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Effect of Cementite Morphology on Microstructure and Properties of High Carbon Pearlite Steel

被引：0
|
作者：
Xiang S. [1 ,2 ]
Xiang Z. [1 ,2 ]
Shen T. [1 ,2 ]
机构：
[1] School of Materials and Metallurgy, Guizhou University, Guiyang
[2] The Key Laboratory for Mechanical Behavior and Microstructure of Materials, Guiyang
来源：
Hunan Daxue Xuebao/Journal of Hunan University Natural Sciences | 2017年 / 44卷 / 12期
基金：
中国国家自然科学基金;
关键词：
Cementite morphology; Mechanical properties; Nanoscale cementites; Pearlite; Supercooling;
D O I：
10.16339/j.cnki.hdxbzkb.2017.12.008
中图分类号：
学科分类号：
摘要：
In order to study the effect of cementite morphology on the structure and properties of sub-structure of pearlite in SWRS82B steel, related heat treatment process was established: The sample was cooled to 300℃ at the cooling rate of 70, 100, 200℃/s and isothermal to 3~15 s after austenitized at 880℃ for 15 min.Then heated to isothermal at 550℃ for 1 min, the last was the rapid cooling to room temperature. The results of SEM and TEM observation and MTS tensile testing machine show that, when the supercooling time was 3 s, the cementite was fragmented by different degree from the whole lamellar with the increase of cooling rates. When the cooling rate was 200℃/s, the cementite was broken down in large area, and nanoscale cementite was found.The tensile strength decreased firstly and then increased, but the elongation increased continuously.When the cooling rate was 70℃/s, the tensile strength and elongation decreased with the increase of the supercooling time. The nanoscale cementite decrease with the extension of the supercooling time; while reached to 15 s, the low bainite began to appear. © 2017, Editorial Department of Journal of Hunan University. All right reserved.
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页码：47 / 54
页数：7
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