余璐,李晶,刘伟建,蔡可森,曹余良,姚永宽,李翔

• 1:北京科技大学钢铁冶金新技术国家重点实验室
• 2:南京钢铁集团中厚板卷厂
• 3:江苏省高端钢铁材料重点实验室

摘要(Abstract)：

利用Gleeble-3500热模拟试验机在温度为1000~700℃的条件下进行了热拉伸实验,结合应力-应变曲线、析出物、断口组织形貌的观察及分析,研究了冷速对铸坯高温塑性的影响。结果表明,冷速的提高会降低低碳微合金钢的高温塑性,使第Ⅲ脆性区间变窄;冷速从1℃/s增加至3℃/s对钢中含Nb、Ti析出物的形貌、尺寸和γ-α相变开始温度区间无显著影响。较低冷速更有利于晶间铁素体的长大;铁素体薄膜的长大是第Ⅲ脆性区间塑性改善的主要原因。

关键词(KeyWords)： 冷却速度;高温塑性;铁素体相变

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 余璐,李晶,刘伟建,蔡可森,曹余良,姚永宽,李翔

DOI: 10.13289/j.issn.1009-6264.2015.s2.012

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