镧对衬板钢在腐蚀料浆环境下的冲击腐蚀性能与机理的影响

Effect of Lanthanum on Impact Wear Behavior and Mechanism of Liner-board Steels in Corrosive Slurry

利用改造后的MLD-10型冲击腐蚀试验机,研究了含有一定镧元素的改性高锰钢和高锰钢冶金矿山衬板钢在铁矿石酸性矿浆中的冲击腐蚀磨损行为;采用扫描电子显微镜观察了试样磨损表面形貌,用光学显微镜分析了垂直于试样磨损表面的亚表层金相组织。结果表明,在冲击功为1.2J的模拟工况下,改性高锰钢的耐冲击腐蚀磨损性能要优于高锰钢。从磨损失效机理来看,改性高锰钢试样腐蚀磨损机理前期为微观切削、微观犁皱,其后则主要为应力腐蚀引起的剥落。高锰钢试样腐蚀磨损机理为微观犁皱和加工硬化作用造成的材料剥落。

The impact corrosion and abrasion behavior of high manganese steel and modified high manganese steel containing some Lanthanum used as the liner of wet-grinders in acidic-ironstone slurry and at impact energy of 1.2 J was investigated using modified impact corrosive test rig. The worn surface morphologies of the steels were observed using scanning electron microscope, while the worn sub-surface cross-sections of the steels after impact corrosive abrasion in the acidic-ironstone slurry were analysed using an optical microscope. It is found that the modified high manganese steel has much better impact corrosion and abrasion properties compared with the high manganese steel. Moreover, the mechanism of the modified high manganese steel is micro-cutting and micro-plough at earlier stage, and changes into stress-abrasion spalling at later stage. While the mechanism of the high manganese steel is the micro-plough and work-hardening spalling.