Microstructure and Performance Analysis of Nb Microalloy Steel
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摘要: 随着现代铁路高速、重载运输的发展,对重轨钢的质量和性能提出了更高、更苛刻的要求。目前国产热轧980 MPa级(U75V)钢轨已不能满足线路使用的要求,为了开发出超高硬度及强度的高速重轨钢,采用Nb微合金化技术,通过实验室研究得出:当微合金化元素Nb的含量为0.028%时,重轨试验钢的力学性能达到最大值即抗拉强度为1229 MPa、屈服强度为716 MPa、硬度为HB343、伸长率为11%;重轨试验钢的组织性能达到最好值即珠光体片层间距为0.26 μm,晶粒度等级提高,晶粒变得细小,晶粒度等级为8 ~ 8.5级。该研究为超高强度和硬度级别重轨钢的开发应用提供了参考。Abstract: With the development of high speed and heavy load transportation in modern railway,higher demanding requirements have been put forward for performance of high speed rail steel.At present,domestic hot-rolled 980 MPa (U75V) rail cannot meet the requirements. Nb microalloying steel was produced in laboratory in order to develop ultra-high hardness and strength steel for speed rail.When Nb content is 0.028%,mechanical properties of high speed rail test steel reach the maximum value,ie,its tensile strength is 1 229 MPa,yield strength is 716 MPa,hardness is HB343 and elongation rate is 11%. And the microstructure performance of Nb test steel reaches the best state.Space between pearlite lamellar is 0.26 μm,and its grain size grade is ASTM No.8 to 8.5.
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Key words:
- high speed rail steel /
- Nb microalloying /
- mechanical properties /
- microstructure
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