利用Gleeble-3500型热模拟试验机,对4Cr2Mo2W2V热作模具钢进行了高温抗压性能试验,并与3Cr2W8V钢及H13钢进行了对比;结合高分辨透射电镜、能谱仪和内耗仪,对其组织结构、碳化物种类、尺寸及弹性模量进行了研究。结果表明：在较高温度下（700℃）,4Cr2Mo2W2V钢的弹性模量和高温抗压性能都高于3Cr2W8V钢和H13钢的;淬回火后,该钢的马氏体板条细小,组织中只存在较多细小的MC型碳化物,锰和铬元素大部分都溶入了基体中,提高了固溶强化作用,有效增强了高温抗压性能。
Using Gleeble-3500 thermal simulation testing machine,high temperature compression tests were performed on hot die steel 4Cr2Mo2W2V.Then properties of the steel were compared with those of the 3Cr2W8V steel and H13 steel.Combining with TEM,EDS and internal friction equipment,the steel structure,shape and size of carbides as well as elastic modulus were analyzed.The results show that compared with H13 steel and 3Cr2W8V steel,4Cr2Mo2W2V steel had higher elastic modulus and high temperature compression performance at 700 ℃.The steel had fine martenite laths,carbides were mainly composed of small globular MC after quenching and tempering.Mn and Cr were primary dissolving in matrix,that increased the solution strengthenning effect which improved the high temperature compression performance.
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