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将经过氧化、氮碳共渗及喷砂等不同表面处理的热作模具钢(H13和EX1)试样浸入铝合金液进行熔损试验。用扫描电子显微镜(SEM)和X射线能谱分析仪(EDS)对试样表层结合界面进行显微组织观察和腐蚀产物成分分析。结合差式扫描量热(DSC)分析技术,监测反应过程中的热量变化,研究这3种常用表面处理工艺对压铸模具钢耐热铝侵蚀性能的影响。结果表明:氧化处理所形成的氧化层可以有效提高模具钢的耐热铝侵蚀性能,氮碳共渗所形成的渗氮层则减弱了模具钢的耐热铝侵蚀性能,喷砂处理后表层的形变强化层及残余压应力基本不影响模具钢的耐热铝侵蚀性能。
The samples of hot work die steel (H13 and EX1) with different surface treatments such as oxidation, nitrocarburizing and sandblasting were immersed in the aluminum alloy melt to carry out the melting loss test. Microstructure observation and composition analysis of corrosion products were carried out on the bonding interface of the samples by scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDS). Combined with differential scanning calorimetry (DSC) analysis, the heat changes during the reaction were monitored, and the effects of these three common surface treatments on the heat-resistant aluminum erosion resistance of die-cast die steel were investigated. The results show that the oxide layer formed by the oxidation treatment can effectively improve the heat-resistant aluminum corrosion resistance of the die steel. The nitriding layer formed by nitrocarburizing weakens the heat-resistant aluminum corrosion resistance of the die steel. After the sand blasting, Deformation strengthening layer and the residual compressive stress basically does not affect the die steel heat-resistant aluminum erosion.