Q&P工艺对Fe-0.45C-1.6B高硼耐磨钢组织和性能的影响

Effects of Q&P Process on Microstructure and Properties of Fe-0.45C-1.6BB High Boron Wear-resistant Steel

利用光学显微镜(OM)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射仪(XRD)、洛氏硬度计和冲击磨损试验机,研究了铸态和经Q&P工艺处理后的Fe-0.45C-1.6B高硼耐磨钢的组织和性能。结果表明,高硼耐磨钢的显微组织由金属基体和共晶硼化物组成。基体组织主要为马氏体,铁素体和少量残余奥氏体。硼化物主要为Fe_(2)B和Fe_(23)(B,C)_(6)。Q&P工艺后,铁素体被消除,合金元素分布均匀,硼化物的形态和分布随之发生变化。经Q&P工艺后,高硼耐磨钢的综合力学性能和耐磨性都得到改善。与铸态相比,Q&P工艺后高硼耐磨钢中残余奥氏体的体积分数由9.8%上升到17.6%,冲击吸收功由3.76 J上升至7.50 J,耐磨性为铸态时的1.64倍。

The microstructure and properties of the as-cast and after Q&P process Fe-0.45C-1.6B high boron wear-resistant steel were studied by means of optical microscope(OM),scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray diffractometer(XRD),Rockwell hardness tester and impact wear tester.The results show that the microstructure of high boron wear-resistant steel is composed of metal matrix and eutectic boride.The matrix structure is mainly martensite,ferrite and few retained austenite.The borides are mainly Fe_(2)B and Fe_(23)(B,C)_(6).After the Q&P process,the ferrite is eliminated,the alloying elements are uniformly distributed,and the shape and distribution of the boride changes accordingly.After the Q&P process,the comprehensive mechanical properties and wear resistance of the high-boron wear-resistant steel have been improved.Compared with the as-cast state,after the Q&P process,the volume fraction of retained austenite in the test steel increases from 9.8%to 17.6%,and the impact absorption energy increases from 3.76 J to7.50 J,and the wear resistance is 1.64 times of that of the as cast.