晶粒尺寸對車輪鋼解理斷裂韌性的影響

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基金項目:

國家高技術研究發展計劃資助項目(2009AA03Z505)

高等學校博士學科點專項科研基金資助項目(200800081006)

Effects of grain size on the cleavage fracture toughness of a wheel steel

1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China;
3. Technical Center of Ma'anshan Steel & Iron Corporation, Ma'anshan 243000, China;
4. Institute of Advanced Materials, University of Science and Technology Beijing, Beijing 100083, China

摘要: 通過緊湊拉伸試驗研究了碳的質量分數約為0.5%的C50車輪鋼解理斷裂韌性K_IC(即條件斷裂韌性K_Q)與晶粒尺寸的關系.結果表明,晶粒尺寸對試樣的斷裂韌性有明顯的影響,但決定車輪鋼解理斷裂韌性的是組織中最大的晶粒尺寸,而不是平均晶粒尺寸,最大晶粒尺寸越大,斷裂韌性越低.對于C50車輪鋼,當前5%的最大晶粒平均尺寸為30~73μm時,車輪鋼的條件斷裂韌性K_Q與晶粒平均尺寸的對數呈線性關系.
- 車輪鋼 /
- 晶粒尺寸 /
- 斷裂韌性 /
- 解理斷裂
Abstract: The relationship between grain size and cleavage fracture toughness K_IC, i.e., conditional fracture toughness K_Q, was investigated for a high speed wheel steel with 0.5% C by compact tension testing. It is indicated that the grain size has an evident effect on the fracture toughness. The fracture toughness is more dependent on the largest grain size than the average grain size of the C50 wheel steel. When the average size of the 5% largest grains is in the range of 30 to 73 μm, the cleavage fracture toughness K_Q decreases linearly with the logarithm of average size of these largest grains increasing.
- wheel steel /
- grain size /
- fracture toughness /
- cleavage fracture