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Impacts of Different Tempering Temperatures on Microstructure and Properties of High-strength Heat-treated Rail
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Ke Zhou1, Fengming Zhang1, Hudong Xue1, 2, 3, Ying Bian1, Haoran Wen1, Yongbo Zhang1
Science & Technology of Baotou Steel | 2025, 51(3) : 43 - 49
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Science & Technology of Baotou Steel | 2025, 51(3): 43-49
• Variety Quality and Experimental Study •
Impacts of Different Tempering Temperatures on Microstructure and Properties of High-strength Heat-treated Rail
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Ke Zhou1, Fengming Zhang1, Hudong Xue1, 2, 3, Ying Bian1, Haoran Wen1, Yongbo Zhang1
Affiliations
  • 1. Technical Center of Inner Mongolia Baotou Steel Union Co., Ltd., Baotou 014010,Inner Mongolia Autonomous Region, China
  • 2. Beijing Baotou Steel Technology Co., Ltd., Beijing 100083, China
  • 3. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
Published: 2025-06-25
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In this paper, two types of online as-heat-treated pearlite rails are tempered. The optimal tempering process of two types of high-strength heat-treated rail is obtained based on the changes of mechanical properties and microstructure for the rails under different tempering temperatures. The results showed that the comprehensive mechanical properties of rail could be improved by low temperature tempering within the range of 200~350 ℃. With the increase of tempering temperature, residual stress of rail web tends to be decreased. The residual stresses of rail web for the two types of rail are 45 MPa and 32 MPa respectively with tempering at 350 ℃, which are decreased by 63.4% and 80.6% compared with those before tempering. The hardness, toughness and plasticity of tempered rail are improved with the increase of tempering temperature. The hardness is significantly increased with the improvement of plasticity and toughness. The tread hardness (HBW) of rail is increased by 13 and 8 respectively with tempering at 350 ℃ as well as the tempered rail is still with typical perlite structrure.

heavy rail steel  /  tempering  /  microstructure  /  properties
Ke Zhou, Fengming Zhang, Hudong Xue, Ying Bian, Haoran Wen, Yongbo Zhang. Impacts of Different Tempering Temperatures on Microstructure and Properties of High-strength Heat-treated Rail[J]. Science & Technology of Baotou Steel, 2025 , 51 (3) : 43 -49 .
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Article Info
  • Receive Date：2025-03-02
  • Online Date：2025-10-17
  • Published：2025-06-25
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  • Received：2025-03-02
Affiliations
    1. Technical Center of Inner Mongolia Baotou Steel Union Co., Ltd., Baotou 014010,Inner Mongolia Autonomous Region, China
    2. Beijing Baotou Steel Technology Co., Ltd., Beijing 100083, China
    3. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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