ABSTRACT This paper addresses the relation between mechanical properties and tribological behaviour of self-lubricating steels produced by in-situ dissociation of SiC. Literature shows that an increase in the mechanical strength of these materials lowers their friction coefficient and wear rates. These works have studied steels with mechanical strength up to 800 MPa, but it is unclear if this trend continues with further increments of mechanical strengths. To tackle this question, self-lubricating steels with Ni and Mo were sintered, half of the samples with 8 wt-% Ni were treated cryogenically hardened. Results show that this trend does not escalate with mechanical strength, furthermore, when ductility is low, graphite reservoirs are not easily accessed, and lubrication is incomplete. Also, plastic deformation allows to better distribute the load of the counter body at the surface, which reduces the wear rates of the specimens and the counter bodies.

中文翻译：

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Ni添加和低温硬化对MIM生产的自润滑钢力学和摩擦学性能的影响

摘要 本文讨论了由 SiC 原位解离生产的自润滑钢的机械性能和摩擦学行为之间的关系。文献表明，这些材料机械强度的增加会降低它们的摩擦系数和磨损率。这些工作研究了机械强度高达 800 MPa 的钢，但尚不清楚这种趋势是否会随着机械强度的进一步增加而继续。为了解决这个问题，烧结含有 Ni 和 Mo 的自润滑钢，含有 8 wt-% Ni 的样品的一半经过低温硬化处理。结果表明，这种趋势不会随着机械强度的增加而增加，此外，当延展性较低时，石墨储层不易进入，润滑不完全。还，