|
|
|
| Microstructural Evolution of a Hypoeutectoid Pearlite Steel under Rolling-sliding Contact Loading |
| Qiu-han LI,Chi ZHANG,Hu CHEN,Hao CHEN,Zhi-gang YANG |
| Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering,Tsinghua University, Beijing 100084, China |
|
|
|
|
Abstract To study the microstructural evolution of pearlite steel subjected to pure rolling and rolling-sliding contact loading, a hypoeutectoid pearlite steel with composition and microstructure similar to BS11 was designed and twin-disc tests of this pearlite steel were performed to simulate the wheel/rail system. After a series of twin-disc tests, optical microscope (OM) observation, scanning electron microscope (SEM) observation, X-ray diffraction (XRD), and micro-hardness tests were conducted to characterize the microstructure. Under the pure rolling contact condition, a large amount of reticular cracks emerged within 60 ��m below the contact surface of the samples after 120000 revolutions. The largest deformation was approximately 200 ��m below the contact surface. Under the rolling-sliding contact condition, the nodularization of pearlite within 100 ��m below the contact surface was obvious. The microstructure and stress-strain distribution of the area within 2 mm below the contact surface were investigated. The distribution of micro-hardness under the contact surface varied with contact conditions. Finite element method (FEM) was used to simulate the stress-strain distribution. The results of SEM, FEM, and micro-hardness tests indicated that under the pure rolling contact condition, the maximum plastic strain was approximately 200-400 ��m below the contact surface. Conversely, under the rolling-sliding contact condition, the maximum plastic strain emerged on the contact surface. Under the pure rolling contact condition, the distribution of micro-hardness was almost identical to that of the equivalent plastic strain. Under the rolling-sliding contact condition, the distribution of micro-hardness was affected by the equivalent plastic strain and tangential stress.
|
|
Received: 18 January 2016
Published: 18 October 2016
|
| Fund:This work was financially supported by National Basic Research Programs of China;This work was financially supported by National Basic Research Programs of China |
|
|
|
| [1] |
Zheng-wei GU,,Meng-meng L��,,Xin LI,,Hong XU,. Stretch Bending of Z-section Stainless Steel Profile[J]. Chinese Journal of Iron and Steel, 2016, 23(6): 525-530. |
| [2] |
Rong-sheng QI,Miao JIN,Xin-gang LIU,Bao-feng GUO. Formation Mechanism of Inclusion Defects in Large Forged Pieces[J]. Chinese Journal of Iron and Steel, 2016, 23(6): 531-538. |
| [3] |
Ji-jun FENG,,Chun-xu PAN,Liu-lin LU,Qi-wen HUANG,Hua-tang CAO. Plasma Transferred Arc Surface Alloying of Cr-Ni-Mo Powders on Compacted Graphite Iron[J]. Chinese Journal of Iron and Steel, 2016, 23(6): 618-624. |
| [4] |
Dian-tao ZHANG,,Zhen LI,,Yun-xiang TONG,,Yu-feng ZHENG,,Li LI,. New Formulas of Shear Strain during Equal-channel Angular Pressing Process with Consideration of Influences of Velocity and Motion Trajectory[J]. Chinese Journal of Iron and Steel, 2016, 23(10): 1020-1027. |
| [5] |
John Jairo CORONADO,Sara Aida RODR�kGUEZ. Cementite Characterization with Chromium and Vanadium Contents Using Indentation Technique[J]. Chinese Journal of Iron and Steel, 2015, 22(4): 366-370. |
| [6] |
Xu CHEN,Fu-bin LIU,Zhou-hua JIANG,Hua-bing LI,Xi-min ZANG,Xin DENG. Mathematical Modeling of ESR Process for Hollow Ingot with Current Supplying Mould[J]. Chinese Journal of Iron and Steel, 2015, 22(3): 192-199. |
|
|
|
|
2016, Vol. 23 
