Cold-worked microalloyed steels do not require as much cold working to achieve the same strength as other carbon steel; this also leads to greater ductility. Hot-worked microalloyed steels can be used from the air-cooled state. If controlled cooling is used, the material can produce mechanical properties similar to Q&T steels. Machinability is better than Q&T steels because of their more uniform hardness and their ferrite-pearlite microstructure.[4]
Because microalloyed steels are not quenched and tempered, they are not susceptible to quench cracking, nor do they need to be straightened or stress relieved. However, because of this, they are through-hardened and do not have a softer and tougher core like quench and tempered steels.[4]
Degarmo, E. Paul; Black, J T.; Kohser, Ronald A. (2003), Materials and Processes in Manufacturing (9th ed.), Wiley, ISBN0-471-65653-4.
January 01, 1970
microalloyed, steel, type, alloy, steel, that, contains, small, amounts, alloying, elements, including, niobium, vanadium, titanium, molybdenum, zirconium, boron, rare, earth, metals, they, used, refine, grain, microstructure, facilitate, precipitation, harden. Microalloyed steel is a type of alloy steel that contains small amounts of alloying elements 0 05 to 0 15 including niobium vanadium titanium molybdenum zirconium boron and rare earth metals They are used to refine the grain microstructure or facilitate precipitation hardening 1 In terms of performance and cost microalloyed steels are between a carbon steel and a low alloy steel Their yield strength is between 275 and 750 MPa 40 and 110 ksi without heat treatment 2 Weldability is good and can even be improved by reducing carbon content while maintaining strength Fatigue life and wear resistance are superior to similar heat treated steels The disadvantages are that ductility and toughness are not as good as quenched and tempered Q amp T steels They must also be cooled enough for all of the alloys to be in solution after forming the material must be quickly cooled to 540 to 600 C 1 004 to 1 112 F 3 Cold worked microalloyed steels do not require as much cold working to achieve the same strength as other carbon steel this also leads to greater ductility Hot worked microalloyed steels can be used from the air cooled state If controlled cooling is used the material can produce mechanical properties similar to Q amp T steels Machinability is better than Q amp T steels because of their more uniform hardness and their ferrite pearlite microstructure 4 Because microalloyed steels are not quenched and tempered they are not susceptible to quench cracking nor do they need to be straightened or stress relieved However because of this they are through hardened and do not have a softer and tougher core like quench and tempered steels 4 References editNotes edit Degarmo p 116 Davis Joseph R 2001 High Strength Low Alloy Steels Alloying Understanding the Basics ASM International p 193 ISBN 9781615030637 Degarmo pp 116 117 a b Degarmo p 117 Bibliography edit Degarmo E Paul Black J T Kohser Ronald A 2003 Materials and Processes in Manufacturing 9th ed Wiley ISBN 0 471 65653 4 Retrieved from https en wikipedia org w index php title Microalloyed steel amp oldid 1180979319, wikipedia, wiki, book, books, library,
