CAJ | 학술논문

本文采用在铸铁轧辊表面上激光熔化预置的合金粉末来改善铸铁轧辊的表面性能.使用金相、扫描电镜和显微硬度计对激光熔化区的显微组织和硬度进行了测试表征.结果表明,激光熔化区与基体形成了冶金结合.由于激光的快速加热和快速冷却造成熔化区的组织细化.激光处理区的硬度由于晶粒细小和强化相的存在而得到提高.经450℃×48h高温回火处理后,激光熔化区的硬度几乎不发生改变.
본문채용재주철알곤표면상격광용화예치적합금분말래개선주철알곤적표면성능.사용금상、소묘전경화현미경도계대격광용화구적현미조직화경도진행료측시표정.결과표명,격광용화구여기체형성료야금결합.유우격광적쾌속가열화쾌속냉각조성용화구적조직세화.격광처리구적경도유우정립세소화강화상적존재이득도제고.경450℃×48h고온회화처리후,격광용화구적경도궤호불발생개변.
The paper presents laser surface melting of preplaced powder in order to change the surface layer properties of a medium-Ni-Cr infinite cast iron roll. Metallographical(OM and SEM),as well as microhardness investigations are presented as an illustration showing the benefits of laser application in modification of cast iron roll surface layer properties. The results showed that the modified coating combines metallurgically with the substrate. The fine microstructure of the melted zone were attributed to high cooling rates due to the short interaction time with the laser and relatively small volume of the melted materials. An increase in microhardness of the laser treated zone after laser melting may be attributed to fine precipitates formed in melted zone and to the transformation of retained austenite. After tempering 48h treatment under 450℃, the hardness almost didn't varied.