Thermodynamic control of pearlite lamellar sheet spacing and its effect on mechanical properties of steel

Mo Wenfeng

doi:10.7513/j.issn.1004-7638.2021.05.027

Volume 42 Issue 5

Oct. 2021

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Mo Wenfeng. Thermodynamic control of pearlite lamellar sheet spacing and its effect on mechanical properties of steel[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(5): 175-179. doi: 10.7513/j.issn.1004-7638.2021.05.027

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Mo Wenfeng. Thermodynamic control of pearlite lamellar sheet spacing and its effect on mechanical properties of steel[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(5): 175-179. doi: 10.7513/j.issn.1004-7638.2021.05.027

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Thermodynamic control of pearlite lamellar sheet spacing and its effect on mechanical properties of steel

doi: 10.7513/j.issn.1004-7638.2021.05.027

Mo Wenfeng

School of Mechanical and Electrical Engineering, Liuzhou Vocational and Technical College, Liuzhou 545616, Guangxi, China

Received Date: 2020-07-22
Publish Date: 2021-10-30

Abstract

Abstract

A pearlite steel was prepared via laboratory steelmaking, and then after rolling and heat treatment to obtain two different samples with different pearlite lamellar spacing. The mechanical properties and microstructures of the materials were observed by scanning electron microscopy and universal testing machine. Results show that the reciprocal S_p⁻¹(μm⁻¹) of pearlite lamellae and transformation super cooling degree of pearlite ∆T(℃) satisfy the linear relationship of S_p⁻¹=9.0201+0.03358∆T. This indicates that the theoretical minimum pearlite lamellae spacing(~61 nm) can be obtained by isothermal treatment at 550 ℃. With the thinning of the spacing between the very fine pearlite lamellar( from 105 to 72 nm), the strength increases but ductility will deteriorate significantly, and the ultimate deformation strain will decrease from 0.18 to 0.12. This result conflicts with the traditional grain refinement strengthening theory. The reason is that the refined pearlite lamellar restrains the free movement of dislocations.
- high strength steel,
- pearlite,
- lamellar spacing,
- strength,
- ductility,
- EBSD

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References(13)

References

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