热处理工艺对新型抗菌刀具用钢微观组织和性能的影响

以实验室研发的高碳高铬50Cr15MoV含Cu抗菌刀具用钢为研究材料,采用光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)、X射线衍射仪(XRD)和维氏硬度计研究了其在不同热处理工艺下的微观组织和力学性能变化,探索了50Cr15MoV含Cu新型刀具用钢最佳热处理工艺。结果表明,50Cr15MoV含Cu刀具用钢的硬度在正火温度低于1050 ℃时逐渐升高,高于1050 ℃后逐渐降低,并随着回火温度的升高而逐渐下降,同时,50Cr15MoV含Cu刀具用钢经过500 ℃时效30 min后,由于富Cu相的析出,获得良好的抗菌性能,因此50Cr15MoV含Cu刀具用钢最佳热处理工艺为1050 ℃正火保温30 min后油淬+200 ℃回火保温90 min后空冷+500 ℃时效30 min后空冷。

Influence of heat treatment process on microstructure and properties of a new type antibacterial tool steel

Microstructure and mechanical properties of 50Cr15MoV antibacterial stainless steel with Cu contained were studied by using optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD) and Vickers hardness tester. The results show that the hardness of the tested steel increases initially and then decreases with the increase of normalizing temperature; whereas the hardness gradually decreases with the increase of tempering temperature. Besides, after aged at 500 ℃ for 30 min, Cu-rich particles precipitate out so resulting in a good antibacterial performance of the steel. The optimum heat treatments are correspondingly determined as normalizing at 1050 ℃ for 30 min and oil cooling, then tempering at 200 ℃ for 90 min and air cooling, lastly aging at 500 ℃ for 30 min then air cooling.