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高強度焼結部品用 Cr 系合金鋼粉の高強度化機構

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川崎製鉄技報

KAWASAKI STEEL GIHO Vol. 32(2000) No.1

高強度焼結部品用 Cr 系合金鋼粉の高強度化機構

Strengthening Mechanism of Cr Alloyed Steel Powder for High Strength Sintered Parts 宇波 繁（Shigeru Unami） 上ノ薗 聡（Satoshi Uenosono）

要旨 : 圧縮性が高く，焼結ままの熱処理なしで高強度が得られる 1Cr-0.3Mo-0.3V (mass％) 組成 のプレアロイ鋼粉「KIP 103V」を開発した。この新組成の鋼粉に黒鉛粉を 0.9 mass％ 添 加した焼結体は，焼結ままの熱処理なしで，熱処理材並の引張強さ 1 000 MPa，回転曲げ 疲れ強さ 310 MPa が得られた。この高強度化は，強度の高い極めて微細なパーライト組 織，Mn 酸化物の低減および微細な V 炭窒化物の析出に起因する。 Synopsis :

A prealloyed 1Cr-0.3Mo-0.3V (mass％) steel powder, KIP 103V, has been developed to obtain the high compressibility of powder and the high strength of sintered compacts without heat-treatment after sintering. The as-sintered steel without heat-treatment made from this new powder with 0.9 mass％ graphite addition gives as high strength as heat-treated sintered steel. Tensile strength is 1 000 MPa and the endurance limit of rotating bending fatigue strength is 310 MPa. The improvement of the strength is attributed to a narrow pearlite lamellar spacing, a decrease in manganese oxide and a precipitation hardening by vanadium carbonitrides.

(c)JFE Steel Corporation, 2003

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