Cr含量对激光增材制造12CrNi2合金钢的组织结构的影响  

Effect of Cr-Content on Microstructure of 12CrNi2 Alloy Steel Prepared by Laser Additive Manufacturing

作　　者：董志宏[1] 亢红伟 谢玉江[1] 迟长泰 彭晓 DONG Zhihong;KANG Hongwei;XIE Yujiang;CHI Changtai;PENG Xiao(Laboratory for Corrosion and Protection,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;College of Material Science and Engineering,University of Science and Technology of China,Hefei 230026,China;School of Materials Science ahd Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]中国科学院金属研究所金属腐蚀与防护实验室,沈阳110016 [2]中国科学技术大学材料科学与工程学院,合肥230026 [3]南昌航空大学材料科学与工程学院,南昌330063

出　　处：《材料研究学报》2018年第11期827-833,共7页Chinese Journal of Materials Research

基　　金：国家重点研发计划(2016YFB1100203)~~

摘　　要：对商用12CrNi2合金钢粉末进行激光增材制造时发现,在沉积态合金钢内部产生了大量的孔洞。这种孔洞的形成,主要与溶池中的O与C反应生成的气泡有关。合金钢粉末中增加Cr量后,它因与O亲和力大而在溶池中优先"捕捉"O析出Cr_2O_3,有效地抑制了成形合金钢中孔洞的形成;Cr_2O_3的析出使成形合金钢铁素体和奥氏体的组织细化,提高了合金钢的显微硬度。12CrNi2 alloy steel has been prepared by means of laser additive manufacturing(LAM)using a commercial alloy steel powder. The results show that the LAMed alloy steel contains a large number of pores intrinsically associated with the reaction of O and C, which form gases in molten pool of the laser melting alloy steel powder. The pore formation can be highly suppressed by adding into the steel powder with small amounts of Cr, because it preferentially reacts with O to form Cr2O3 and consequently prevents the gases formation in the molten pool. The Cr2O3 formation also refines the ferrite and the austenite phases of the LAMed alloy steel and increases its hardness.

关 键 词：金属材料 组织结构 激光增材制造 CR含量 合金钢 

分 类 号：TG142.1[一般工业技术—材料科学与工程]