Boron is a feasible alloying element for liquid phase sintering (LPS) of powder metallurgy (PM) steels. This study investigated the effect of nickel (Ni), which is widely used in PM steels, on the liquid phase sintering of boron-containing PM steels. The results showed that the addition of 1.8wt% Ni does not apparently modify the LPS mechanism of boron-containing PM steels. However, adding 1.8wt% Ni slightly improves the LPS densification from 0.60 g/cm3 to 0.65 g/cm3, though the green density is reduced. Thermodynamic simulation demonstrated that the presence of Ni lowers the temperature region of liquid formation, resulting in enhanced LPS densification. Moreover, original graphite powders remains in the steels sintered at 1200 ºC. These graphite powders mostly dissolve into the base iron powder when the sintering temperature is increased from 1200 ºC to 1250 ºC.
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机译：硼是用于粉末冶金（PM）钢的液相烧结（LPS）的可行合金元素。这项研究调查了在PM钢中广泛使用的镍（Ni）对含硼PM钢的液相烧结的影响。结果表明，添加1.8wt％Ni显然不会改变含硼PM钢的LPS机理。然而，尽管降低了生坯密度，但添加1.8wt％的Ni会使LPS的密度从0.60 g / cm3略微提高到0.65 g / cm3。热力学模拟表明，镍的存在降低了液体形成的温度范围，从而增强了LPS的致密化。此外，原始石墨粉残留在1200ºC烧结的钢中。当烧结温度从1200ºC升高到1250ºC时，这些石墨粉大部分溶解在基础铁粉中。
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