Cr含量对低碳合金钢在腐蚀条件下冲击和磨损特性的影响

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Impact corrosion and abrasion properties of the low carbon alloy steels with different chromium content under the simulated working condition of metallurgical industry were investigated by a MLD-10 impact-corrosionabrasion tester.The slurry was the mixture of the dilute sulfuric acid with pH value 2.5 and the ironstone with 1.7～3.3 mm in diameter.The impact energy was 1.2 J.By analyzing the morphology of worn surfaces and the metallographs of the subsurface of the specimen,the impact corrosion and abrasion mechanism of the three steels was investigated.The results showed that the weight loss of the low carbon alloy steels decreased with the increment of the chromium content.At the impact energy of 1.2 J,the impact corrosion and abrasion mechanism of low carbon alloy steel with 3% Cr content is the deforming fatigue wear,the mechanism of low carbon alloy steel with 6% Cr content is that shallow spallation due to accumulated deformation for a shorter time and removal of surface material due to multiple plastic deformation for a longer time,multiple plastic deformation belongs to the mechanism of low carbon alloy steel with 9% Cr content.含Cr量不同的低碳合金钢的冲击腐蚀和磨损特性在冶金工业的模拟工作状况下是由混合层深度为10的冲击腐蚀磨损试验机来检测的。该浆料是由Ph值为2.5的稀硫酸和直径为1.7～3.3mm的铁矿石混合而成,冲击能为1.2J。通过分析磨损表面的形态和样品次表层的金相组织,来分析3种钢制样品的冲击腐蚀和磨损特性。实验结果表明,在冲击能为1.2J条件下,含Cr量为3的低碳合金钢的冲击腐蚀和磨损特性是疲劳磨损变形。含Cr量为6的低碳合金钢由于短时间的累积变形而产生裂纹,由于长时间的多塑性变形而产生表面材料的脱落,而含Cr量为9的低碳合金钢的疲劳磨损特性是多塑性变形。低碳合金钢的质量损失随Cr含量的增加而减少,低碳钢的耐磨性随Cr含量的增加而提高。