METALLURGICAL/ALLOY OPTIMIZATION OF HIGH STRENGTH AND WEAR RESISTANT STRUCTURAL QUENCH AND TEMPERED STEELS
Structural steels with yield strength requirements greater or equal to 690 MPa can be produced through controlled recrystallization hot rolling coupled with precipitation strengthening or purposeful heat treatment through quench and tempering(Q&T).High strength structural steel and wear/abrasion resistant requirements greater or equal to 360 Brinell hardness(BHN)are produced by the development of microstructures of tempered lower bainite and/or martensite through the Q&T process.While these Q&T microstructures can produce very high strengths and hardness levels making them ideal for 690 MPa plus yield strength or wear/abrasion resistant applications,they lack toughness/ductility and hence are very brittle and prone to cracking.While tempering the microstructures helps in improving the toughness/ductility and reducing the brittleness,strength and hardness can be sacrificed.In addition,these steels typically consist of alloy designs containing boron with carbon equivalents(CE)greater than 0.50 to achieve the desired microstructures.The higher CE has a negative influence on weldability.
Niobium Boron Titanium Fine Grain Size Precipitation Bainite
Douglas G.Stalheim Fu Peimao Gu Linhao Zhang Yongqing
DGS Metallurgical Solutions,Inc.,15003 NE 10th Street,Vancouver,WA,98684,USA TISCO R&D,Taiyuan,China Shougang R&D,Beijing,China CITIC Metal,Beijing China
国内会议
杭州
英文
995-1001
2015-11-11（万方平台首次上网日期，不代表论文的发表时间）