Comparing Stress Corrosion Cracking Behavior of Additively Manufactured and Wrought 17-4PH Stainless Steel
نویسندگان
چکیده
As a high-strength corrosion-resistant alloy, stress corrosion cracking (SCC) behavior is key consideration for the conventional, wrought form of 17-4PH stainless steel. With increasing popularity additively manufactured (AM) 17-4PH, understanding SCC AM will be similarly critical its presumed, future applications. The current study quantifies and compares both form, as baseline, at peak-aged (∼1,200 MPa) overaged (∼1,050 strength levels. laser powder bed fusion technique followed by post-process hot isostatic press (HIP), solution annealing, aging heat treatments used to produce with similar microstructures levels facilitate comparison. quantified using fracture mechanics-based rising (dK/dt = 2 MPa√m/h) constant 0 intensity tests in neutral 0.6 M NaCl various applied potentials. Limited susceptibility was observed open-circuit anodic potentials forms 17-4PH. At cathodic potentials, consistently underperforms up 5-fold faster crack growth rates 200 mV 400 wider ranges. These results are interrogated through microstructural fractographic analysis interpreted decohesion-based hydrogen-assisted model. Initial analyses show that (1) increased oxygen content, (2) porosity induced argon processing, (3) slow cooling (310°C/h) during conventional HIP processing might contribute degraded performance
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ژورنال
عنوان ژورنال: Corrosion
سال: 2022
ISSN: ['0010-9312', '1938-159X']
DOI: https://doi.org/10.5006/4064