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オーステナイトステンレス鋼薄板の引張性質におよぼす試験片形状の影響

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.5 (1973) No.3

オーステナイトステンレス鋼薄板の引張性質におよぼす試験片形状の影響

Effects of Shape and Size of Specimen on Tensile Properties of Metastable Austenitic Stainless Steel Sheets

野 原 清 彦(Kiyohiko Nohara) 渡 辺 健 次 (Kenji Watanabe) 大 橋 延 夫 (Nobuo Ohashi) 要旨 : 供試材として SUS-301 と SUS-304 を用い,引張性質におよぼす試験片形状の影響を検討 した。平行部幅の増加につれて伸びが増加した。これは軟鋼と相反する結果で,オーステ ナイトステンレス鋼では幅拘束の影響は小さく,つかみ拘束が支配的であることを示す。 また本鋼種では強度特性が形状の影響を受けるが,これは軟鋼やフェライトステンレス鋼 ではみられない特徴である。つかみ拘束の小さい形状を持つ試験片では伸び ― 荷重線図に おいてserration が多発する。したがって,ひずみの伝ぱ性が良好となり,ゆるやかなこう 配を有するひずみ分布曲線が得られる。 Synopsis :

The shape and size effects of specimens on tensile behavior were studied using metastable austenitic stainless steel sheets, JIS SUS-301 and SUS-304. Elongation increases with the parallel section width of tensile specimen quite contrary to mild steel sheets. This shows that in austenitic stainless steels the effect of the restriction at gripping section is dominant and that at parallel section width is much small. The tensile strength is influenced by the shape of specimen in the present steel sheets, although this is in no case of mild steel sheets and ferritic stainless steel sheets. Serrated regions in the load-elongation curve appeared more extensively in the specimen having a small restriction at the gripping section. In those cases, propagation of strain is large and the gradient of the strain distribution in stretched specimen is small.

(c)JFE Steel Corporation, 2003

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