(1. 江蘇大學(xué) 機械工程學(xué)院，鎮(zhèn)江 212013；
2. 江蘇聯(lián)冠科技發(fā)展有限公司，張家港 215624；
3. 東南大學(xué) 機械工程學(xué)院，南京 210000)
摘 要: 基于高速混合機槳葉所用奧氏體不銹鋼的失效情況，利用激光合金化技術(shù)在奧氏體不銹鋼上制備合金化強化耐磨層。利用光學(xué)顯微鏡、掃描電鏡、X射線衍射儀、顯微硬度計和光學(xué)分析儀研究合金化層的顯微組織、成分、物相、橫截面的硬度分布，同時利用正交試驗得到激光合金化技術(shù)的優(yōu)化參數(shù)。結(jié)果表明：當硬質(zhì)相Al2O3的含量為70%，激光功率為2 kW，掃描速度為15 mm/s時，合金化層的顯微硬度最大，達到440.8 HV0.1；所制備的合金化層無裂紋和氣孔等缺陷，與基體形成冶金結(jié)合；合金化層由枝晶和枝晶間共晶組成，其相組成為奧氏體、Al2O3、Cr7C3、Mn7C3和Mn2O3；合金化層的耐磨損性能較基體的顯著提高。
關(guān)鍵字: 槳葉；激光合金化；不銹鋼；磨損
（1. School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China;
2. Jiangsu Lianguan Science and Technology Development Co., Ltd, Zhangjiagang 215624, China;
3. School of Mechanical Engineering, Southeast University, Nanjing 210000, China）
Abstract:Based on the failure of austenitic stainless steel used in high-speed mixing blades, the laser alloying technique was used to fabricate the alloyed layer on stainless steel. The microstructure, composition, phases, microhardness of the cross-section of the alloyed layer were analyzed by OM, SEM, XRD, microhardness tester, optical profiling system, and the optimal parameter is obtained by the use of orthogonal. The results indicate that, the highest hardness is 440.8 HV0.1 when the content of Al2O3, the laser power and laser scanning speed are 70%, 2 kW and 15 mm/s, respectively. The alloyed layer is free of cracks with good processability, the alloyed layer is composed of dendrites and eutectic, the phases are austenite, Al2O3, Cr7C3, Mn7C3 and Mn2O3. The wear resistance of alloyed layer increases significantly.
Key words: blade; laser alloying; stainless steel; wear
