Direct Friction Welding of TiAl Alloy to 42CrMo Steel Rods

Dong, Honggang; Yu, Lianzhen; Deng, Dewei; Zhou, Wenlong; Chen, Dong

doi:10.1080/10426914.2014.973576

Cited by 19 publications

(5 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…42CrMo4 and 38MnVS6 are medium carbon steels with high carbon content, which means the weld will have high hardening tendency and high crack sensitivity. The connection of 42CrMo4 and 438MnVS6 has been considered by welding researchers [5][6][7]. There are two problems with the welding of medium carbon steel that need to be solved.…”

Section: Introductionmentioning

confidence: 99%

Effect of Preheating Temperature on Microstructure and Properties of 42CrMo4/38MnVS6 Heterogeneous Laser Welded Joint

Qiu

Xing

et al. 2019

Metals

View full text Add to dashboard Cite

Laser-welded forged steel pistons can meet the needs of the new era of heavy truck engines. 42CrMo4 and 38MnVS6 are widely used as piston materials due to the good mechanical properties. This study investigates the influence of preheating on microstructure and mechanical properties of 42CrMo4/38MnVS6 laser welding joint. The experimental results show preheating increases the laser absorption capacity of the metal, which can lead to an increase in weld width. The microstructure of weld is the high-hardness and poor toughness twin martensite without preheating. As the temperature of preheating increases, the twin martensite in the weld begins to transform into lath martensite and regenerates ferrite and bainite. As the preheating temperature increases, the plane fracture toughness (K1C) of the weld increases and then decreases, reaching the highest value of 2322.94 MPa·mm −1/2 at 150 • C. Compared with no preheating conditions, the tensile strength of the welded joint after preheating is improved. The fracture mode of welded joints changes from brittle fracture to ductile fracture. When the preheating temperature is 100-200 • C, the tensile strength of the welded joint reaches 1018.1-1032.5 MPa; when the preheating temperature is 250 • C-300 • C, the tensile strength decreases. the heat input is in the range of 275 J/mm 0.5 ·s 0.5 to 435 J/mm 0.5 ·s 0.5 , and there was no defect in the weld [12]. Kuryntsev et al. studied the effect of heat treatment on laser welded joints of 0.349C-1Cr-1Si steel. The results showed that the laser welded joint had the characteristics of high hardness and low elongation. After heat treatment, the elongation and ductility of the welded joint are improved [13]. Laser welding has a high energy density, and the base metal is not easy to deform after welding. It can optimize the piston structure and is conducive to the full combustion of fuel. Therefore, the development of laser welding forged steel piston has become one of the development directions of piston structure [14][15][16][17]. Preheating before welding can increase the laser absorption rate of the metal and reduce the cooling rate of the weld, adjust the stress distribution of the welded joint, avoid the generation of hardened structure in the weld, and is one of the welding methods to effectively improve the mechanical properties of the welded joint [18,19].At present, there are more studies on laser welding of aluminum alloy and low carbon steel with preheating, but less on medium carbon steel [20][21][22]. In this paper, the effect of preheating on the weld structure of 42CrMo4/38MnVS6 laser welding is studied, and the mechanical properties of welded joints under different preheating temperature are compared and analyzed, which provides the basis of experimental and theoretical for the application of laser welding technology in a forged steel piston. Materials and Methods Materials

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Preheating Temperature on Microstructure and Properties of 42CrMo4/38MnVS6 Heterogeneous Laser Welded Joint

Qiu

Xing

et al. 2019

Metals

View full text Add to dashboard Cite

show abstract

“…Ding J. et al [ 14 ] proposed the direct joining of γ-TiAl turbocharger (Ti-46Al-2Cr-2Nb at %) to a 40Cr steel shaft (Fe-0.4C-1Cr-0.7Mn-0.3Si wt %) with Electron Beam Welding (EBW), trying to obtain a sound joint by modifying the welding parameters, such as heat input. Dong H. et al [ 15 ] studied the joining of γ-TiAl alloy (Ti-43Al-2Cr-Zr-Fe at %) to 42CrMo steel (Fe-0.43C-1.09Cr-0.67Mn-0.31Si-0.2Mo wt %) through direct friction welding, examining the mechanical properties and the obtained microstructure. On the other hand, brazing of TiAl is more difficult than that of common metallic materials, because of its reactivity, which can cause the formation of secondary phases.…”

Section: Introductionmentioning

confidence: 99%

Characterization of an Additive Manufactured TiAl Alloy—Steel Joint Produced by Electron Beam Welding

et al. 2018

View full text Add to dashboard Cite

In this work, the characterization of the assembly of a steel shaft into a γ-TiAl part for turbocharger application, obtained using Electron Beam Welding (EBW) technology with a Ni-based filler, was carried out. The Ti-48Al-2Nb-0.7Cr-0.3Si (at %) alloy part was produced by Electron Beam Melting (EBM). This additive manufacturing technology allows the production of a lightweight part with complex shapes. The replacement of Nickel-based superalloys with TiAl alloys in turbocharger automotive applications will lead to an improvement of the engine performance and a substantial reduction in fuel consumption and emission. The welding process allows a promising joint to be obtained, not affecting the TiAl microstructure. Nevertheless, it causes the formation of diffusive layers between the Ni-based filler and both steel and TiAl, with the latter side being characterized by a very complex microstructure, which was fully characterized in this paper by means of Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy, and nanoindentation. The diffusive interface has a thickness of about 6 µm, and it is composed of several layers. Specifically, from the TiAl alloy side, we find a layer of Ti3Al followed by Al3NiTi2 and AlNi2Ti. Subsequently Ni becomes more predominant, with a first layer characterized by abundant carbide/boride precipitation, and a second layer characterized by Si-enrichment. Then, the chemical composition of the Ni-based filler is gradually reached.

show abstract

“…Dong et al (2015) had reported that in friction welding of TiAl alloy to 40Cr steels, there was an agglomeration of C at the weld interface due to the formation of TiC. After post-weld heat treatment (PWHT), the agglomeration of C disappeared and the strength of the joint increased accordingly.…”

Section: Introductionmentioning

confidence: 99%

Effect of post-weld heat treatment on friction welded joint of carbon steel to stainless steel

Qin

Geng

et al. 2016

Journal of Materials Processing Technology

View full text Add to dashboard Cite

Direct Friction Welding of TiAl Alloy to 42CrMo Steel Rods

Cited by 19 publications

References 18 publications

Effect of Preheating Temperature on Microstructure and Properties of 42CrMo4/38MnVS6 Heterogeneous Laser Welded Joint

Effect of Preheating Temperature on Microstructure and Properties of 42CrMo4/38MnVS6 Heterogeneous Laser Welded Joint

Characterization of an Additive Manufactured TiAl Alloy—Steel Joint Produced by Electron Beam Welding

Effect of post-weld heat treatment on friction welded joint of carbon steel to stainless steel

Contact Info

Product

Resources

About