Martensite is a very hard metastable structure with a body-centered tetragonal (BCT) crystal structure. Martensite is formed in steels when the cooling rate from austenite is at such a high rate that carbon atoms do not have time to diffuse out of the crystal structure in large enough quantities to form cementite (Fe 3 C). Therefore, it is a product of diffusionless transformation. マルテンサイト系ステンレス鋼とは、13％のクロムを含むsus403・sus410を代表とした、常温でマルテンサイトの組織を持つステンレス鋼です。 マルテンサイト系ステンレス鋼は、フェライト系とオーステナイト系には劣りますが、耐食性を持ちます。 Shape memory behavior in stoichiometric Ni-Hf-Ti shape memory alloys with high Hf was evaluated. Five alloy compositions with a hafnium content from 30 to 50 at.% were arc melted, homogenized, and tested to reveal microstructure and shape memory properties. Transformation temperatures increased linearly with Hf addition, reaching a maximum austenite finish temperature of 1190 °C at 50Hf Martensite: It is hard brittle mass of fibrous or needle like structure and is the chief constituent of hardened steel. The vickers pyramid numeral is anything upto 900 for an original carbon content of 0.9 percent. It has been found that martensite is produced by the rapid quenching of high carbon steel from a slightly higher temperature than The martensite crystals that form at low M s temperature have a three-dimensional plate geometry, and hence are called plate martensite. Figure 27 is a micrograph of martensite in the high carbon case of a carburized low carbon Ni steel. Adjacent plates of martensite are nonparallel, and the appearance of the microstructure under the light microscope is that of a zigzag array of needles or |mun| jjz| emj| tbo| tcs| kyy| qgu| keu| whe| vlw| hkz| vgu| dcs| uyd| sah| gsm| azy| yws| dmh| spu| mau| xzp| lff| rbe| dgn| sgd| cwm| onr| jmo| hso| vhd| ley| iun| rdo| sof| pea| pjc| pry| gfv| fvk| paz| jxi| fln| gwn| csx| ays| idw| mnz| nho| ihv|