US 12,246,381 B2
Method for prefabricating air hole defect by means of controlled SLM process
Liming Lei, Shanghai (CN); Yali Li, Shanghai (CN); Yanli He, Shanghai (CN); Xiaohui Chen, Shanghai (CN); and Jun Fu, Shanghai (CN)
Assigned to AECC SHANGHAI COMMERCIAL AIRCRAFT ENGINE MANUFACTURING CO., LTD., Shanghai (CN); and AECC COMMERCIAL AIRCRAFT ENGINE CO., LTD, Shanghai (CN)
Appl. No. 17/920,545
Filed by AECC SHANGHAI COMMERCIAL AIRCRAFT ENGINE MANUFACTURING CO., LTD., Shanghai (CN); and AECC COMMERCIAL AIRCRAFT ENGINE CO., LTD., Shanghai (CN)
PCT Filed Dec. 21, 2020, PCT No. PCT/CN2020/137881
§ 371(c)(1), (2) Date Oct. 21, 2022,
PCT Pub. No. WO2021/212887, PCT Pub. Date Oct. 28, 2021.
Claims priority of application No. 202010319637.2 (CN), filed on Apr. 22, 2020.
Prior Publication US 2023/0141551 A1, May 11, 2023
Int. Cl. B22F 10/28 (2021.01); B22F 10/366 (2021.01); B22F 10/38 (2021.01); B33Y 10/00 (2015.01); B33Y 50/02 (2015.01)
CPC B22F 10/28 (2021.01) [B22F 10/366 (2021.01); B22F 10/38 (2021.01); B33Y 10/00 (2014.12); B33Y 50/02 (2014.12)] 6 Claims
OG exemplary drawing
 
1. A method for controlling an SLM process to prefabricate pore defects, the method comprising:
laser scanning a specified metal melt layer according to a first scan path; and
laser scanning the specified metal melt layer according to a second scan path,
wherein the first scan path and the second scan path have a path overlap zone, the path overlap zone has a predetermined width, and laser energy input superimposed in the path overlap zone is controlled to reach a predetermined energy value, whereby keyholes are formed at a plurality of positions in a lengthwise direction of the path overlap zone, the specified metal melt layer is taken as a defect layer, and the keyholes in the path overlap zone is taken as pore defects,
wherein laser scanning along the first and second scan paths are each performed in a strip-type pattern using a pulse exposure mode,
wherein the first scan path is located in a first strip zone, the second scan path is located in a second strip zone, the first strip zone and the second strip zone form a strip lap-joint zone, the strip lap-joint zone constitutes the path overlap zone, and a strip lap-joint amount of the strip lap-joint zone is a width of the path overlap zone, and
wherein parameters of the SLM process are controlled such that a Nickel-Chromium-Iron-Molybdenum alloy is used as a shaping material; a laser scan power P is set between 180 W and 210 W, inclusive; a scan line dot spacing D is set between 80 μm and 100 μm, inclusive; and a scan line exposure time t is set between 70 μs and 90 μs, inclusive.