Microstructure and mechanical properties of laser solid formed 30Cr–Mn–Si–Ni–2A steel are investigated. The deposits consist of epitaxial columnar grains, equiaxed grains or direction changed dendrites can be observed in the bulk specimens. The microstructure at the bottom of deposits is mainly composed of tempered martensite; the middle to top zone of the deposits are characterised by martensite and bainite. With the increasing of deposition height, the volume fraction of bainite increases, the size of martensite laths increases but its volume fraction decreases. The microhardness shows a decrease from the bottom zone to the middle–upper zone, and then a significant increase at the top of the deposits. Anisotropic and unevenly distributed tensile properties are observed for the deposits. Samples after heat treatment demonstrate tensile strength of 1720 MPa and elongation rate of 8.7%.
MuhammadAH, AmeeqF.Microstructural, mechanical and tribological investigation of 30CrMnSiNi2A ultra-high strength steel under various tempering temperatures. Mater Res Express. 2018; 5:016505. doi: 10.1088/2053-1591/aa9fd3
2.
NiuQL, MingWW, ChenM, Dynamic mechanical behavior of ultra high strength steel 30CrMnSiNi2A at high strain rates and elevated temperatures. J Iron Steel Res Int. 2017; 24:724–729. doi: 10.1016/S1006-706X(17)30109-7
3.
NiuQL, LiPN, ChenM, Analysis of chip serration phenomenon in side milling of ultrahigh-strength steel 30CrMnSiNi2A. Int J Adv Manuf Technol. 2017; 88:985–993. doi: 10.1007/s00170-016-8832-9
4.
WangM, LinX, HuangWD.Laser additive manufacture of titanium alloys. Mater Technol. 2016; 31(2):90–97.
5.
FrazierWE.Metal additive manufacturing: a review. J Mater Eng Perform. 2014; 23:1917–1928. doi: 10.1007/s11665-014-0958-z
6.
GuDD, MeinersW, WissenbachK, Laser additive manufacturing of metallic components: materials, processes and mechanisms. Int Mater Rev. 2012; 57(3):133–164. doi: 10.1179/1743280411Y.0000000014
7.
ThompsonSM, BianLK, ShamsaeiN, An overview of direct laser deposition for additive manufacturing; part I: transport phenomena, modeling and diagnostics. Addit Manuf. 2015; 8:36–62. doi: 10.1016/j.addma.2015.07.001
8.
ShamsaeiN, YadollahiA, BianLK, An overview of direct laser deposition for additive manufacturing; part II: mechanical behavior, process parameter optimization and control. Addit Manuf. 2015; 8:12–35. doi: 10.1016/j.addma.2015.07.002
9.
SunGF, ZhouR, LuJZ, Evaluation of defect density, microstructure, residual stress, elastic modulus, hardness and strength of laser-deposited AISI 4340 steel. Acta Mater. 2015; 84:172–189. doi: 10.1016/j.actamat.2014.09.028
10.
ChewaYX, PangJHL, BiGJ, Effects of laser cladding on fatigue performance of AISI 4340 steel in the as-clad and machine treated conditions. J Mater Process Tech. 2017; 243:246–257. doi: 10.1016/j.jmatprotec.2016.12.020
11.
RanXZ, LiuD, LiA, Microstructure characterization and mechanical behavior of laser additive manufactured ultrahigh-strength AerMet100 steel. Mat Sci Eng A Struct. 2016; 663:69–77. doi: 10.1016/j.msea.2016.03.051
12.
RanXZ, LiuD, LiJ, Effects of post homogeneity heat treatment processes on microstructure evolution behavior and tensile mechanical properties of laser additive manufactured ultrahigh-strength AerMet100 steel. Mat Sci Eng A Struct. 2018; 723:8–21. doi: 10.1016/j.msea.2018.02.090
13.
LiuFG, LinX, SongMH, Microstructure and mechanical properties of laser solid formed 300M steel. J Alloy Compd. 2015; 621:35–41. doi: 10.1016/j.jallcom.2014.09.111
14.
LiuFG, LinX, SongMH, Effect of tempering temperature on microstructure and mechanical properties of laser solid formed 300M steel. J Alloy Compd. 2016; 689:225–232. doi: 10.1016/j.jallcom.2016.07.276
15.
LiuFG, LinX, YangHO, Effect of microstructure on the fatigue crack growth behavior of laser solid formed 300M steel. Mat Sci Eng A. 2017; 695:258–264. doi: 10.1016/j.msea.2017.04.001
16.
ZhanXH, LinX, GaoZN, Modeling and simulation of the columnar-to-equiaxed transition during laser melting deposition of Invar alloy. J Alloy Compd. 2018; 755:123–134. doi: 10.1016/j.jallcom.2018.04.313
17.
WangJ, LinX, WangJT, Grain morphology evolution and texture characterization of wire and arc additive manufactured Ti-6Al-4V. J Alloy Compd. 2016; 689:225–232. doi: 10.1016/j.jallcom.2016.04.231
18.
BonthaS, KlingbeilNW, KobrynPA, Thermal process maps for predicting solidification microstructure in laser fabrication of thin-wall structures. J Mater Process Technol. 2006; 178:135–142. doi: 10.1016/j.jmatprotec.2006.03.155
19.
SegerstarkA, AnderssonJ, SvenssonLE.Evaluation of a temperature measurement method developed for laser metal deposition. Sci Technol Weld Joi. 2017; 1(1):1–6. doi: 10.1080/13621718.2016.1169363
20.
GriffithML, SchliengerME, HarwellLD, Understanding thermal behaviour in the LENS process. Mater Design. 1998; 20:107–113. doi: 10.1016/S0261-3069(99)00016-3
