|
Abstract:
The low cycle fatigue test of austenitic stainless steel 1Cr18Ni9Ti
has been conducted at room and low temperature in this paper. Cyclic
hardening mechanism and microstructure changes during strain cycling
have been studied. Cyclic hardening was observed at room and low
temperature. Ε and α′ marten site can be formed by strain cycling in the
austenitic stainless steel 1Cr18Ni9Ti at room and low temperature. The
content of ε marten site is less than 1.5% and the α′marten site is
plate-like and blocky. The mechanism of cyclic hardening of 1Cr18Ni9Ti
steel is the following. Cyclic hardening results mainly from the
formation of marten site during strain cycling. When the balance between
the hardening resulting from newly formed marten site and the softening
of marten site formed early is established, the cyclic hardening
saturation is reached.
Key words:
奥氏体不锈钢 变形 低温 马氏体转变
国家自然科学基金资助项目. Received
198907, received in revised form 199003
|