Enhanced resistance to fatigue crack propagation in metastable austenitic stainless steel by nanotwin bundles
نویسندگان
چکیده
Microstructure-sensitive fatigue crack growth in 304 metastable austenitic stainless steel containing nanotwin bundles was studied using a miniature compact tension specimen combined with post-fatigue metallographic examinations. The single-variant nanotwinned specimens exhibited high resistance compared to the coarse-grained without bundles, regardless of lamellar orientation. In martensite variants are formed habit plane parallel twin during propagation. Even when propagates along boundary, it tends proceed by activation multiple slip systems into phase, which inhibits brittle boundary separation. Post-fatigue transmission electron microscopy revealed that detwinning occurred ahead tip. Therefore, introducing changes course damage accumulation through and formation, enhancing resistance.
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ژورنال
عنوان ژورنال: Scripta Materialia
سال: 2021
ISSN: ['1359-6462', '1872-8456']
DOI: https://doi.org/10.1016/j.scriptamat.2021.113976