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    • 25. 发明授权
    • Free-cutting Ni-base heat-resistant alloy
    • 易切削Ni基耐热合金
    • US06752883B2
    • 2004-06-22
    • US10158167
    • 2002-05-31
    • Kiyohito IshidaKatsunari OikawaShigeki UetaToshiharu NodaTakashi Ebata
    • Kiyohito IshidaKatsunari OikawaShigeki UetaToshiharu NodaTakashi Ebata
    • C22C1905
    • C22C19/056C22C19/053C22C19/055C22C19/058
    • A free-cutting Ni-base heat-resistant alloy excellent in the high-temperature strength and corrosion resistance was proposed. The alloy contains Ni as a major component, 0.01 to 0.3 wt % of C and 14 to 35 wt % of Cr, and further contains at least one element selected from Ti, Zr and Hf in a total amount of 0.1 to 6 wt %, and S in an amount of 0.015 to 0.5 wt %. The alloy has dispersed in the matrix thereof a machinability improving compound phase, where such phase contains any one of Ti, Zr and Hf as a major constituent of the metal elements, essentially contains C and either S or Se as a binding component for such metal elements. The alloy also satisfies the relations of WTi+0.53WZr+0.27WHf>2WC+0.75WS and WC>0.37WS, where WTi represents Ti content (wt %), WZr represents Zr content (wt %), WHf represents Hf content (wt %), WC represents C content (wt %) and WS represents S content (wt %). This successfully suppresses the amount of free S residing in the alloy, which results in an improved machinability while preventing the hot workability from being degraded.
    • 提出了具有优异耐高温和耐腐蚀性的易切削Ni基耐热合金。 该合金含有Ni作为主要成分,0.01〜0.3重量%的C和14〜35重量%的Cr,还含有选自Ti,Zr和Hf中的至少一种元素,总量为0.1〜6重量% 和S为0.015〜0.5重量%。 该合金在其基体中分散有可机械加工的化合物相,其中这种相含有Ti,Zr和Hf中的任何一种作为金属元素的主要成分,基本上含有C和S或Se作为这种金属的结合成分 元素。 该合金还满足WTi + 0.53WZr + 0.27WHf> 2WC + 0.75WS和WC> 0.37WS的关系,其中WTi表示Ti含量(wt%),WZr表示Zr含量(wt%),WHf表示Hf含量(wt %),WC表示C含量(wt%),WS表示S含量(wt%)。 这成功地抑制了存在于合金中的游离S的量,这导致改善的机械加工性,同时防止热加工性降低。