Effect of strain hardening of the surface on the mechanical properties of samples at low temperatures
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Conclusions
- 1.
Machining of samples for mechanical tests leads to strain hardening in surface layers and residual stresses. With cooling to negative temperatures and deformation, such samples of austenitic steels form an elevated amount of martensite in the strain hardened zone, which leads to reduction of the plastic characteristics.
- 2.
The reduction of the plasticity depends on the depth of cutting in the last pass and the testing temperature, and is evident with a cutting depth of 0.3 mm or more only at the temperature of liquid hydrogen.
- 3.
To prevent reduction of the plastic characteristics it is recommended that samples be machined with a cutting depth of less than 0.3 mm in the final pass, or (with a larger cutting depth) that the samples be tempered.
Keywords
Hydrogen Mechanical Property Surface Layer Martensite Residual StressPreview
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Literature cited
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