Strong strain‑hardening capability in plain carbon steel through cold rolling and heat treatment of lamellar structure

• Autorzy: Talebi Fatemeh , Jamaati Roohollah , Hosseinipour Seyed Jamal

Identyfikatory

DOI

10.1007/s43452-023-00848-8

• Języki publikacji: EN

Abstrakty

EN

In the current research, strong strain-hardening capability in 1045 carbon steel was achieved by cold rolling and heat treatment of the lamellar structure. After 60% cold rolling, the proeutectoid ferrite and pearlite were severely elongated along the rolling direction. Cementite layers with brittle nature were fragmented under the action of stress and also by shear band formation during rolling. The lamellar heterogeneous microstructure of the heat-treated samples was formed by the proeutectoid ferrite as the soft domain and the pearlite as the hard domain. Increasing the heat treatment duration promoted the spheroidization transformation of cementite, and the spheroidization degree of cementite increased. With the increase in the time of heat treatment, the number of recrystallized grains is increased. Heat treatment led to weakening the deformation texture (⟨100⟩‖ND or θ fiber) and strengthening the recrystallization texture (⟨110⟩‖ND or ζ fiber). The heat-treated steels revealed an average microhardness value much higher than its macrohardness due to changes in the texture of ferrite grains. Heat treatment decreased the strength and hardness, and increased the ductility and toughness of steel compared to the cold-rolled sample owing to the annihilation of dislocations and the strengthening transition from strain hardening to grain refinement. The heat-treated samples exhibited a wider range of uniform plastic deformation and a larger strain hardening rate than the cold-rolled sample owing to the occurrence of the recovery of strain hardening rate phenomenon. The appropriate collocation of the fine spherical cementite and the soft/hard domains (with a large difference in mechanical properties) was beneficial to obtaining excellent strength-ductility balance in plain medium carbon steel. After heat treatment, the extent of ductile fracture considerably increased. With increasing the time of heat treatment from 1 to 3 h, the number of lamellar dimples decreased owing to the creation of more fine spherical cementite

Słowa kluczowe

EN

1045 carbon steel; cold rolling; heat treatment; microstructure; mechanical properties

PL

stal węglowa; walcowanie na zimno; obróbka cieplna; mikrostruktura; właściwości mechaniczne

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2024
• Tom: Vol. 24, no. 1
• Strony: art. no. e44, 2024
• Opis fizyczny: Bibliogr. 18 poz., rys., tab., wykr.

Twórcy

autor

Talebi Fatemeh

• Department of Materials Engineering, Babol Noshirvani University of Technology, Shariati Ave., Babol 47148-71167, Iran

autor

Jamaati Roohollah

• Department of Materials Engineering, Babol Noshirvani University of Technology, Shariati Ave., Babol 47148-71167, Iran

• https://orcid.org/0000-0002-4764-9910

autor

Hosseinipour Seyed Jamal

• Department of Materials Engineering, Babol Noshirvani University of Technology, Shariati Ave., Babol 47148-71167, Iran

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025)