摘要
利用不同激光工艺参数对Ni-P-SiC化学复合镀层进行激光处理,运用扫描电镜、显微硬度计等对复合镀层基材的显微组织、硬度进行了综合分析,探讨了显微组织与硬度沿深度的变化规律。结果表明,当激光功率小于450 W,激光仅对镀层进行处理而对基材不产生影响;随着激光功率的加大,基材的显微组织及硬度发生了不同的变化。当激光功率大于450 W时,基材发生组织转变。500 W时基材表层组织为回火屈氏体+碳化物,显微硬度为350 HV0.1;当激光功率为550 W时基材表层组织为隐晶马氏体+碳化物,显微硬度为812 HV0.1,当激光功率为600 W时基材表层组织为针状马氏体+残留奥氏体,显微硬度为831 HV0.1。
Ni-P-SiC electroless composite coatings were treated by laser with different laser technological parameters. The microstructure and hardness of matrix beneath electroless composite coatings were analyzed synthetically with SEM and microhardness tester, and the variation of microstructure and hardness along the depth direction was discussed. The resuits show that the laser treatment is only applied to the coating and has no effects on the matrix when the laser power is below 450 W. While the microstructure and hardness of matrix change with increase of the laser power. When the laser power is above 450 W, the microstructure of matrix has changed. The surface microstructure of matrix is tempered troost- ite ＋ carbide and microhardness is 350 HV0.1, when the laser power is 500 W. The surface microstructure of matrix is cryptocrystalline martensite ＋ carbide and microhardness is 812 HV0.1 ,when the laser power is 550 W. And the surface microstructure of matrix is needle-shaped martensite ＋ retained austenite and microhardness is 831 HV0.1, when the laser power raises to 600 W.
出处
《金属热处理》
CAS
CSCD
北大核心
2008年第9期16-18,共3页
Heat Treatment of Metals
