Effects of cooling condition on microstructure and mechanical properties in laser rapid forming of 34CrNiMo6 thin-wall component. Issue 5 (February 2016)

• Record Type: Journal Article
• Authors: Chunping, Huang; Xin, Lin; Fencheng, Liu; Jun, Cao; Fenggang, Liu; Weidong, Huang
• Is Part Of: International journal of advanced manufacturing technology. Volume 82:Issue 5/8(2016)
• Page Start: 1269
• Page End: 1279
• Publication Date: 2016-02
• Subjects: Laser rapid forming -- Thin wall -- Cooling condition -- Microstructure -- Mechanical properties; Manufacturing processes -- Periodicals; Production engineering -- Periodicals; 670.427
• DOI: 10.1007/s00170-015-7453-z
• Languages: English
• ISSNs: 0268-3768

Abstract

Abstract Three kinds of cooling conditions, i.e., water cooling, metal cooling, and air cooling, were used to prepare 34CrNiMo6 steel thin-wall component by laser rapid forming (LRF) technology. The microstructure and mechanical properties of LRFed thin-wall component were investigated. Results indicate that 34CrNiMo6 steel thin-wall components without internal defect could be fabricated under three kinds of cooling conditions. Cooling condition has a significant effect on the microstructure and mechanical properties of LRFed thin-wall component due to the different tempering effects of subsequent LRFed process. The microstructure along the deposited direction is substantially uniform under the water-cooling condition, which consists of bainite and retained austenite. However, the microstructure of gradient structure changes from bainite to ferrite in thin walls produced under the metal-cooling and air-cooling conditions. The LRFed component under the metal-cooling condition has the best tensile property, of which the maximum tensile strength, yield ratio, and elongation reached to 993 MPa, 0.78, and 10.4 %, respectively. The LRFed component under the water-cooling condition is most brittle, and it is only 4 %. In contrast, the LRFed component under the air-cooling condition has the best plasticity.