热处理外文翻译---偏心轴的热处理及其力学性能的研究(编辑修改稿)

热处理外文翻译---偏心轴的热处理及其力学性能的研究(编辑修改稿)内容摘要：

and bear parts. This steel quenching temperature after tempering has good prehensive mechanical performance, lowtemperature impact toughness, and good temper brittleness not obvious. Swigging carburizing of grain has grown, so the requirements second tend to enhance the core quenched ductile, unfavorable cooling quenching. When is the fire HB170 ~ 217 hardness for when about 65 percent relative cutting machining, walkability medium, should be preheated before welding to 100 ~ 150 ℃ , cold deformation plasticity medium. Experiment: The heat treatment process in this experiment were as follows: installed furnace: the axis (cleaning) vertically into the basket mesh, large hole down, plug hole facing up gambling sales, in the installed furnace, put a pattern into the end of the eccentric shaft basket. Will be installed for the work piece material into the furnace basket hanging clothes time to close the lid, tighten the lid bolts, drops of methanol, the fans, transmission temperature, into the exhaust period. Open the vent whole pattern. Exhaust: ≤ 880 ℃ installed outside the pattern 2, the amount of methanol drops of 180200 drops / min。 880920 ℃ stop drops of methanol, the drops of kerosene, kerosene drop volume 180200 drops / min。 910 \ 920 ℃ , 30 minutes, the amount of kerosene drops of 180200 drops / min。 Close 30 minutes after the temperature pattern holes, Exhaust flame length of 80 ~ 150mm, into the carburizing period. carburization of 910 ~ 920 ℃ , 180 points, the amount of kerosene drops of 180200 drops / min。 water column 30 ~ 60mm. Diffusion Cooling: ≥ deep diffusion layer, it can spread into the cool, adjust the volume of kerosene drops of 100 to 140 drops / min, 10 to 30mm water column. released air. . Metallographic specimen preparation, according to the microstructure and hardness gradient measurements The preparation phase include microscopic pattern sampling, grinding, polishing, etching and other processes. Sampling pattern should be selected according to purpose of the study, whichever is representative of the site.... Grinding Cut in the grinding machine polished style, pointed to rounding. Then 180 ℃ , 240 ℃ , 300 ℃ and 600 ℃ grit polishing cloth, and back with 800 ℃ , 1500 ℃ progressively metallographic sandpaper grinding, grinding to 2020 ℃ has been rough sandpaper before polishing and fine polishing . Grinding style, each for a grinding step (. forOne sandpaper), the style should be turned 90 degrees the direction of grinding. It will show the wear scar is rubbed off. No abrasive cloth in each style (paper) on the grinding, the mill should be in one direction and avoid grinding back and forth, but to impose the appropriate force of style. Polishing The pattern needs to be polished finely ground. The purpose of polishing is to remove the legacy of fine grinding fine when worn to obtain bright mirror. Style is polished on the polishing machine specific, and speed like 100 ~ 150r/min. Polishing disk polishing spread when there are velvet and other fabrics, and continue to drip slurry. Polishing or Mg0 by Cr203 abrasive and a very finegrained water suspension formed, relying on the polishing slurry in the fine grinding powder and style that arise between the role of relative grinding and rolling to eliminate the wear scar. Polishing grinding style should be uniform so that pressure in the rotating polishing disc and the edge to the center along the disk constantly for radial reciprocating motion. Erosion The pattern has been polished before etching must be observed under the microscope. Erosion is mainly dependent on the metal etchant solution or electrochemical corrosion process, the surface of the metal pattern and the position of grain and grain boundary phases present between the slightly uneven, under the microscope can be clearly observed on the style surface, etching time should be appropriate, the general pattern can be grinding halt when dark. If lack of repeated erosion. After etching rinse immediately with water, then rinse with alcohol and finally dried with a hair dryer, pattern can be placed on the optical microscope observation. Organization and using optical microscope according to microstructure. Determination of the hardness gradient Micro Hardness Tester In recent years, micro hardness measuring the hardness of monly used equipment. Hardness is measured by reading down micro hardness. The focusing mechanism, measuring microscope, loading bodies, correct choice of load, speed automatic loading Unloading Test force control of test force and the proper time, the optical amplification by micro hardness, measured in a certain test .Force of diamond pyramid indenter pressed into the measured object left after the diagonal length of indentation, to find the hard object under test Degree of value. Chapter IV Experimental results and analysis The hardness of the experiment temperature Surface Filter layer Heart Ministry Room temperature 59〜 63HRC 36〜 42HRC 27〜 32HRC Surface hardness , the minimum hardness of heart the Ministry of the eccentric shaft has reached the performance requirements, and the Ministry of hardness from the surface to the heart decreases in line with the surface of high hardness, high wear resistance of the heart has good strength and toughness of the Department of requirements. The following figure is the hardness, the distance between the Ministry of centrifugation: Figure on the display and hard cover table further away, like centrifugal and hardness of the Ministry of the larger maximum hardness of the surface to meet the performance requirements of the eccentric shaft. Spacing is Metallographic analysis and discussion Through the above process and experimental results, w。