Effects of temperature on the friction-wear properties of 40Cr steel by warm extrusion
-
摘要: 采用溫擠壓技術對40Cr鋼進行成形試驗，考察了不同溫度下溫擠壓試樣的摩擦-磨損行為.通過掃描電鏡、能譜儀和X射線衍射儀分析了40Cr鋼磨損后表面形貌、化學元素分布和物相組成，討論了40Cr鋼溫擠壓的磨損機理.結果表明，在擠壓溫度為550℃時試樣晶粒尺寸細小，殘余奧氏體含量較高，硬度最高，其磨損性能為最佳；而當溫度為650℃和750℃時，晶粒尺寸較粗大，殘余奧氏體含量降低.在5N載荷作用下，擠壓溫度為550℃時，摩擦因數為0.7667；當擠壓溫度達到650℃，摩擦因數為0.8587，提高了12.01%，磨損性能降低；750℃時，摩擦因數為0.8764，相比550℃提高了14.31%，磨損性能進一步變差；在550、650和750℃時，磨損形式主要為磨粒磨損.Abstract: A forming experiment of 40Cr steel was conducted by using a warm extrusion technology, and the friction-wear behavior of the samples at different extrusion temperatures were observed. The wear morphologies, distributions of chemical elements and phase compositions were analyzed by scanning electronic microscopy (SEM), energy diffusive spectrometry (EDS), and X-ray diffraction (XRD), respectively, and the wear mechanism of warm extrusion on 40Cr steel was discussed. The results show that the grains are samll by warm extrusion at 550℃, the content of retained austenite is higher, and the hardness is the highest, showing that the wear resistance is the best. The size of grains is bigger and the contents of retained austenite decrease at the extrusion temperature of 650℃ and 750℃. The coefficient of friction is 0.7667 at the extrusion temperature of 550℃ under the load of 5 N, while that is 0.8587 at the extrusion temperatures of 650℃, which increases by 12.01%, and the wear performance decreases. At the extrusion temperature of 750℃, the coefficient of friction is 0.8764, which increases by 14.31% compared with 550℃, and the wear performance is worse. The wear forms of the samples at 550, 650 and 750℃ are common abrasive wear.
-
Key words:
- warm extrusion /
- alloy steel /
- extrusion temperature /
- wear performance
-
參考文獻
[3] Wu A Q, Liu Q B, Qin S J. Influence of yttrium on laser surface alloying organization of 40Cr steel. J Rare Earths, 2011, 29(10):1004 [4] Dong H G, Yu L Z, Deng D W, et al. Effect of post-weld heat treatment on properties of friction welded joint between TC4 titanium alloy and 40Cr steel rods.J Mater Sci Technol, 2015, 31(9):962 [5] Ge Y C, Yi M Z, Li L Y. Influence of load on sliding tribology of C/C composite with 40Cr steel couple coated by Cr.Trans Nonferrous Met Soc China, 2007, 17(3):570 [6] Dong H G, Yu L Z, Gao H M, et al. Microstructure and mechanical properties of friction welds between TiAl alloy and 40Cr steel rods.Trans Nonferrous Met Soc China, 2014, 24(10):3126 [7] Li Y F, Pan X D, Wang G L. Low cycle fatigue and ratcheting properties of steel 40Cr under stress controlled tests.Int J Fatigue, 2013, 55:74 [12] Wang J Q, Dong P, Hou W L, et al. Synthesis of Al-rich bulk metallic glass composites by warm extrusion of gas atomized powders. J Alloys Compd, 2013, 554:419 [13] Onawola O O, Adeyemi M B. Warm compression and extrusion tests of aluminums.J Mater Process Technol, 2003, 136(1-3):7 [14] Eghbali B, Shaban M. Warm deformation of low carbon steel using forward extrusion-equal channel angular pressing technique.J Iron Steel Res Int, 2013, 20(2):68 [15] Hun H J. A three-dimensional finite element simulation of the warm extrusion of AZ31 alloy billets.J Manuf Processes, 2010, 12(2):67 [16] Han Y, Wen H Y, Yu E L. Study on electromagnetic heating process of heavy-duty sprockets with circular coils and profile coils.Appl Therm Eng, 2016, 100:861 -
點擊查看大圖
計量
- 文章訪問數: 657
- HTML全文瀏覽量: 278
- PDF下載量: 16
- 被引次數: 0
下載:
