向嵩1,2,向梓杰1,2,沈涛1,2.渗碳体形态对高碳珠光体钢组织及性能的影响[J].湖南大学学报:自然科学版,2017,44(12):47~54
渗碳体形态对高碳珠光体钢组织及性能的影响
Effect of Cementite Morphology on Microstructure and Properties of High Carbon Pearlite Steel
  
DOI:
中文关键词:  大过冷  珠光体  渗碳体形态  纳米级渗碳体  力学性能
英文关键词:supercooling  pearlite  cementite morphology  nanoscale cementites  mechanical properties
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作者单位
向嵩1,2,向梓杰1,2,沈涛1,2 (1.贵州大学 材料与冶金学院贵州 贵阳 550025; 2.贵州省材料结构与强度重点实验室贵州 贵阳 550025) 
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中文摘要:
      为研究SWRS82B钢不同条件下进行的大过冷工艺所形成的渗碳体形态对珠光体亚结构组织及性能的影响,制定相关热处理工艺: 将试样在880 ℃奥氏体化15 min后,以70,100,200 ℃/s的冷速过冷到300 ℃等温3~15 s,之后升温至珠光体区等温1 min,最后快冷至室温.通过SEM和TEM观察,以及MTS拉伸试验机得到的数据,结果表明,在过冷时间为3 s的前提下,随着冷速的增长,渗碳体由完整片层状发生不同程度的碎化.在200 ℃/s时,渗碳体已经大面积碎化,并发现大量的纳米级渗碳体,抗拉强度表现为先降低后升高,伸长率持续升高.当冷却速度为70 ℃/s时,随着过冷时间的延长,抗拉强度和伸长率都表现为先降低后增大的特点.纳米渗碳体随着过冷时间的延长开始减少,到达15 s时,开始出现了贝氏体组织.
英文摘要:
      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.
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