摘要
铸造高锰钢是应用非常广泛的耐磨材料之一,但是由于铸造高锰钢存在缩松、气孔、晶粒粗大等铸造缺陷,导致其存在力学性能降低、服役稳定性差等难题。为了减少铸造高锰钢辙叉孔洞类缺陷和细化奥氏体晶粒,研究了锻焊和形变热处理(FW&TMCP)对铸造高锰钢辙叉耐磨性的影响,首先对铸造高锰钢和FW&TMCP高锰钢进行常规拉伸性能测试,然后在不同载荷作用下对铸造高锰钢和FW&TMCP高锰钢进行摩擦磨损试验。结果表明,FW&TMCP高锰钢的强塑性远高于铸造高锰钢,应变硬化速率也高于铸造高锰钢。微观组织结果显示FW&TMCP高锰钢的孔洞类缺陷减少了82%,致密度大幅提高。随着摩损载荷的增大,两种状态高锰钢摩擦因数均逐渐减小。在施加相同磨损载荷时,铸造高锰钢的摩擦因数小于FW&TMCP高锰钢;FW&TMCP高锰钢的塑性变形程度更小,耐磨性更高。随着磨损载荷的增大,两种状态高锰钢的磨损机制均由粘着磨损转变为磨粒磨损。
Casting high manganese steel is one of the widely used wear-resistant materials.However,due to casting defects such as shrinkage porosity,porosity,and coarse grains in cast high manganese steel,it has problems such as reduced mechanical properties and poor service stability.In order to reduce the defects of cast high manganese steel frog holes and refine the austenite grains,the effect of forge welding and thermomechanical heat treatment(FW&TMCP)on wear resistance of the cast high manganese steel frogs was studied.First,the conventional tensile properties of the cast high manganese steel and FW&TMCP high manganese steel were tested and then friction and wear test of the cast high manganese steel and FW&TMCP high manganese steel were carried out under different loads.The results show that the strength and plasticity of the FW&TMCP high manganese steel are much higher than that of the cast high manganese steel,and the strain hardening rate is also higher than that of the cast high manganese steel.The microstructure results show that the porosity of the FW&TMCP high manganese steel is reduced by 82%,and the density is increased greatly.The friction coefficient of the two high manganese steel decreases gradually with the increase of wear load.Under the same wear load,the friction coefficient of the cast high manganese steel is less than that of the FW&TMCP high manganese steel,and the FW&TMCP high manganese steel has less plastic deformation and higher wear resistance.The wear mechanism of the two high manganese steel changes from adhesive wear to abrasive wear with the increase of wear load.
作者
林芷青
张福成
马华
王琳
陈晨
徐明
Lin Zhiqing;Zhang Fucheng;Ma Hua;Wang Lin;Chen Chen;Xu Ming(State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao Hebei 066004,China;China Railway Shanhaiguan Bridge Group Co.,Ltd.,Qinhuangdao Hebei 066205,China)
出处
《金属热处理》
CSCD
北大核心
2021年第8期92-98,共7页
Heat Treatment of Metals
基金
河北省研究生创新资助项目(019000731)
河北省重点研发计划(19211018D)
国家自然科学联合基金(U1810207)。
关键词
铸造高锰钢
锻焊和形变热处理
强度
塑性
耐磨性
as-cast high manganese steel
forging welding and thermomechanical treatment(FW&TMCP)
strength
plasticity
wear resistance
