摘要
采用选区激光熔化技术(selective laser melting,SLM)制备了GH3230镍基高温合金,研究了工艺参数对GH3230镍基高温合金成形缺陷的影响。结果表明,在扫描速度为900 mm/s、激光功率210 W、扫描间距0.09 mm、铺粉层厚度0.04 mm的工艺条件下,成形试样的孔隙率达到最小值(0.0108%)。随后对最佳参数试样进行了固溶处理,研究固溶处理对试样微观组织和力学性能的影响。结果表明,进行固溶处理后的试样表面会析出大量连成线状的碳化物颗粒,随着保温时间的延长,碳化物颗粒尺寸及数量呈现先增长后降低的趋势,合金内部发生再结晶现象,与此同时,试样屈服强度由421.8 MPa降低至347.8 MPa,抗拉强度由763.4 MPa降低至678.9 MPa,而延伸率由17.19%增长至21.2%,合金强度降低而塑性升高。固溶处理不能消除打印缺陷。
GH3230 nickel-based superalloy was prepared by selective laser melting(SLM).The influence of process parameters on forming defects of GH3230 nickel-based superalloy was studied.The results show that when the scanning speed is 900 mm/s,the laser power is 210 W,the scanning distance is 0.09 mm,and the thickness of the powder layer is 0.04 mm,the minimum porosity of the formed sample is 0.0108%.The results of the study on the effect of solution treatment on the microstructure and mechanical properties of the samples with the best parameters show that a large number of linear carbide particles will be deposited on the surface of the GH3230 superalloy formed after solution treatment.With the extension of holding time,the size and number of carbide particles will first increase and then decrease,and recrystallization will occur in the alloy.At the same time,the yield strength and tensile strength of molded specimens decreased from 421.8 MPa to 347.8 MPa,from 763.4 MPa to 678.9 MPa,and the elongation increased from 17.19%to 21.2%.The strength of the alloy decreases while the plasticity increases.
作者
闫梦喆
席鑫
李霄
路永新
林丹阳
宋晓国
YAN Mengzhe;XI Xin;LI Xiao;LU Yongxin;LIN Danyang;SONG Xiaoguo(Xi'an Shiyou University,Xi'an 710065,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology(Weihai),Weihai 264209,China)
出处
《电焊机》
2023年第9期116-123,共8页
Electric Welding Machine
基金
国家自然科学基金(52205348)
山东省自然科学基金(ZR2022QE087)。
