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Improvement of Mechanical Properties of Fe-Cr-Mo-Cu-Ni-C Sintered Sintered Steels by Sinter Hardening

机译:烧结硬化改善Fe-Cr-Mo- Cu-Ni -C烧结钢的力学性能

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The effect of high temperature sintering and high cooling rate on shifting the microstructural composition to the favourably of martensite-bainite structures and thus effective improvement of mechanical properties of sintered steels based on Astaloy CrL powder with an addition of 1 and 2% Cu or 50% Distaloy AB powder and 0.65% C was investigated. All the systems were processed by both sinter-hardening and conventional sintering. The vacuum sintering at high-temperature of 1240 ℃ and at common temperature of 1180 ℃ were integrated with high (6 ℃/s), medium (3 ℃/s) and slow (0.1 ℃/s) cooling rates; conventional sintering at 1180 ℃ with cooling rate of ~ 0.17℃/s was carried out in a N_2+10%H_2 atmosphere. In dependence on chemical composition, the yield and tensile strengths of 890-1150 MPa and 913-1230 MPa respectively and impact energy of 10-15 J were achieved by sinter-hardening. The yield and tensile strengths are approximately double than those resulting from conventional sintering.
机译:高温烧结和高冷却速率对显微组织成分有利地转变为马氏体-贝氏体组织的影响,从而有效地改善了基于添加1%和2%的Cu或50%的Astaloy CrL粉末的烧结钢的机械性能。研究了Distaloy AB粉和0.65%C。所有系统均通过烧结硬化和常规烧结进行处理。高温1240℃和普通1180℃的真空烧结结合了高(6℃/ s),中(3℃/ s)和慢(0.1℃/ s)冷却速率;在N_2 + 10%H_2气氛中,以1180℃的冷却速度〜0.17℃/ s进行常规烧结。根据化学组成,通过烧结硬化分别获得890-1150 MPa和913-1230 MPa的屈服强度和拉伸强度以及10-15 J的冲击能。屈服强度和抗拉强度大约是常规烧结所产生的屈服强度和抗拉强度的两倍。

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