On microstructure and performance of tempered high-boron high-speed steel roll  

作　　者：Fu Hanguang Du Zhongze Li Ping Jiang Yehua Zhou Rong Cen Qihong Hou Jianqiang Lei Yongping Guo Hongxing 

机构地区：[1]School of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China [2]School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,Shaanxi,China [3]School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China [4]Yunnan Kun-Steel Heavy Equilnnent Manufacturing Group Ltd.,Kunming 650501,Yunnan,China

出　　处：《China Foundry》2012年第3期252-257,共6页中国铸造（英文版）

基　　金：supported by the Scientific Plan Project of Beijing Education Committee (PXM2012- 014204-00-000136, PXM2012-014204-00-000156);the National Natural Science Foundation of China (Grant No. 51054008);Science and Technology Cooperating Project of Yunnan Province, China (Grant No.2010AD012)

摘　　要：Influences of the tempering temperature on the microstructure, mechanical property and wear resistance of High-Boron High Speed Steel （HBHSS） roll materials were investigated by means of optical microscopy, scanning electron microscopy （SEM）, X-ray diffraction, hardness measurement, impact tester, tensile tester and pin abrasion tester. The results show that the as-cast structure of HBHSS consists of a great amount of martensite and M2（B,C） and a few retained austenites and M23（B,C）6. After solution treated at 1,050℃ and followed by oil cooling, the amount of M23（B,C）6 carbo-borides in quenched HBHSS increases obviously and the macrohardness of the quenched HBHSS is 66 HRC, which is very close to the 65.8 HRC of as-cast HBHSS. On the whole, the hardness of HBHSS alloy shows a trend of slight decrease with increasing tempering temperature when tempered below 500 ℃. While when above 500 ℃, the hardness increases slightly as the tempering temperature increases and reaches a peak at 525 ℃ and then decreases obviously. The impact toughness of HBHSS has a tendency to increase as the tempering temperature increases. Tempering can improve the tensile strength and elongation of HBHSS, but a higher tempering temperature causes a slight decrease in both tensile strength and elongation. Excellent wear resistance can be obtained by tempering at 500 to 550 ℃.Influences of the tempering temperature on the microstructure, mechanical property and wear resistance of High-Boron High Speed Steel (HBHSS) roll materials were investigated by means of optical microscopy, scanning electron microscopy (SEM), X-ray diffraction, hardness measurement, impact tester, tensile tester and pin abrasion tester. The results show that the as-cast structure of HBHSS consists of a great amount of martensite and M2(B,C) and a few retained austenites and M23(B,C)6. After solution treated at 1,050 °C and followed by oil cooling, the amount of M23(B,C)6 carbo-borides in quenched HBHSS increases obviously and the macrohardness of the quenched HBHSS is 66 HRC, which is very close to the 65.8 HRC of as-cast HBHSS. On the whole, the hardness of HBHSS alloy shows a trend of slight decrease with increasing tempering temperature when tempered below 500 °C. While when above 500 °C, the hardness increases slightly as the tempering temperature increases and reaches a peak at 525 °C and then decreases obviously. The impact toughness of HBHSS has a tendency to increase as the tempering temperature increases. Tempering can improve the tensile strength and elongation of HBHSS, but a higher tempering temperature causes a slight decrease in both tensile strength and elongation. Excellent wear resistance can be obtained by tempering at 500 to 550 °C.

关 键 词：high boron high speed steel tempering temperature carbo-boride metallic matrix mechanical properly wear resistance 

分 类 号：TG142.45[一般工业技术—材料科学与工程]