Effects of Cooling Rate and Copper Content on the Hardenability of Low-Prealloy
Sinter-hardening PM steel compositions allow the PM industry to eliminate the expense of austenitizing and oil quenching parts,which means shortening the production cycle and reducing the cost.the continuous sintering transformation curve(CSCT)is tested by thermal expansion method instead of the traditional CCT and TTT curves.The sinter-hardenability of the alloy is characterized by the change of the cooling rate curve and hardness.The hardenability of 1300WA pre-alloyed Ni-Mo steel and 5301SH pre-alloyed Ni-Mo-Mn steel powders,which prepared by water atomization,were studied by dilatometer and optical microscope with different cooling rate and copper content.The results show that both 1300WA and 5301SH exhibit excellent hardenability with copper and carbon content.The hardenability of 1300WA and 5301SH increases obviously with the increasing of cooling rate(0.56-1.94 ℃/s)and copper content(0-2.0 wt.%).By increasing the cooling rate and Cu content,the steel powder with low hardening performance can avoid producing pearlite to reduce bainite as much as possible,which is a way to achieve good mechanical properties.
Water atomization Pre-alloyed powder Hardenability Cooling rate Continuous sintering transformation curve
Su Fengge Zheng Zhuo Wang Zhirong
Jiande Yitong Metal Powder Material Co.,Ltd.,Hangzhou 344613,China
国际会议
北京
英文
2-7
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）