Z. Xiu, A. Salwe ´n, X. Qin, F. He and X. Sun iron. The investigations of the Fe-B-C system indicate that optimisation of carbon and boron content will probably give The eVect of addition of Fe-B-C master alloy powders a better balance among strength, ductility and shrinkage.8 on the sintering behaviour of iron-molybdenum The Fe-B-C phase diagram shows a ternary eutectic sintered steels has been investigated by dilatometric reaction occurring at 1097°C.9 experiments. The addition of the Fe-B-C master alloy Boron enhanced sintering of the Fe-1•5Mo powder with or powders to the Fe-Mo-B-C sintered steels can without carbon addition was investigated in recent years.10-12 activate the sintering process by liquid phase sinter-Boron was added in the form of ferroboron Fe-18 wt-%B ing. Liquid phases form owing to the reaction c-Fe+ powder10 or elemental boron powder (<5 mm).11,12 Carbon (Fe,Mo) 2 B+Fe 3 (B,C)ä L at 1097°C and the reaction was introduced by the addition of graphite powder. Dudrova c-Fe+Mo 2 C+Fe 3 Cä L at 1085°C. The temperature et al.10 measured the area fraction of the solidi ed eutectic of the liquid phase formation depends on the comphase of the sintered Fe-1•5Mo-B and found that boron positions and the amount of the master alloy powders.forms a whole range of borides with molybdenum, i.e. SEMQ analysis for the Fe-1•2Mo-0•4B-0•5C (wt-%) Mo 2 B, MoB and MoB 2 . However, a full explanation of steel shows that grain boundary phase contains approxithe sintering behaviour of the Fe-Mo-B-C alloy system mately 5•0 wt-%Mo, much higher than that in the is diYcult since the interactions between elements are grains (approximately 0•95 wt-%Mo) and higher than complicated. that of the base powder Astaloy Mo (1•44 wt-%Mo).In the present study, the sintering behaviour and micro-This means that molybdenum diVuses from particle structure of iron-molybdenum sintered steels with addition to particle boundary to form borides and carbide of Fe-B-C ternary master alloy powders are investigated during sintering.PM/1020 by dilatometer experiments, scanning electron microprobe quantitative analysis (SEMQ) and scanning energy dispersive Dr Xiu
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