合金化处理对高碳高锰钢组织与性能的影响

Effect of Alloying Treatment on Microstructures and Mechanical Properties of a high Carbon high Manganese Steel

为进一步提高锻造高碳高锰钢的耐磨性,对锻造高碳高锰钢进行了Cr、Mo、V、Al元素的合金化处理.采用金相组织分析、机械性能测试、断口形貌观察及耐磨性测试等手段研究了Cr、Mo、V、Al合金化后高碳高锰钢的组织与性能.结果表明:合金化处理能使高锰钢的晶粒明显细化,并使高锰钢在保持良好塑性及冲击韧性的同时,其屈服强度和抗拉强度也得以较大程度的提高.与高锰钢相比,合金高锰钢的屈服强度和抗拉强度分别提高了31%和11%,达到550和955MPa.此外,合金化处理能够明显提高高锰钢的耐磨性及其磨损后的表面硬度.高锰钢、合金高锰钢和贝氏体钢的失重量均随磨损时间的增加而增加,并且三者的表面硬度均呈现出先增加后稳定的趋势,其中合金高锰钢的失重量最低且其磨损后的表面硬度最高.磨损后高的表面硬度是合金高锰钢耐磨性提高的主要原因.

To further improve the wear resistance of forged high carbon high manganese steel,Cr,Mo,V and Al elements were added into a high carbon high manganese steel.The metallographic observations,mechanical properties testing and wear resistance testing of the alloyed high carbon high manganese steel deformed in tension were carried out.The results show that the grain size of the high manganese steel is refined obviously,and the yield strength and tensile strength are also improved greatly with good ductility and impact toughness.Comparing with the high manganese steel,the yield strength and tensile strength of the alloyed high carbon high manganese steel are 550MPa and 955MPa with the increase of 31%and11%respectively.In addition,the alloying treatment improves notably the wear resistance and surface hardness.With the increase of wear time,the weight loss of the high manganese steel,alloyed high carbon high manganese steel and bainitic steel is increased.The surface hardness test results reveal a tendency to increase first and then stabilize,and the alloyed high carbon high manganese steel performs the highest surface hardness with the lowest weight loss.The high surface hardness resulted friction is the main reason for improving the wear resistance of the alloy high manganese steel.