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The development of some dual-phase steel structures from different starting microstructures

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Abstract

The development of dual-phase structures with different morphologies has been studied in detail by intercritical annealing specimens of a steel containing 0.11 pct C and 1.6 pct Mn with different microstructures before annealing. The kinetics of formation of the two-phase structure at the annealing temperature and the redistribution of substitutional solute elements were measured in specimens quenched from the intercritical annealing temperature. The structure before annealing was either banded ferrite-pearlite, homogenized ferrite-pearlite, lath martensite, spheroidal cementite dispersed in ferrite, or austenite. No measurable partitioning of silicon or molybdenum, present in the steel in small concentrations, was found. However, close to equilibrium partitioning of manganese occurred on annealing specimens with either a ferrite-pearlite or a lath martensite structure, but during the separation of ferrite from austenite in step-quenched specimens there was no partitioning. Surprisingly, measurements of manganese concentrations using an electron beam of 1 nm diameter at intervals of 5 nm or less revealed the presence of narrow spikes in the concentration profile at many ferriteaustenite interfaces in specimens with a ferrite-pearlite or martensite starting structure as well as in those step-quenched from austenite. In some instances, a minimum in the concentration profile was found in ferrite, adjacent to a maximum at an interface. Thus, adsorption of manganese at ferriteaustenite interfaces produces concentrations in excess of the concentrations indicated by the equilibrium diagram. The probable diffusion processes controlling the kinetics of transformation in the different microstructures are identified.

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Authors and Affiliations

  1. MIT, on leave from The Baotou Institute of Metallic Materials, People's Republic of China

    Xue-Ling Cai (Visiting Scientist)

  2. Massachusetts Institute of Technology, 02139, Cambridge, MA

    A. J. Garratt-Reed (Research Scientist) & W. S. Owen (Professor of Physical Metallurgy)

Authors
  1. Xue-Ling Cai
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  2. A. J. Garratt-Reed
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  3. W. S. Owen
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Cai, XL., Garratt-Reed, A.J. & Owen, W.S. The development of some dual-phase steel structures from different starting microstructures. Metall Trans A 16, 543–557 (1985). https://doi.org/10.1007/BF02814228

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