摘要
采用电极感应气雾化方法制备新型高强度双相钢粉末。设计了以雾化压力、熔炼功率和气体加热温度为变量的正交试验方案,在不同条件下制备得到高强度双相钢粉末。利用扫描电镜(SEM)、激光粒度分析仪、氮氧分析仪和霍尔流速计对不同条件下所获粉末进行测试分析,得到了雾化压力、熔炼功率和气体加热温度对粉末的表面形貌、球形度、粒度分布、氧氮含量和流动性的影响规律。结果表明优化工艺下制备的高强度双相钢粉末综合质量良好。最优工艺下粉末氧含量约44 ppm,氮含量约655 ppm,粉末平均粒径不超过100μm,粉末流动性优于14 s/50 g。利用该粉末在2205双相不锈钢基体表面进行激光增材试验,所制备的熔覆体材料沿扫描方向的抗拉强度约910 MPa,延伸率约30%,横截面维氏显微硬度为300 HV^360 HV。
A new type of intensive duplex steel powder was preparation by the EIGA.An orthogonal test scheme with atomization pressure,melting power and gas heating temperature as variables was designed to prepare intensive duplex steel powder under different conditions.The effects of atomization pressure,melting power and gas heating temperature on the surface morphology,sphericity,particle size distribution,nitrogen and oxygen content and fluidity of the powder were analyzed by means of SEM,laser particle size analyzer,nitrogen and nitrogen analyzer and hall velocity meter.The results show that the comprehensive quality of intensive duplex steel powder prepared by the optimized process is good.Under the optimal process,the powder oxygen content is about 44 ppm,nitrogen content is about 655 ppm,the average particle size of the powder is less than 100μm,and the powder fluidity is better than 14 s/50 g.The powder was used to conduct laser additive test on 2205 duplex stainless steel substrate surface.The tensile strength of the prepared cladding body along the scanning direction was about 910 MPa,the elongation was about 30%,and the cross-section vickers microhardness was 300 HV^360 HV.
作者
温家浩
张林杰
张建勋
薛飞
朱红梅
Wen Jiahao;Zhang Linjie;Zhang Jianxun;Xue Fei;Zhu Hongmei(State Key Laboratory of Metal Material strength XI’an Jiaotong University,XI’an 710049,China;State Key Laboratory of Mechanical Manufacturing System Engineering Xi'an Jiaotong University,Xi'an 710049,China;University of South China School o f Mechanical Engineering.Heng yang 421000,China)
出处
《应用激光》
CSCD
北大核心
2020年第3期377-386,共10页
Applied Laser
基金
国家重点研发计划(项目编号:2018YFB1105800)。
