Microalloyed Steels for High-Strength Forgings

摘要：

　　In the past thirty-five years,two families of microalloyed (MA) steels have been developed for high strength bar and forging applications.The first family was introduced in 1974 and represented the medium carbon steels to which were added small amounts of niobium or vanadium.These early medium carbon contents steels exhibited pearlite-ferrite microstructures and showed good strength and high-cycle fatigue resistance.About 15 years later,microalloyed multiphase steels were introduced,which had microstructures comprised of mixtures of ferrite,bainite,martensite,and retained austenite,depending on the composition and processing.These steels were capable of reaching very high strengths,with good fatigue resistance and high fracture resistance.Prior to the early 1970s,high strength forgings could be obtained only by final heat treatment,involving reheating,quenching and tempering (QT).It has been shown repeatedly that the air cooled forgings made from MA pearlite-ferrite steels can exhibit strengths and fatigue resistances similar to those of the more expensive heat treated forgings.This paper will follow the development of the microalloyed pearlite-ferrite steels over the past 35 years.

关键词： Microalloyed forging steels High strength Microstructures Pearlite-ferrite steels Heat treatment

作者: Mingjian Hua Xiaojun Liang Anthony J. DeArdo

作者单位: Basic Metals Processing Research Institute,Department of Mechanical Engineering and Materials Scienc Basic Metals Processing Research Institute,Department of Mechanical Engineering and Materials Scienc

会议类型: 国际会议

会议名称: The 2nd International Symposium on Automobile Steel (第二届汽车用钢生产及应用技术国际研讨会)

会议地点: 鞍山

会议语种:英文

页码: 311-317

在线出版日期: 2013-05-21（万方平台首次上网日期，不代表论文的发表时间）