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The prediction of precipitation strengthening in microalloyed steels

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Abstract

The effectiveness of interphase precipitation strengthening in microalloyed steels depends on the temperature dependence of the solubility of the precipitation phase in austenite and on the temperature utilized in soaking. Using an approximate method of calculating the solubility of microalloying elements in the presence of both carbon and nitrogen, a precipitation strengthening potential parameter was developed. On relating this parameter to the chemical compositions and thermal histories of microalloyed steels, it was determined that the interphase precipitation strengthening determined in this and other studies increases linearly with the strengthening potential parameter. On the basis of the linear dependence of precipitation strengthening on the precipitation potential and other observations, it appears that interphase precipitation strengthening is not due to the Orowan looping mechanism but rather to interactions of gliding dislocations with the strain fields of coherent precipitates.

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Abbreviations

(C):

solubility of carbon in austenite (wt pct)

C T :

total carbon content (wt pct)

d :

mean linear intercept grain diameter (mm)

f a :

volume fraction of ferrite

G :

shear modulus (MPa)

KMC :

solubility product for MC carbide in austenite

KMN :

solubility product for MN nitride in austenite

KLC :

solubility product for LC carbide in austenite

(L):

solubility of microalloying element L in austenite (wt pct)

L T :

total microalloying element L (wt pct)

LC:

weight fraction of LC carbide in the steel

(M):

solubility of microalloying element M in austenite (wt pct)

MT :

total microalloying element M (wt pct)

MC:

weight fraction of MC carbide in the steel

MN:

weight fraction of MN nitride in the steel

(N):

solubility of nitrogen in austenite (wt pct)

NT :

total nitrogen content (wt pct)

P ppt :

precipitation potential (wt pct)

S p :

true pearlite interlamellar spacing, mm

σ ys :

yield strength with no precipitation as calculated with Gladman’s equation (MPa)

Δσys :

increase in yield strength due to precipitation (MPa)

ZL :

atomic weight of microalloying element L

ZM :

atomic weight of microalloying element M

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Authors and Affiliations

  1. Research and Development, China Steel Corporation, Kaohsiung, Taiwan, Republic of China

    H. R. Lin (Associate Scientist)

  2. Department of Metallurgical Engineering, Michigan Technological University, 49931, Houghton, MI

    A. A. Hendrickson (Professor)

Authors
  1. H. R. Lin
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  2. A. A. Hendrickson
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Lin, H.R., Hendrickson, A.A. The prediction of precipitation strengthening in microalloyed steels. Metall Trans A 19, 1471–1480 (1988). https://doi.org/10.1007/BF02674021

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