Development of the Hardness-gradient Blade Material by Aluminium Cladding.

Imai, Junji; Hamada, Toru; Yamada, Shǔji; Takegawa, Yoshinobu; Yamada, Hiroshi

doi:10.2320/materia.37.531

Cited by 3 publications

(2 citation statements)

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“…Rather the hardness of this steel increased by holding in the range of 723-823 K and over 1173 K. The hardening caused by holding this steel in the range over 1173 K is due to the precipitation of the fine Ni-Al B 2 phase particles during the air-cooling. [32][33][34][35] And the hardening caused by holding this steel in the range of 723-823 K is due to the formation of -phase as observed often in Fe-Cr family steels, which is the origin of -brittleness. 36) In the softening heat treatment in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…In order to solve the problem, by forming a hard layer with good adhesion on the surface different from the surface to be ground, the grinding burrs due to plastic deformation are cut off, resulting in good cutting edges. [7][8][9][10][11][12] One of the means to achieve this is to add Al to Fe-Cr type stainless steel and to heat in an oxidizing atmosphere such as in the air to form a stable alumina layer on the surface. [13][14][15][16][17][18][19][20][21] The surface alumina layer has a remarkable effect to control the formation of burrs at the blade edges.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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.

Self Cite

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High-Hardening Processing by Equal-Cannel Angular Extrusion in Fe-13.5Cr-1.3Mo-0.4C Stainless Steel

順二¹,

糾²,

徳照³

et al. 2008

J. Soc. Mat. Sci., Japan

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Optimizing on Hardening Behavior in Rapidly Solidified Processed Fe-13.5Cr-1.3Mo-0.4C Stainless Steel

順二¹,

糾²,

徳照³

et al. 2008

J. Soc. Mat. Sci., Japan

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An effect of the solidification rate on the hardness was investigated in Fe-Cr-Mo-C stainless steel (SUS420J2) produced by rapidly quenched casting process with single-roll at various rolling speeds from 5 to 40m/s. Furthermore the optimizing process to improve hardness after final heat treatment in industrial scale was carried out for the ingot operated with a rolling speed of 10m/s which could exhibit sound state without any materials defaults. A final goal of the higher hardness more than Hv = 800 after final heat treatment could be obtained along the process condition with the tempering (baking) treatment (air cooling after heating at 973K for 120m/s) and the quenching treatment (air cooling after heating at 1323K for 60m/s). The microstructure observation clarified that the origin of the obtained higher hardness in the optimum processed material compared with the as-cast material resulted from the finer grain size of the old austenite phase at 10μm then 20μm of the as-cast one.

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Development of the Hardness-gradient Blade Material by Aluminium Cladding.

Cited by 3 publications

References 0 publications

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

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

High-Hardening Processing by Equal-Cannel Angular Extrusion in Fe-13.5Cr-1.3Mo-0.4C Stainless Steel

Optimizing on Hardening Behavior in Rapidly Solidified Processed Fe-13.5Cr-1.3Mo-0.4C Stainless Steel

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