPageWikiLink Heat_treating.
- Thermomechanical_processing wikiPageWikiLink Martensite.
- Thermomechanical_processing wikiPageWikiLink Metallurgical.
- Thermomechanical_processing wikiPageWikiLink Metallurgy.
- Thermomechanical_processing wikiPageWikiLink Methanol.
- Thermomechanical_processing wikiPageWikiLink Nital.
- Thermomechanical_processing wikiPageWikiLink Nitric_acid.
- Thermomechanical_processing wikiPageWikiLink Pearlite.
- Thermomechanical_processing wikiPageWikiLink Quench.
- Thermomechanical_processing wikiPageWikiLink Quenching.
- Thermomechanical_processing wikiPageWikiLink Rebar.
- Thermomechanical_processing wikiPageWikiLink Surface_layer.
- Thermomechanical_processing wikiPageWikiLink Temperature_gradient.
- Thermomechanical_processing wikiPageWikiLink Work_hardening.
- Thermomechanical_processing wikiPageWikiLinkText "TMT".
- Thermomechanical_processing wikiPageWikiLinkText "Thermomechanical processing".
- Thermomechanical_processing wikiPageWikiLinkText "thermomechanical processing".
- Thermomechanical_processing hasPhotoCollection Thermomechanical_processing.
- Thermomechanical_processing wikiPageUsesTemplate Template:Reflist.
- Thermomechanical_processing subject Category:Metallurgical_processes.
- Thermomechanical_processing subject Category:Steelmaking.
- Thermomechanical_processing hypernym Process.
- Thermomechanical_processing type Election.
- Thermomechanical_processing type Process.
- Thermomechanical_processing comment "Thermomechanical processing, also known as thermo-mechanical treatment (TMT), is a metallurgical process that integrates work hardening and heat-treatment into a single process. A description of its application in rebar steel follows.The quenching process produces a high strength bar from inexpensive low carbon steel.".
- Thermomechanical_processing label "Thermomechanical processing".
- Thermomechanical_processing sameAs Traitement_thermomécanique.
- Thermomechanical_processing sameAs ടി_എം_ടി_സ്റ്റീൽ.
- Thermomechanical_processing sameAs m.080jrn1.
- Thermomechanical_processing sameAs Термомеханічне_оброблення.
- Thermomechanical_processing sameAs Q7783193.
- Thermomechanical_processing sameAs Q7783193.
- Thermomechanical_processing wasDerivedFrom Thermomechanical_processing?oldid=675530090.
- Thermomechanical_processing isPrimaryTopicOf Thermomechanical_processing.