Thermal Treatments and Characteristics Study On Unalloyed Structural (AISI 1140) Steel
The main emphasis of metallurgists has been to process the materials to obtain the balanced mechanical properties for the given application. One of the processing routes to alter the properties is heat treatment. Nearly 90% of the structural applications are related to the medium carbon an alloyed steels and hence are regarded as structural steels. The major requirement in the conventional steel is to improve workability, toughness, hardness and grain refinement. In this view, it is proposed to study the mechanical and tribological properties of unalloyed structural (AISI 1140) steel with different thermal (heat) treatments like annealing, normalizing, tempering and hardening and compared with as brought (cold worked) specimen. All heat treatments are carried out in atmospheric condition. Hardening treatment improves hardness of the material, a marginal decrease in hardness value with improved ductility is observed in tempering. Annealing and normalizing improve ductility of the specimen. Normalized specimen shows ultimate ductility. Hardened specimen shows highest wear resistance in the initial period of slide wear where as above 25KM of sliding distance, as brought steel dominates the hardened specimen. Both mild and severe wear regions are observed. Microstructural analysis shows the existence of pearlitic structure in normalized specimen, lath martensitic structure in hardened, pearlitic, ferritic structure in annealed specimen.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1077978Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1789
 Sarwar M, Priestner R., 1996, "Influence of ferrite-martensite microstructural morphology on tensile properties of dual-phase steel", Journal of Materials Science, Vol 31, pp 2091-2095.
 Erdogan M, Priestner R., 2002, "Effect of martensite content, its dispersion, and epitaxial ferrite content on Bauschinger behaviour of dual phase steel", Journal of Materials Science Technology, Vol 18, pp 369-376.
 Anand Prakash Modi, 2007, "Effects of microstructure and experimental parameters on high stress abrasive wear behaviour of a 0.19 wt % Carbon dual phase steel", Tribology International Journal, Vol 40, pp 490-497.
 Chang P., 1984, "Temper-aging of continuously annealed low carbon dual phase steel", Metal Transformation, Vol15A, pp 73- 86.
 Gunduz S, Demir B, Kacar R., 2008, "Effect of aging temperature and martensite by volume on strain aging behaviour of dual phase steel-, Iron making and Steel making, Vol 35, pp 63-68.
 Yan-qiu Zia, Wei-min Liu & Qun-Ji Xue, 2005, "Comparative study of the tribological properties of various modified mild steels under boundary lubrication condition", Journal of Wear, Vol 38, pp 508-514.
 Anijdan SHM, Vahdani H., 2005, "Room-temperature mechanical properties of dualphase steels deformed at high temperatures", Materials Letter, Vol 59, pp 1828-1830.
 Pradeep L Menezes, Kishore, & Satish V Kailas, 2006, "Influence of surface texture on coefficient of friction and transfer layer formation during sliding of pure Mg pin on EN 8 steel plate", Journal of Wear, Vol 261, pp 578-591.
 Suleyman gunduz & Atilla Torun, 2008, "Influence of straining and aging on the RT mechanical properties of dual phase steel", Journal of materials & DSN, Vol 29, pp 1914-1918.
 Abdalla AJ, Hein LRO, Pereira MS, Hashimoto TM., 1999, "Mechanical behaviour of strain aged dual phase steels", Materials Science Technology, Vol 15, pp 1167-70.
 Sun S, Pugh M., 2002, "Properties of thermo mechanically processed dual-phase steels containing fibrous martensite", Mater Science Engineering A, Vol 335, pp 298-308.