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Evaluation of material degradation of lcr-lmo-0.25v steel using ball indentation method

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Abstract

The BI (Ball Indentation) method has the potential to assess the mechanical properties and to replace conventional fracture tests. In this study, the effect of aging on mechanical behavior of lCr-lMo-0.25V steels procured by isothermal aging heat-treatment at four different aging times in the range of 0–1820 hours at 630h°C., were investigated using BI system.

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Abbreviations

σ t :

True stress

ε p :

True plastic strain

K :

Strength coefficient

D :

Diameter of ball indenter

d p :

Plastic indentation diameter

d t :

Total indentation diameter

E i :

Elastic modulus of indenter

E 2 :

Elastic modulus of specimen

h t :

Total depth of indentation

K ic :

Fracture toughness

K q :

Fracture toughness (not satisfying the size requirements)

Pmax :

Maximum indentation load

S :

Inclination of indentation load-depth curve

Q :

Activation energy

R :

Gas constant

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Authors and Affiliations

  1. School of Mechanical Engineering, Sungkyunkwan University, 300 Chunchun-dong, Jangan-gu, Suwon, 440-746, Kyonggi-do, Korea

    Chang-Sung Seok & Jae-Mean Koo

  2. Digital Module Division, Sound Solution Team(R & D), SamSung Electro-Mechanics Co., LTD., 314 Maetan 3-Dong, Yeongtong- Gu, Suwon, 442-743, Kyunggi-Do, Korea

    Jeong-Pyo Kim

Authors
  1. Chang-Sung Seok
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  2. Jeong-Pyo Kim
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  3. Jae-Mean Koo
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Correspondence to Chang-Sung Seok.

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Seok, CS., Kim, JP. & Koo, JM. Evaluation of material degradation of lcr-lmo-0.25v steel using ball indentation method. KSME International Journal 18, 1730–1737 (2004). https://doi.org/10.1007/BF02984321

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