|
|
|
| Inclusion control and fatigue performance in high performance GCr15 bearing steel |
| CHE Xiao-jian1,2，YANG Mao-sheng2，TANG Hai-yan1，LI Jian-xin3， PANG Xue-dong3，SUN Yong3 |
（1. School of Metallurgical and Ecological Engineering， University of Science and Technology Beijing， Beijing 100083， China
2. Institute for Special Steels， Central Iron and Steel Research Institute， Beijing 100081， China
3. Technology Center， Fushun Special Steel Co.， Ltd.， Fushun 113000， Liaoning， China） |
|
|
|
|
Abstract The smelting process of GCr15 bearing steel has a significant effect on the fatigue properties. Distribution of oxygen，nitrogen，sulfur and nonmetallic inclusions in steel as well as influence rule of fatigue performance were made on smelting process of LF＋VD，electroslag remelting （ESR） and induction melting/consumable in vacuum （VIM＋VAR） to produce GCr15 Bearing steel. The results show that oxygen and nitrogen mass percent of VIM＋VAR smelting process is respectively 0.000 5% and 0.001 6%，The total number of inclusions is only 1.54 per mm2；Oxygen and nitrogen mass percent of ESR smelting process is respectively 0.001 8% and 0.011 0%. The total number of inclusions is 17.78 per mm2. Inclusion is no larger than the 13 μm；Sulfur mass percent of LF＋VD smelting process is 0.002 6%. The mass ratio of sulfur to oxygen in the steel is 3.7.The total number of inclusions is 20.73 per mm2. The ratio of CaS and complex inclusion of CaS and oxide in steel is higher. Rotational bending fatigue test results show that the safety fatigue limits of LF＋VD，ESR and VIM＋VAR are respectively 980，1 164 and 1 158 MPa. The type of inclusions that cause fatigue damage is related to the preparation process. Inclusion type of LF＋VD are CaS，CaS（Oxide） and CaO·Al2O3. Inclusion type of ESR are Al2O3 and CaO·Al2O3. Inclusion type of VIM＋VAR are TiN，MgO·Al2O3 and CaS（Oxide）. According to the real stress factors and fatigue life，the degree of damage to the inclusions in steel from large to small are TiN，CaO·Al2O3，MgO·Al2O3，Al2O3，CaS（Oxide） and CaS. The difference of the type and size of the fatigue source leads to the difference in the safety fatigue limit of the GCr15 bearing steel.
|
|
Received: 29 September 2017
Published: 11 May 2018
|
|
|
|
| [1] |
HOU Xin-mei, LIU Yun-song, WANG En-hui. Effect of ladle-lining refractory on non-metallic inclusions in steel[J]. Iron and Steel, 2020, 55(6): 15-24. |
| [2] |
NIU Kai-jun, YANG Wen, ZHANG Li-feng, CHU Yan-ping, ZHANG Hong-qi, GUO Zi-qiang. Thermodynamics and industrial practice of formation of inclusions during solidification of tire cord steels[J]. Iron and Steel, 2020, 55(6): 61-67. |
| [3] |
ZHAO Zhong-yu, ZHAO Jun-xue, TAN Ze-xin, LU Liang, CUI Ya-ru, LI Xiao-ming. Determination and analysis of CaF2-Al2O3 binary phase diagram based on volatilization effect[J]. Iron and Steel, 2020, 55(4): 34-39. |
| [4] |
CHU Yan-ping, CHEN Zhi-yong, LIU Nan, ZHANG Li-feng. Formation and control of spinel inclusions in high-speed heavy rail steel[J]. Iron and Steel, 2020, 55(1): 38-46. |
| [5] |
LIN Jie, YANG Cheng, WANG Yuanming, MOU Fenyun, HOU Dong, WANG Deyong. Deoxidation thermodynamics in electroslag remelting process[J]. Iron and Steel, 2019, 54(9): 44-49. |
| [6] |
LI Muming，YU Huixiang，PAN Ming，BAI Hao. Effect of refining slag on nonmetallic inclusions in #br# high manganese steel[J]. Iron and Steel, 2019, 54(6): 37-42. |
|
|
|
|
2018, Vol. 53 
