中碳结构钢中硫化物特征研究
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- 英文论文题名：Characterization of Sulfide Inclusions in a medium carbon steel
- 论文作者：罗俊斌 ; 杨文 ; 张立峰 ; 蔡常青 ; 许英华
- 英文论文作者：Junbin Luo ; Wend Yang ; Lifeng Zhang ; Changqing Cai ; Yinghua Xu ; School of Metallurgical and Ecological Engineering ; University of Science and Technology Beijing ; Sansteel Minguang Corporation Limited Fujian
- 年：2016
- 作者机构：北京科技大学冶金与生态工程学院;福建三钢闽光股份有限公司;
- 论文关键词：中碳结构钢 ; 硫化物 ; 形貌 ; 硫偏析 ; 冷却速度
- 英文论文关键词：medium carbon steel ; sulfide ; morphology ; sulfur segregation ; cooling rate
- 会议召开时间：2016-05-19
- 会议录名称：第十九届（2016年）全国炼钢学术会议大会报告及论文摘要集
- 语种：中文
- 分类号：TF77
- 学会代码：ZGJS
- 会议名称：第十九届（2016年）全国炼钢学术会议
- 会议地点：中国湖南长沙
- 主办单位：中国金属学会炼钢分会
- 学会名称：中国金属学会
- 页数：2
- 文件大小：161k
- 原文格式：O
- 会议级别：全国
摘要
中碳结构钢铸坯中硫化物的尺寸、形态和分布对中碳结构钢的性能有着决定性的影响。本文详细评估了中碳结构钢不种工况铸坯中MnS夹杂物形貌、尺寸的分布特征,结果显示铸坯边缘区域为第Ⅰ类球状MnS,中部区域为第Ⅱ类链状或树枝状MnS,且超大尺寸第Ⅱ类链状MnS夹杂物均沿粗大长条状枝晶晶界分布;随着硫含量增加,过热度增大,S元素偏析范围增大,铸坯内MnS夹杂物形貌从Ⅰ类向Ⅱ类转变的位置更加靠近内外弧边缘。根据Uhlmann的凝固前沿夹杂物析出模型以及铸坯化学成分分析,认为冷却速度、过热度和硫元素偏析对MnS夹杂物形貌和尺寸分布有着重要影响,冷却速度越快,越易形成Ⅰ类MnS夹杂物,过热度越高,硫元素偏析越严重,越有利于形成Ⅱ类MnS夹杂物。
The properties of medium carbon steel were determined by the morphology and size distribution of sulfides in the steel.Therefore,it is necessary to study the morphology and size distribution of MnS inclusions in medium carbon steel billet.The results show that the sulfides evolve from globular type Ⅰ to dendritic or chain-like type Ⅱ with the position moving from edge to center at the cross section,and the large chain-like type Ⅱ MnS inclusions were along the dendrite grain boundary.With the sulfur content and superheat increasing,the segregation ratio range of sulfur increased and the position of the morphology transition of MnS inclusions from type Ⅰ to type Ⅱ was closer to the edge.Based on Uhlmann model and chemical compositions of the billet,it is suggested that cooling rate,superheat and sulfur segregation play an important role in controlling the morphology and diameter of MnS inclusions.The increasing cooling rate facilitates the formation of type Ⅰ MnS,but was unfavorable to the growth of MnS.Superheat and sulfur segregation contributes to the formation of type Ⅱ MnS.
The properties of medium carbon steel were determined by the morphology and size distribution of sulfides in the steel.Therefore,it is necessary to study the morphology and size distribution of MnS inclusions in medium carbon steel billet.The results show that the sulfides evolve from globular type Ⅰ to dendritic or chain-like type Ⅱ with the position moving from edge to center at the cross section,and the large chain-like type Ⅱ MnS inclusions were along the dendrite grain boundary.With the sulfur content and superheat increasing,the segregation ratio range of sulfur increased and the position of the morphology transition of MnS inclusions from type Ⅰ to type Ⅱ was closer to the edge.Based on Uhlmann model and chemical compositions of the billet,it is suggested that cooling rate,superheat and sulfur segregation play an important role in controlling the morphology and diameter of MnS inclusions.The increasing cooling rate facilitates the formation of type Ⅰ MnS,but was unfavorable to the growth of MnS.Superheat and sulfur segregation contributes to the formation of type Ⅱ MnS.
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