Martensite obtained by quenching, and in which a large amount of C is dissolved in the α iron, there are brittle and hard and. To do this the gummy nature, it is necessary to eject C. Heated to about 400 ℃ (tempering) Then, it spits the C in the form of Fe3C from hard martensite. This organization is troostite. A mixed structure of ferrite and cementite, a hardness second only to martensite. There is also a spring, but it is easy to rust shortcomings. It was discovered by Torusuto of France.
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