Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5456381 | Materials Science and Engineering: A | 2017 | 12 Pages |
Abstract
The mechanical behavior of a P92-type steel was studied by tension and Charpy impact tests in the temperature range of 77-293Â K. The yield stress (YS) and uniform elongation increase concurrently with decreasing temperature because the steel exhibits work-hardening behavior. Transgranular dimpled fracturing remains the primary fracture mechanism under tension down to 193Â K. Brittle fracture takes place at lower temperatures. At 77Â K, the steel exhibits a well-defined yield plateau. Impact tests demonstrate that the ductile-brittle transition (DBT) occurs at 210Â K. At 193Â K, the energy absorption of 110Â J/cm2 at high impacts is attributed to extended areas of crack initiation and a stable crack propagation; the fast fracture load also has a high value. The steel becomes completely brittle at 77Â K, at which temperature the absorbed energy falls to 6Â J/cm2.
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Authors
Valeriy Dudko, Alexandra Fedoseeva, Rustam Kaibyshev,