High-strength stainless steel powder based on SLM technology and preparation method thereof
A high-strength, stainless steel technology, applied in metal processing equipment, additive processing, transportation and packaging, etc., can solve problems such as material selection bottlenecks, achieve good sphericity, reduce costs, and increase the yield of fine powder
Active Publication Date: 2018-09-11
CENT IRON & STEEL RES INST
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[0003] The purpose of the present invention is to provide a high-strength stainless steel powder based on the SLM process and its preparation method. Through the alloy composition, smelting method and matching powder-making process design, a high-strength stainless steel metal powder based on the SLM process is manufactured. Solve the domestic SLM additive manufacturing field, especially the material selection bottleneck of high-strength metal powder consumables
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[0025] The embodiment of the present invention is three kinds of high-strength stainless steel metal powders with different yttrium content, and its chemical composition is shown in Table 1. Its preparation method is as follows: (1) Master alloy preparation: the embodiment all adopts vacuum induction furnace+vacuum consumable furnace double-joint smelting process to prepare master alloy, and its master alloy chemical composition is C: 0.028%, Si: 0.066%, Mn: 0.006%, P: 0.0045%, S: 0.0008%, Cr: 12.52%, Ni: 8.54%, Mo: 2.30%, Al: 1.14%, O: 0.0022%, and the balance is Fe and unavoidable impurities. (2) VIGA powder making: Put the master alloy into the VIGA melting crucible and vacuumize it. When the pressure drops below 0.1Pa, fill it with high-purity argon gas above 99.999% until the pressure is restored (repeat three times). Conduct induction heating, heating temperature to 1600-1680°C, after the master alloy is completely melted, add metal yttrium with different content, keep w...
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The invention discloses high-strength stainless steel powder based on an SLM technology and a preparation method of the powder, and belongs to the field of metal materials for additive manufacturing.The powder is prepared from, by weight, less than 0.03% of C, 12.0-13.0% of Cr, 8.0-10.0% of Ni, 2.0-2.5% of Mo, 0.8-1.2% of Al, 0.02-0.10% of Y, less than 0.1% of Si, less than 0.01% of Mn, less than0.005% of P, less than 0.002% of S, less than 0.020% of O and the balance Fe and inevitable impurities. The manufacturing technology comprises master alloy preparation, powder preparation through a vacuum induction melting gas atomization method, and mechanical vibration and airflow classified powder screening and collection under inert gas protection. The high-strength stainless steel powder hasthe advantages that compared with the prior art, the yield of fine powder within the particle range being 15-35 micrometers requested by the SLM technology is remarkably improved, the powder is low in degree of sphericity and low in oxygen and impurity content, can be used as powder consumable for high-strength complex precision components for SLM printing in the field of space flight engineeringand can also be popularized in the relative fields of medical treatment, ocean engineering and the like.
Description
technical field [0001] The invention belongs to the field of metal materials for additive manufacturing, and in particular provides a high-strength stainless steel powder based on an SLM process and a preparation method thereof. Background technique [0002] Additive manufacturing (3D printing) has technical advantages such as not being restricted by the complexity of parts, high material utilization rate and significantly shortening the development cycle, and has become one of the most potential manufacturing technologies in the future. At present, metal additive manufacturing technologies mainly include selective laser melting technology (SLM), laser net shaping technology (LENS), and electron beam melting technology (EBM). Among them, because the parts printed by SLM technology have the advantages of complex structure and high dimensional accuracy, they are widely used in the fields of aerospace and medical equipment with precision and complex parts, which is also the mos...
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Login to View More IPC IPC(8): C22C38/44C22C38/06C22C38/02C22C38/04B22F1/00B22F9/08B33Y70/00
CPCC22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/44B22F9/082B33Y70/00B22F2009/0848B22F1/065
Inventor 梁剑雄王长军刘振宝杨志勇孙永庆李文辉曹呈祥雍兮胡家齐张梦醒
Owner CENT IRON & STEEL RES INST