Hydrogen-Related Fracture Behavior under Constant Loading Tensile Test in As-Quenched Low-Carbon Martensitic Steel
Abstract
:1. Introduction
2. Materials and Methods
3. Results
4. Discussion
5. Conclusions
- The fracture time in the constant loading tensile test decreased as the applied stress and HD increased. When the applied stress was high (1000 MPa) and HD was large (more than 0.47 wt. ppm), the fractures occurred within 10 s. The fracture initiation site was the prior austenite grain boundaries, regardless of the applied stress. Consequently, we speculate that the fracture time in the constant loading tensile test corresponded to the requisite period to achieve the critical local hydrogen concentration at the prior austenite grain boundaries for the initiation of intergranular cracking.
- The fracture propagation process reconstructed via FRASTA revealed that when the applied stress was low (400 MPa), the intergranular fracture was initiated around the side surface of the specimen and gradually propagated into the inner part of the specimen. Quasi-cleavage fractures were initiated from existing intergranular cracks. In contrast, several intergranular fractures were initiated separately inside the specimen when the applied stress was high (1000 MPa).
- The hydrogen-related fracture surface (intergranular and quasi-cleavage) tended to decrease as the applied stress (or fracture stress) increased, indicating that the unstable final fracture occurred earlier when the applied stress was high. Moreover, a higher applied stress promoted the quasi-cleavage fracture. This could be because quasi-cleavage fracture corresponds to a strain-controlled fracture.
- The mode of hydrogen-related fracture was controlled by fracture stress and not by the global HD inside the specimen. Increasing the global HD decreased the necessary period for the accumulation of critical local hydrogen concentration at the fracture initiation site. We propose that the local state at the crack initiation site (including local hydrogen concentration) was constant under a given applied stress, even when the global HD was different.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Shibata, A.; Takeda, Y.; Kimura, Y.; Tsuji, N. Hydrogen-Related Fracture Behavior under Constant Loading Tensile Test in As-Quenched Low-Carbon Martensitic Steel. Metals 2022, 12, 440. https://doi.org/10.3390/met12030440
Shibata A, Takeda Y, Kimura Y, Tsuji N. Hydrogen-Related Fracture Behavior under Constant Loading Tensile Test in As-Quenched Low-Carbon Martensitic Steel. Metals. 2022; 12(3):440. https://doi.org/10.3390/met12030440
Chicago/Turabian StyleShibata, Akinobu, Yasunari Takeda, Yuuji Kimura, and Nobuhiro Tsuji. 2022. "Hydrogen-Related Fracture Behavior under Constant Loading Tensile Test in As-Quenched Low-Carbon Martensitic Steel" Metals 12, no. 3: 440. https://doi.org/10.3390/met12030440