EFFECT OF BAINITIC MICROSTRUCTURE ON MECHANICAL PROPERTIES OF MICROALLOYED CAST STEELS

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RASIZADEH GHANI J.; SADEGHZADEH ATTAR A.

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Journal: Year:2007 | Volume:40 | Issue:7 (101) Page(s): 942-952

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Title

EFFECT OF BAINITIC MICROSTRUCTURE ON MECHANICAL PROPERTIES OF MICROALLOYED CAST STEELS

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RASIZADEH GHANI J. | SADEGHZADEH ATTAR A. | Issue Writer Certificate

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Abstract

The effect of bainitic microstructure obtained from austempering on mechanical properties of a series of microalloyed cast steels containing Ti-V-B and V-only in comparison with base composition is investigated. The use of microalloyed wrought steels is widespread throughout the construction industry. However, the use of microalloys to increase the strength of lowcarbon content cast steels, without significant reductions in toughness or weldability, is still in its infancy.For the wrought microalloyed steels, excellent toughness and weldability are achieved by lowering the carbon content. Strength is maintained by adding small amounts of microalloying elements (usually vanadium, titanium and niobium) that precipitation strengthen the material during thermomechanical processing. Similar demands for low-cost, higher-strength steel casting with good toughness and weldability indicate a wide range of potential applications where microalloyed cast steels may be appropriate.Although these overseas experiences with these new materials have been reported, detailed information on the alloying and processing variables affecting mechanical properties is not available. The physical metallurgy principles governing the production of cast and wrought microalloyed steels are similar; however, significant differences can be expected in the final compositions, microstructure and processing.In this paper, two different alloys of microalloyed cast steels and a base composition were prepared and effect of produced microstructures by austempering on mechanical properties was evaluated. The samples were austempered at 370, 410 and 450ºC for 5, 100, 300, 600, 900, 1200 and 1500 s.Results indicated that the hardness, strength decrease and toughness, elongation increase with increasing austempering temperature respectively. Also the hardness, strength decrease and toughness, elongation increase with increasing austempering time respectively. A good combination of strength and toughness is achieved by developing a microstructure of martensite and bainite.University College of Engineering, University of Tehran 3 Examination of the microstructure by optical microscope and SEM showed that the above microstructure is achieved in the composition containing Ti-V-B by austenitizing at 900 ºC followed by holding at 410ºC for 10 min. In this case an ultimate tensile strength of 850 MPa and an elongation of 15.5% were achieved.

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APA: Copy

RASIZADEH GHANI, J., & SADEGHZADEH ATTAR, A.. (2007). EFFECT OF BAINITIC MICROSTRUCTURE ON MECHANICAL PROPERTIES OF MICROALLOYED CAST STEELS. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), 40(7 (101)), 942-952. SID. https://sid.ir/paper/382057/en

Vancouver: Copy

RASIZADEH GHANI J., SADEGHZADEH ATTAR A.. EFFECT OF BAINITIC MICROSTRUCTURE ON MECHANICAL PROPERTIES OF MICROALLOYED CAST STEELS. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN)[Internet]. 2007;40(7 (101)):942-952. Available from: https://sid.ir/paper/382057/en

IEEE: Copy

J. RASIZADEH GHANI, and A. SADEGHZADEH ATTAR, “EFFECT OF BAINITIC MICROSTRUCTURE ON MECHANICAL PROPERTIES OF MICROALLOYED CAST STEELS,” JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), vol. 40, no. 7 (101), pp. 942–952, 2007, [Online]. Available: https://sid.ir/paper/382057/en

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