北京科技大学学报Issue(1)：56-62,7.DOI:10.13374/j.issn1001-053x.2014.01.009
常化后冷却工艺对1600 MPa级超高强钢组织性能的影响
Effect of cooling process after normalizing on the microstructure and properties of 1600 MPa ultra-high strength steel
余伟 1齐越 1李亮 1孙广杰 1万德成 1董长征1
作者信息
- 1. 北京科技大学高效轧制国家工程研究中心，北京100083
- 折叠
摘要
Abstract
The effects of two different processes, normalizing with air cooling + tempering and normalizing with controlled cooling+ tempering, on the retained austenite and mechanical properties of medium-carbon low-alloy martensitic ultra-high strength steel were investigated to improve its plasticity and toughness. The microstructure of the steel was observed by scanning electron microscopy ( SEM) . The volume fraction, shape and distribution of retained austenite in the steel were measured by X-ray diffraction ( XRD) and electron back-scattering diffraction (EBSD). The results show that lath martensite and retained austenite (M+RA) are obtained by the two processes and a uniform distribution of retained austenite is located between lath martensites. The volume fraction of retained austenite varies from 3% to 10% with treatment parameters. Normalizing with controlled cooling can significantly refine lath martensite while the yield strength and tensile strength increase more than 100 MPa and the impact energy decreases by 4 J. When the quenching temperature rises, the volume fraction of retained martensite increases firstly and then decreases. Normalizing with controlled cooling can also act as a method for improving the microstructure and properties of martensitic steel.关键词
超高强钢/常化处理/控制冷却/马氏体/残余奥氏体/力学性能Key words
high strength steel/normalizing/controlled cooling/martensitic steel/retained austenite/mechanical properties分类
矿业与冶金引用本文复制引用
余伟,齐越,李亮,孙广杰,万德成,董长征..常化后冷却工艺对1600 MPa级超高强钢组织性能的影响[J].北京科技大学学报,2014,(1):56-62,7.
