Influence of Base Material Microstructure on Liquation Cracks Sensitivity in Laser Deposition Repaired K4169 Alloy

Lanyun Qin; Heda Wang; Changfu Li; Yuhang Ren; Chao Wang; Guang Yang

doi:10.3788/CJL231572

Chinese Journal of Lasers, Volume. 51, Issue 10, 1002322(2024)

Influence of Base Material Microstructure on Liquation Cracks Sensitivity in Laser Deposition Repaired K4169 Alloy

Lanyun Qin1... Heda Wang1, Changfu Li2, Yuhang Ren2, Chao Wang2 and Guang Yang1,* |Show fewer author(s)

Author Affiliations

¹School of Mechatronic Engineering, Shenyang Aerospace University, Shenyang 110136, Liaoning, China

²Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process of Shenyang Aerospace University, Shenyang 110136, Liaoning, China

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Figures & Tables(18)

Fig. 1. Microstructure of base material (K4169 alloy in cast state) and micro-morphology of powder. (a) Microstructure of K4169 alloy in cast state; (b) micro-morphology of GH4169 spherical powder

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Fig. 2. Schematics of laser deposition repair experiment. (a) Schematic of laser deposition repair; (b) schematic of laser deposition scanning path

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Fig. 3. Schematic of tensile specimens

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Fig. 4. OM images of K4169 alloy base material in different heat treatment states. (a) Homogenization+solution+aging treated base material; (b) homogenization+hot isostatic pressing+solution+aging treated base material

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Fig. 5. SEM images of K4169 alloy base material in different heat treatment states. (a) Homogenization+solution+aging treated base material; (b) homogenization+hot isostatic pressing+solution+aging treated base material

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Fig. 6. XRD patterns of K4169 alloy base material in different heat treatment states

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Fig. 7. Liquefaction cracks in the heat-affected zone of repaired specimens of K4169 alloy in different heat treatment states. (a) Homogenization+solution+aging treated alloy; (b) homogenization+hot isostatic pressing+solution+aging treated alloy

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Fig. 8. Microstructures of heat-affected zone of repaired specimen of homogenization+solution+aging treated K4169 alloy

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Fig. 9. Liquation cracks in heat-affected zone of repaired specimen of homogenization+hot isostatic pressing+solution+aging treated K4169 alloy. (a) Overall crack morphology; (b)(c)(d) magnified view of cracks in different zones

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Fig. 10. Distribution of elements near liquation cracks in repaired specimen of homogenization+hot isostatic pressing+solution+aging treated K4169 alloy

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Fig. 11. Liquation crack generation mechanism for repaired specimen of homogenization+hot isostatic pressing+solution+aging treated K4169 alloy, where image Ⅰ shows phase dissolution stage, image Ⅱ shows eutectic liquefaction stage, and image Ⅲ shows eutectic solidification stage

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Fig. 12. Liquid film generation mechanism for repaired specimen of homogenization+solution+aging treated K4169 alloy, where image Ⅰ shows phase dissolution stage, image Ⅱ shows eutectic liquefaction stage, and image Ⅲ shows eutectic solidification stage

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Fig. 13. Microhardness of K4169 alloy repaired specimens with different heat treatment states

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Fig. 14. Tensile results of repaired specimens of K4169 alloy in different heat treatment states

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Table 1. Heat treatment of K4169 alloy

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Table 1. Heat treatment of K4169 alloy

No.	Heat treatment	Detail process
1	Homogenization+solution+aging	1065 ℃/1.5 h，AC+980 ℃/1 h，AC+720 ℃/8 h（50 ℃/h，FC）to 620 ℃/8 h，AC
2	Homogenization+hot isotropic pressing +solution+aging	1065 ℃/1.5 h，AC+1260 ℃/140 MPa/4 h，AC+980 ℃/ 1h，AC+720 ℃/8 h（50 ℃/h，FC）to 620 ℃/8 h，AC

Table 2. Chemical composition of K4169 alloy and GH4169 spherical powder
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Table 2. Chemical composition of K4169 alloy and GH4169 spherical powder
Material Mass fraction /%
Cr Ni Mo Al Ti Nb C
K4169 19.2 49.4 3.3 0.5 0.84 4.4 ≤0.1
GH4169 17‒21 50‒55 2.8‒3.3 0.2‒0.6 0.65‒1.15 4.4‒5.4 0.063

Table 3. Laser deposition repair (LDR) parameters
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Table 3. Laser deposition repair (LDR) parameters
Parameter Value
Power /W 1600
Scanning speed /（mm/s） 8
Feeding rate /（rad/min） 1
Layer thickness /mm 0.4
Overlap rate /% 40

Table 4. EDS results of precipitates in K4169 alloy in different heat treatment states

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Table 4. EDS results of precipitates in K4169 alloy in different heat treatment states

Regions in Fig. 5	Atomic fraction /%									Phase
Regions in Fig. 5	C	Al	Si	Ti	Cr	Fe	Ni	Nb	Mo	Phase
A	34.87	0.26	0.03	1.79	3.78	3.84	43.74	10.88	0.81	Laves
B	22.93	0.98	0.14	1.12	16.29	13.97	40.27	2.72	1.58	δ
C	59.61	0.03	0.03	6.07	0.40	0.32	1.10	32.19	0.24	（Nb，Ti）C
D	61.09	0.04	0.01	4.69	0.71	0.59	1.52	31.34	0	（Nb，Ti）C
E	18.82	1.00	0.12	0.94	17.61	15.10	42.47	2.42	1.52	δ

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Lanyun Qin, Heda Wang, Changfu Li, Yuhang Ren, Chao Wang, Guang Yang. Influence of Base Material Microstructure on Liquation Cracks Sensitivity in Laser Deposition Repaired K4169 Alloy[J]. Chinese Journal of Lasers, 2024, 51(10): 1002322

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