Transactions of Materials and Heat Treatment

Title：Practicability analysis on St6 cobalt-based alloy fuel injector nozzle for SLM 3D print

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ClassificationCode：TG316.2

year,vol(issue):pagenumber：2021,46(3):158-161

Abstract：

The test schemes of different Selective Laser Melting (SLM) processes for 3D print of St6 cobalt-based alloy fuel injector nozzle were designed and compared, and the process feasibility of 3D print for St6 cobalt-based alloy fuel injector nozzle was analyzed by checking the surface quality and microstructure after HIP. According to the printing defects such as surface spheroidization、interlayer cracking、loose internal structure、internal cracks、precipitation accumulation, etc., it was demonstrated that the main reasons for process incompatibility of original 3D print for St6 cobalt-based alloy fuel injector nozzle were excessive C content、changeing chemical component and poor fluidity during melt forming. Then, the manufacturing scheme was optimized by adjusting the chemical composition of St6 cobalt-based alloy and SLM process parameters with the power of 400 W and the HS of 125 μm. After powder optimizing, SLM 3D printing fuel injector nozzle samples and HIP, the test results show that the microstructure analysis, room temperature mechanical properties, high temperature mechanical properties and high temperature fatigue tests are found satisfactory, and the manufacturing quality meets the design requirements.

Funds：

工信部船用低速双燃料机原理样机研制（CDGC01-KT0310）

孙常奋（1965-），男，硕士，高级工程师 E-mail：13601838731@126.com

Reference：

[1]陈超越，王晓冬，王江，等. 激光选区熔化技术在钴基高温合金制备中的应用进展[J]. 科技导报，2020,38（2）：19-25.

Chen C Y, Wang X D, Wang J, et al. Progress on application of selective laser melting in preparation of cobaltbased superalloy [J]. Science & Technology Review, 2020, 38(2): 19-25.

[2]陶锡麒，潘邻，夏春怀，等. 激光熔覆用钴基合金粉末的研究[J]. 材料保护，2002，35（10）：28-29.

Tao X Q, Pan L, Xia C H, et al. Cobalt based alloy powder for laser cladding [J]. 2002, 35(10): 28-29.

[3]李延葆.压力堆堆内构件钴基合金堆焊工艺研究[M]. 上海：上海交通大学，2018.

Li Y B. Study on Cobased Hardfacing Process of Pressurized Water Reactor Internals [M]. Shanghai: Shanghai Jiao Tong University, 2018.

[4]高佳伟，李晶，史成斌. 固溶处理对Stellite6B钴基高温合金中碳化物的影响[J]. 金属热处理，2018，43（2）：62-67.

Gao J W, Li J, Shi C B. Effect of solution treatment on carbides in cobaltbase super alloy Stellite6B [J]. Heat Treatment of Metals, 2018, 43(2): 62-67.

[5]黄宗炼，王博，刘飞，等. 选区激光熔化工艺参数对Co-25Cr-5Mo-5W合金结构与性能的影响[J]. 粉末冶金材料科学与工程，2018，23（6）：582-590.

Huang Z L, Wang B, Liu F, et al. Effect of processing parameters on microstructure and mechanical properties of Co-25Cr-5Mo-5W alloy by selective laser melting [J]. Powder Metallurgy Materials Science and Engineering, 2018, 23(6): 582-590.

[6]邹国伟，王刚，马致远. STELLITE6大面积堆焊工艺的研究[J].金属加工：热加工，2008，（22）：45-48,58.

Zou G W, Wang G, Ma Z Y. Research on the technology of STELLITE6 large area surfacing [J]. MW Metal Forming，2008，(22): 45-48, 58.

[7]吕松涛，苏义祥，尹章轩，等.烧结温度和保温时间对钴基合金组织与性能的影响[J]. 铸造技术,2019, 40（3）：13-15.

Lyu S T, Su Y X, Yin Z X, et al. Effect of sintering temperature and holding time on the structure and property of Cobased alloy [J]. Foundry Technology, 2019, 40(3): 13-15.

[8]Yang F M, Sun X F, Guan H R. Fatigue crack propagation behavior of K40S cobaltbase superalloy at elevated temperature [J]. The Chinese Journal of Nonferrous Metals, Transactions of Nonferrous Metals S, 2003, 13(1): 50-54.

[9]王官龙.CPR1000反应堆堆内构件钴基合金堆焊的质量控制[J]. 金属加工:热加工，2018，(11）：24-26.

Wang G L. Quality control of cobaltbase superalloy surfacing of CRP1000 reactor internals [J]. MW Metal Forming, 2018, (11): 24-26.

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