MATEC Web of Conferences
Volume 33, 2015ESOMAT 2015 – 10th European Symposium on Martensitic Transformations
|Number of page(s)||6|
|Section||Martensite in steel|
|Published online||07 December 2015|
A novel approach to study the effect of heating temperature on prior-austenite microstructure of a Japanese sword
1 Center for the Promotion of Research Project, Shimane University, Shimane 690–8504, Japan
2 Department of Materials Science, Shimane University, Shimane 690–8504, Japan
3 Department of Material Analysis, Shimane University, Shimane 690–8504, Japan
a Corresponding author: email@example.com
There is uncertainty about heating temperature of final heat treatment and its effect on microstructure of Japanese sword, since the temperature is controlled entirely by experiences and skills of the swordsmith. This study proposed a novel approach to clarify how heating temperature affects prior-austenite microstructure of a Japanese sword. A fragment of the sword was normalized at 800°C to recover its initial microstructure. Specimens were cut and quenched, after being reheated at temperatures from 740 to 860°C with increment step of 20°C. Their prior-austenite microstructure was reconstructed from martensite by using our newly developed automatic reconstruction method. In normalized microstructure of the sword, coarse pearlite islands of 0.70–0.76 mass% C steel were found within a fine ferrite-pearlite matrix of 0.52–0.56 mass% C steel. The prior-austenite grains of the medium C matrix remained fine (11.6 - 15.1 μm) over the temperature range, while abnormal coarse grains (73.9 - 123.7 μm) developed from high C islands in the specimens reheated above 780°C. The prior-austenite microstructure of the original sword was closely similar to that of the specimen reheated at 760°C. It was able to estimate the heating temperature of the original sword to be approximately 760 ± 10°C.
© Owned by the authors, published by EDP Sciences, 2015
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.