激光成形修复Inconel 625合金的工艺特性和组织研究
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摘要
对激光成形修复Inconel 625合金的工艺特性以及不同区域的组织进行了研究。结果表明:激光成形修复Inconed625合金的工艺范围较宽;激光功率主要影响单道修复层的宽度;扫描速度对单道修复层的尺寸影响较为显著,而送粉率的影响较小。基材的相组成包括γ(Ni-Cr)基体相、大尺寸(约10μm)块状MC型碳化物(M为Nb和Ti)、沿晶界析出的小尺寸(约0.5μm)块状MC型碳化物以及不规则形状的Laves相。修复区组织为呈外延生长的柱状枝晶,相组成为γ基体相、沿枝晶界析出的Laves相以及少量MC型碳化物。层与层界面处Laves相析出急剧增加形成层间过渡区。
The process parameters and microstructure of the laser forming repaired(LFR) samples of Inconel 625 alloy were investigated.The results show that a wide range of process parameters are suitable for the laser forming repairing of Inconel 625 alloy. The laser power mainly affects the width of single track LFR samples. The scanning velocity has significant effect on the size of single track LFR samples.The powder feeding rate has less effect on the size of single track LFR samples. The interface between the substrate and laser repaired zone(LRZ) shows a metallurgical bonding. The phases in the substrate mainly include the y(Ni-Cr) matrix, MC(NbC, TiC) carbides with bimodal sizes of about 10 μm and 0.5μm, and Laves phase. In the LRZ, columnar dendrites grow epitaxially from the substrate, approx following the deposition direction. The phases in LRZ mainly consist of γ matrix, Laves phase and a small amount of MC carbides. Due to the increase of nucleation sites, a large amount of Laves phase are precipitated in the layer interface and track interface.
The process parameters and microstructure of the laser forming repaired(LFR) samples of Inconel 625 alloy were investigated.The results show that a wide range of process parameters are suitable for the laser forming repairing of Inconel 625 alloy. The laser power mainly affects the width of single track LFR samples. The scanning velocity has significant effect on the size of single track LFR samples.The powder feeding rate has less effect on the size of single track LFR samples. The interface between the substrate and laser repaired zone(LRZ) shows a metallurgical bonding. The phases in the substrate mainly include the y(Ni-Cr) matrix, MC(NbC, TiC) carbides with bimodal sizes of about 10 μm and 0.5μm, and Laves phase. In the LRZ, columnar dendrites grow epitaxially from the substrate, approx following the deposition direction. The phases in LRZ mainly consist of γ matrix, Laves phase and a small amount of MC carbides. Due to the increase of nucleation sites, a large amount of Laves phase are precipitated in the layer interface and track interface.
引文
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[5]Wang P,Zhang B C,Tan C C et al.Materials&Design[J],2016,112:290
[6]Xue Lei(薛蕾),Chen Jing(陈静),Lin Xin(林鑫)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2011,40(7):1225
[7]Lin X,Cao Y Q,Wu X Y et al.Materials Science and Engineering A[J],2012,553:80
[8]Sui S,Chen J,Fang E X et al.Materials Science and Engineering A[J],2017,588:480
[9]Xue Lei(薛蕾),Chen Jing(陈静),Zhang Fengyin(张凤英)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2006,35(11):1817
[10]Jiang Chengyu(蒋成禹),Wu Mingfang(吴铭方),Yu Chun(余春)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2003,32(4):295
[11]Yu Zhishui(于治水),Qi Kai(祁凯),Li Ruifeng(李瑞峰)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2003,32(12):1049
[12]Liu Fenggang(刘丰刚),Lin Xin(林鑫),Song Kan(宋衎)et al.Acta Metallurgica Sinica(金属学报)[J],2017,53(3):325
[13]Lin Xin(林鑫),Xue Lei(薛蕾),Chen Jing(陈静)et al.China Supface Engineering(中国表面工程)[J],2009,22(1):19
[14]Liu Q,Wang Y D,Zheng H et al.Optics&Laser Technology[J],2016,82:1
[15]Wang L,Wang N.Acta Materialia[J],2016,104:250
[16]Xu Qingdong(徐庆东),Lin Xin(林鑫),Song Menghua(宋梦华)et al.Acta Metallurgica Sinica(金属学报)[J],2013,49(5):605
[17]Henderson M B,Arrell D,Larsson R et al.Science and Technology of Welding and Joining[J],2004,9(1):13
[18]Dinda G P,Dasgupta A K,Mazumder J.Materials Science and Engineering A[J],2009,509:98
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[20]Xu F J,Lv Y H,Xu B S et al.Materials&Design[J],2013,45:446
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