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<p>This study investigates the feasibility of using dynamic indentation with the spherical indenter as a nondestructive method for evaluating the tensile strength and Brinell hardness of cast irons with various graphite morphologies—lamellar, spheroidal, and vermicular. Conversion between conventional static and dynamic hardness can be challenging for cast irons due to their variable elastic modulus, which is strongly influenced by graphite shape, significantly affecting impact behavior. To address this, a set of dynamic parameters—namely dynamic hardness, elastic modulus, and restitution coefficient—is proposed for estimating Brinell hardness in the range of 90 to 450 HB. The method also shows promise for predicting tensile strengths between 100 and 1100&#xa0;MPa for different grades of the cast iron. Measuring the elastic modulus of material will also allow differentiation of cast iron types: gray (lamellar graphite) or high-strength (spheroidal graphite). Conducted metallographic studies confirm this conclusion. The proposed approach, together with the developed testing device, provides a cost-effective and efficient tool for quality control in industrial cast iron production.</p>

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Nondestructive Testing of Hardness and Tensile Strength of Cast Iron by Impact Instrumented Indentation

  • 期刊论文

  • 发表日期：

    2026年2月10日

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  • Alexander Kren,
  • Nodirjon Tursunov,
  • Talgat Urazbaev,
  • Tairui Zhang,
  • German Lantsman

摘要

This study investigates the feasibility of using dynamic indentation with the spherical indenter as a nondestructive method for evaluating the tensile strength and Brinell hardness of cast irons with various graphite morphologies—lamellar, spheroidal, and vermicular. Conversion between conventional static and dynamic hardness can be challenging for cast irons due to their variable elastic modulus, which is strongly influenced by graphite shape, significantly affecting impact behavior. To address this, a set of dynamic parameters—namely dynamic hardness, elastic modulus, and restitution coefficient—is proposed for estimating Brinell hardness in the range of 90 to 450 HB. The method also shows promise for predicting tensile strengths between 100 and 1100 MPa for different grades of the cast iron. Measuring the elastic modulus of material will also allow differentiation of cast iron types: gray (lamellar graphite) or high-strength (spheroidal graphite). Conducted metallographic studies confirm this conclusion. The proposed approach, together with the developed testing device, provides a cost-effective and efficient tool for quality control in industrial cast iron production.