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通过金相显微镜、SEM、TEM等研究了裂解连杆用高碳微合金钢的组织、非金属夹杂物、沉淀析出相、机械性能及裂解表面特征。结果表明,开发的高碳微合金钢组织是由珠光体和少量的铁素体组成,钢中的非金属夹杂物主要是MnS,沉淀析出相主要为VC、VN、(Mn,Cu)S等;拉伸试验表明这种钢具有高强度和低塑性,连杆裂解试验表明断口表面为脆性解理断裂特征。
The microstructure, non-metallic inclusions, precipitated phases, mechanical properties and cracking surface characteristics of high carbon microalloyed steel for cracked connecting rods were studied by means of metallographic microscope, SEM and TEM. The results show that the microstructure of high carbon microalloyed steel is composed of pearlite and a small amount of ferrite. The nonmetallic inclusions in the steel are mainly MnS. The precipitated phases are mainly VC, VN, (Mn, Cu) S and so on Tensile tests show that this kind of steel has high strength and low plasticity, and the rod cracking test shows that the fracture surface is characterized by brittle cleavage fracture.