Internal Structure and Hardness of Surface Oxidized FeCrNiAl Alloys

Yamada, Shǔji; Hamada, Toru; Imai, Junji; Tsuji, Eiji; Mizukoshi, Tomoyuki

doi:10.2320/jinstmet1952.56.3_247

Cited by 4 publications

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“…It has also been reported that in the matrix structure of this alloy, Ni-Al family B 2 phase particles are dispersed. [24][25][26][27][28][29] This suggests a possibility that an increased hardness due to precipitation strengthening can be obtained in Fe-Cr-Ni-Al stainless steel. Figure 1(a), as described before, shows a heat and working pattern before being subjected to the process for producing blade edges for usual martensitic blade steels.…”

Section: Introductionmentioning

confidence: 99%

Softening by Coarsening of Ni-Al B<SUB>2</SUB> Phase Particles in Fe-Cr-Ni-Al-Zr Alloy

Imai¹,

Hamada²,

Uesugi

et al. 2008

Mater. Trans.

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In Fe-Cr-Ni-Al stainless steels, surface alumina layer with good adhesion is formed by heat treatment at a high temperature in oxidizing atmosphere and can prevent burrs from being formed in grinding of cutting edges. On the other hand, as the precipitation velocity of Ni-Al B 2 phase particles dispersed in the matrix of these steels is remarkably high, it is hard to obtain a full solid-solution condition without any fine precipitates by conventional solution treatment. And, the dispersed particles increase the hardness of the material and it is impossible to decrease the hardness sufficiently to form the cutting blade only by the annealing after cold rolling. According to the process developed in this study, most of the B 2 phase particles are dissolved once, cooled slowly and, thus, combined with remaining particles to form coarse particles. As a result, precipitation of fine particles is prevented and softening necessary to form into given shapes is achieved.

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