Interfacial Structure and Interface Hardness and Elastic Modulus Distribution in Laser Clad TiC_pNi Alloy Coatings

Interface Structure and Interface Hardness and Elastic Modulus Distribution in Laser Clad TiCpNi Alloy Coatings Wu Xiaolei Hong Youshi National Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences. Beijing 100080 to 10 epitaxial growth and 03. Phase The nanohardness tester was used to investigate the interface hardness and the distribution of elastic modulus between the 13 and the substrate. Add 101; The curve loaded with the interface of the matrix has the phenomenon of displacement and sudden entrance; the curve of the loading near the interface of in situ 1 does not have the phenomenon of 13,1. In situ near the 101 phase interface, and; showed a continuous gradient distribution characteristics, Ming Ding interface with high stiffness and toughness.

Chinese and French classification D.03.25, D. 03.12 laser cladding ceramic particle reinforced composite coatings can significantly improve the wear resistance.

Cladding ceramic particles can be directly added to the molten pool 4 can also be in-situ reaction in the molten pool to form 156 particles can present a macroscopic uniform distribution 3! Or gradient distribution characteristics 461. The phase interface between the reinforcement and the substrate has a dual role, that is, the stress is transmitted to the reinforcement through shear and the crack is deflected and absorbs energy. The study of crack initiation and propagation at the clear interface is the main method of coating wear failure. Although the micro-analysis method can be used to directly observe the microstructure features of the phase interface, the National Natural Science Foundation of China's National Foundation for the Interface Mechanics 19704100 and the Chinese Academy of Sciences received a preliminary draft date of 19990820, and received the revised draft date of 199929. Research weaknesses. A nanometer hardness tester that can test the mechanical properties of micro-zones has been applied in thin-film coating nanomaterials and fiber-reinforced composites. Hardness Elastic Modulus Strain Rate Sensitivity Creep Properties and Friction and Other Mechanical Properties Testing 78 Used for Coatings The study of the mechanical behavior of the phase interface has not been reported in the literature. In this paper, the distribution characteristics of interface toughness, hardness and elastic modulus of alloy 1 in laser-coated coatings were studied using nano-hardness tester.

1 Experimental method The D 15 alloy coating was prepared by laser cladding. The 1 and Yang alloy powders were pre-coated on the sample layer. The thickness of the coating was 0.8 mm. The TiC 1 particle size was obviously different. The scale was too small to be 30. Its structure. However, it was clearly observed that the dislocation structure of the precipitates was observed at least in Dingmao and Nichimachi. The in-situ 1 surface has no reactants and no crystalline phase. 5,61 This is the D. mad 10. The analysis results show that the chemical composition of the alloy elements is broken at the near interface and away from the interface region of the undissolved and in-situ D1. big change. And there is a 33 which is caused by incomplete dissolution of corpse 1 or incomplete reaction of 7 and 0. ! The in-situ distribution of dan and its distribution in the interface region of the substrate was about 4 and 0, 5 and the indentation and interface distances were 147 and 94 respectively. The focus was on the 7 and ugly distributions in the near-interface region. A smaller depth of press-in displacement is set. The corresponding indentation scale is small, and the distance between the indentation and the interface. so close. The loading and unloading curves in the meal tray 415 have non-linear characteristics, but the proportion of the elastic recovery at the time of unloading is different. The alloys that are called alloys have undergone plastic deformation. It is worth noting that head 1 corresponds to a displacement of several nanometers, 1 individual to more than a dozen nanometers, 1 coating of 31 morphologies as 44 and a volume fraction of 30. Alloy composition mass fraction, mesh. Substrate is quenched and tempered 50,4, steel, sample size 20, parent 20 leg parent 6,1. Using 3 1 boundary continuous 002 laser cladding parameters power 2.5kW, scanning speed 15mmS, spot diameter 2. Mmt, gas protection weld pool. Simultaneously. An in-situ reinforced coating was prepared using a calender cladding, the pre-smooth alloy powder was D, and the alloy. 1 formed by in-situ reaction of 1 and C in a molten bath. Cladding parameters of power 2kW, scanning speed 15, spot diameter of 3, electron microscopy and high-resolution electron microscopy observation of the Ming-yin scale is sub-micron. The phase interface has no reactants and precipitates.

The electrons were observed at the input of 7æ›°1 and 0, and the chemical composition of the interface structure near the interface was observed. The 1 nm hardness tester was used to measure the elasticity, hardness, and hardness of the substrate near the interface between 0 and the substrate. The indenter is still silver, and the instrument continuously records the load displacement curve during loading and unloading. Analyze and output hardness and Zen modulus results by computer. The conditions are determined by the following equations: 80, 8 and 1 respectively, for the diamond indenter material and the material, and the diamond torsion material are respectively 8 and 0.07; yttrium is compound and linearly fit for the start of the unloading curve. Get the slope. For contact depth. It is a dimensionless constant.

2 Experimental results and discussion 1 The surface structure features of 4 trapped 13 and in situ 4 were uniformly distributed. But in situ has sub-meters and meters.

1 There is a very thin ring phase at the interface with the substrate. Under the bright field condition, the contrast between the contrast and Ding Xiangyu was observed in the dark field image of the thin layered material and D.

It also has the same contrast degree 2. The clear and thin layered material is a small element that has been re-precipitated by an epitaxial mechanism at the time of rapid set-up after partial dissolution of the original surface. Ding 5 can be partially dissolved in the laser feeding process, dissolved or partially dissolved in the matrix or re-epitaxially crystallized on the grain surface. Progress can also be observed. There is an arrow of the granular crystal phase 21 at the interface of the Outer Chamber 1, and the crystal phase can also be connected in a shell shape. The electron diffraction analysis of the selected area showed that the crystalline phase was 3, and the compounds 3, 2, and 3 were respectively 30 and 30. In the range of large fast hunting speeds depending on the scanning speed of the laser, all were observed, and the phase preferentially appeared in the Ding Noodle. Nucleation growth phenomenon.

2 Ding 4, 1 phenomenon of insoluble phase surface microstructure.

The distribution characteristics of the core and dan around the Zhidan 5 for the 5 in the undissolved near-interface region, and Dan this is 231.4 and 8 respectively. Compared with the substrate, the near-interface region has only a small increase in ugliness, and 1 itself. About 450, and ugly about 320, there is a great difference, while in the far away from the interface area and where the inhibition of alloys in the near interface area 5, and 5, the maximum were 320.8 and 14,10, have increased. At the same time, smooth continuous gradient changes were observed throughout the entire area. The above results show that there are significant differences and distribution characteristics between the two formation methods and the different scales of the D-interface. 3 It is clear that during the loading process, micro-cracks may form in the interface region or local separation from the matrix occurs. The nanohardness of the film and nanoparticle materials was measured. It can be inferred that micro-crack initiation occurred at the mouth, corresponding to the smaller displacement. The larger displacement will change the pre-elastic deformation to plastic deformation.

Therefore, the magnitude of the corresponding load reflects the arrival of the interface in the plastic deformation process. For the depth of the library, add D1 to the test. The curve of the loading curve near the interface region exists, and the phenomenon of the laser rapid condensation condition and the chemical composition of the region in the surface area is not different. However, it was not observed in the in-situ interface loading curve. 1 The ability to resist microcracks initiation. Addition of D5 interface is easy to form interface reaction. Therefore, the loading curve shows that the interface resists the brittleness of microcracks and the segregation of alloying elements, and the toughness characteristics of the interface are easily initiated by initiation of crack initiation at the interface. In situ D3 interface has higher toughness. The literature has led to the appearance of low-stress damage, which may be the main origin of the phenomenon of the mouth, the analysis of the mechanical properties of the particle reinforced composite material, that the grain refinement can significantly improve the matrix and ugly. The near interface region and the ugly distribution are mainly related to the grain size. The in-situ D-1 scale is sub-micron, and it is well integrated with the matrix interface, which contributes greatly to the matrix strength and stiffness. Therefore, the in-situ alloyed matrix interface has a higher stiffness and toughness than that of the undissolved alloy 3 .

3 Conclusions There is an interfacial crystal phase at the interface in the 1 alloy coating formed by the addition of 1.

The loading curve of the applied near-interface region exists and the phenomenon is that the hardness of the interface near the interface region of the substrate is lower and the elastic modulus is lower; the loading curve of the near-interface region of in-situ 1 has no 1-ratio phenomenon, and the HR is higher and shows a continuous gradient distribution characteristic. .

In situ D 1 interface has high stiffness and toughness.

Wu Ping, Zhou Changzhi, Southwestern Tang Dynasty. Chinese Journal of Metals, 1994; 30508 Wu Xiaolei, Chen Guangnan. Chinese Journal of Metals, 18;341284