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Influence of Quenching Temperature on Microstructure and Properties of 40Cr Steel by Zero Time Holding quenching A.M.Li a and M.J.Hu b School of Materials Science & Engineering,Henan Polytechnic University, Jiaozuo 454000, China aanmingli2001@sina.com, bhumengjuan05@126.com Keywords: 40Cr steel, Zero time holding quenched, Tensile strength, Hardness, Microstructure Abstract.
Experimental Material and Methods Experimental Material.
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Materials and Methods Materials.
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Experimental Materials and Instruments.
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Materials and method Materials The MSWI fly ash in the study was from Tianjin Teda MSW Incineration Plant.
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Materials and methods Study Site The study site is located in Tumenling Railway Forest Farm (44°06′N, 126°02′E), Jiutai, Changchun City, Jilin Province.
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Furthermore, it has higher damping capacity than other metal structure materials [1-2].
With the increase of the strain amplitude, the damping property of magnesium alloy increases faster than other materials.
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Numerous research have focused in this area, and novel findings have uncovered potential new materials for acoustic purposes.
These natural fibers are suitable substitutes for synthetic ones and wood-based materials for acoustic absorption purposes.
These designs utilized different sound-absorbent materials and concepts, such as porous, webbed, and Helmholtz resonators.
Conclusion Based on the studies, a semi-active design can work with a combination of sound-absorbing materials, such as porous materials and Helmholtz resonators.
Ismail, Acoustic properties of multi-layer coir fibers sound absorption panel, Journal of Applied Sciences. 8, 20 (2008) 3709-3714

All above of these provide the theoretical basis for further research of the cylinder mechanism, especially for the improvement of the structure and the subsequent optimization as well as the heat treatment of the materials.
Defining the Material Properties.
The material of roller is HT200; the material of the shaft and bearings is 45 steel and the other material properties are listed in table 1.
Table 1 Material properties Material attribute names Spindle and bearing set value Roller material set value density 7800 7200 modulus of elasticity 2.0×105 1.1×105 Poisson's ratio 0.3 0.28 Meshing.
The solid model can be meshed after defining the material properties.