Microstructure and properties of a novel wear- and corrosion-resistant stainless steel fabricated by laser melting depos
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ADDITIVE MANUFACTURING OF METALS: COMPLEX MICROSTRUCTURES AND ARCHITECTURE DESIGN
Microstructure and properties of a novel wear- and corrosion-resistant stainless steel fabricated by laser melting deposition Yurou Han1, Chunhua Zhang1, Xue Cui1, Song Zhang1,a), Jiang Chen2, Shiyun Dong3, Adil Othman Abdullah4 1
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, Liaoning 110870, People’s Republic of China Shenyang Dalu Laser Technology Co., Ltd., Shenyang, Liaoning 110136, People’s Republic of China National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China 4 Stomatology Research Center, School and Hospital of Stomatology, China Medical University, Shenyang, Liaoning 110002, People’s Republic of China a) Address all correspondence to this author. e-mail: [email protected] 2 3
Received: 16 January 2020; accepted: 9 March 2020
The study investigated novel wear and corrosion resistance of stainless steel and 316 stainless steel samples which were successfully prepared by laser melting deposition. Phase composition, microstructure, microhardness, wear resistance, and electrochemical corrosion resistance were studied. The experimental results showed that novel stainless steel was mainly composed of a-Fe and a few carbide phase (Cr, Fe)7C3. The microhardness of novel stainless steel was about 2.7 times greater than 316 stainless steel. Meanwhile, the specific wear rate of novel stainless steel and 316 stainless steel was 2.63 × 10−5 mm3/N m and 1.63 × 10−4 mm3/N m, respectively. The wear volume of 316 stainless steel was 6.19 times greater than novel stainless steel. The corrosion current and the corrosion potential of novel stainless steel and 316 stainless steel were 1.02 × 10−7 A/cm2 and 1.5 × 10−7 A/cm2, and −138.8 mV, −135.9 mV, respectively, in 3.5 wt% NaCl solution. Therefore, both microhardness and wear resistance of novel stainless steel were greatly improved, with high corrosion resistance.
Introduction Laser additive manufacturing (LAM) has been acknowledged as one of the most potential and excellent manufacturing technologies in the 21st century owing to its accurate controlled energy, high flexibility, and high automation [1]. In the past few decades, LAM has drawn extensive attention for the production of near-net–shaped components with high performance [2, 3]. During the LAM process, a small molten pool forms and solidifies quickly because of the fast movement of the laser beam. Using a sliced computer-aided design (CAD) file of LAM, components with complex shapes can be built layer by layer [4]. Laser melting deposition (LMD), one of the most essential branches of LAM techniques, is an excellent method for producing near-net-shaped dense metal components in a layer-by-layer mode by melting and solidification of prealloyed powders [5]. Compared with selective laser melting,
ª Materials Research Society 2020
which is another type of metal LAM technology with a prelaying powder process, LMD generates little materi
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