期刊
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
卷 14, 期 1, 页码 -出版社
TAYLOR & FRANCIS LTD
DOI: 10.1088/1468-6996/14/1/014208
关键词
lath martensitic steels; cleavage; microstructure; fracture
资金
- National Science Foundation [DMR1006160]
In this paper we discuss the microstructure of lath martensitic steels and the mechanisms by which it controls cleavage fracture. The specific experimental example is a 9Ni (9 wt% Ni) steel annealed to have a large prior austenite grain size, then examined and tested in the as-quenched condition to produce a relatively coarse lath martensite. The microstructure is shown to approximate the recently identified ` classic' lath martensite structure: prior austenite grains are divided into packets, packets are subdivided into blocks, and blocks contain interleaved laths whose variants are the two Kurjumov-Sachs relations that share the same Bain axis of the transformation. When the steel is fractured in brittle cleavage, the laths in the block share {100} cleavage planes and cleave as a unit. However, cleavage cracks deflect or blunt at the boundaries between blocks with different Bain axes. It follows that, as predicted, the block size governs the effective grain size for cleavage.
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