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The study aims to understand how different quenching temperatures affect the microstructure and hydrogen-assisted cracking resistance of Q+T bolt steel.

July 15, 2026MetalsOpen Access

The Influence of Quenching Temperature on the Microstructure and Hydrogen-Assisted Cracking Resistance of Quenched and Tempered (Q+T) Bolt Steel

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The study aims to understand how different quenching temperatures affect the microstructure and hydrogen-assisted cracking resistance of Q+T bolt steel.
Investigated bolt steel subjected to Q+T heat treatment with various quenching temperatures (850-1050 °C) followed by tempering at 500 °C.
Conducted microstructural characterization, hydrogen permeation tests, and slow strain rate tensile tests.
Analyzed changes in grain structure, hydrogen diffusion properties, and resistance to hydrogen-assisted cracking.
Effective hydrogen diffusion coefficient increased with quenching temperature due to grain coarsening, weakening hydrogen trapping by grain boundaries.
Strength loss ratio increased from 7.3% to 12.0% and plasticity loss ratio from 10.0% to 13.6% with higher quenching temperatures, indicating increased susceptibility to cracking.
Fracture morphology changed from deep dimples to flat dimples, indicating reduced resistance to hydrogen-assisted cracking.

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Implication

Randomized trial investigates microstructural changes and cracking resistance in quenched and tempered bolt steel, suggesting optimal heat treatment conditions.

Cite This Study

Wen et al. (2026) studied this question.

synapsesocial.com/papers/6a5723c288b21df875480664 https://doi.org/10.3390/met16070786

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Implication

Randomized trial investigates microstructural changes and cracking resistance in quenched and tempered bolt steel, suggesting optimal heat treatment conditions.

The Influence of Quenching Temperature on the Microstructure and Hydrogen-Assisted Cracking Resistance of Quenched and Tempered (Q+T) Bolt Steel

Key Points

Discussion

Implication

Cite This Study

The Influence of Quenching Temperature on the Microstructure and Hydrogen-Assisted Cracking Resistance of Quenched and Tempered (Q+T) Bolt Steel

Key Points

Discussion

Implication

Cite This Study

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