日本金属学会誌

J. Japan Inst. Metals, Vol. 28, No. 12 (1964),
pp. 794-799

On the Twin Faults in the Ausformed Fe-Cr-C Martensite

Imao Tamura1, Hirofumi Yoshimura2 and Masao Ibaraki3

1The Institute of Scientific & Industrial Research, Osaka University, Sakai; at the Present, Faculty of Engineering, Kyoto University, Kyoto
2Student of Graduate School, Osaka University, Sakai
3The Institute of Scientific & Industrial Research, Osaka University,Sakai

Abstract:

The effects of ausforming on the hardness and the structure on Fe-Cr-C alloys having a comparatively lower stacking fault energy were examined. The results of hardness measurements showed that the ausformed specimens were harder than the non-ausformed, but the increment of hardness decreased with the carbon content. The optical micrographs showed that the ausformed structure had a orientated texture almost in parallel to the rolling direction. The transmission electron micrographs showed the following: (1) In the non-ausformed specimen, stacking faults in the austenite and dislocations in the martensite were observed, and the shape of the martensite was plate-like, and the boundary of martensite plate was {110}α. (2) In the ausformed specimen, a dense distribution of dislocations in the austenite, and numerous dislocations and many twinned regions including many twin faults having the spacing of about 100 Å in the martensite were observed. The boundary of the ausformed martensite plates was bent and kinked.
It can be predicted that the hardening by producing many twinned regions in the ausformed martensite is one of the strengthening causes by ausforming in alloys such as the Fe-Cr-C alloys which have a comparatively lower stacking fault energy and show no twin faults in the martensite in the non-ausformed state.


(Received 1964/6/12)

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