<strong>2101</strong>节镍双相不锈钢立式连铸板坯的组织转变

doi:10.11901/1005.3093.2019.552

材料研究学报

2020, Vol. 34

Issue (6): 410-416 DOI: 10.11901/1005.3093.2019.552

研究论文

本期目录 | 过刊浏览

2101节镍双相不锈钢立式连铸板坯的组织转变

白亮¹^,²(

), 汲琨¹^,², 刘景顺¹^,², 刘军¹^,², 董俊慧¹^,², 楠顶¹^,²

1.内蒙古工业大学材料科学与工程学院呼和浩特 010051
2.内蒙古自治区石墨(烯)储能与涂料重点实验室呼和浩特 010051

Microstructure Transformation Process of Lean Duplex Stainless Steel 2101 in Vertical Continuous Casting Slab

BAI Liang¹^,²(

), JI Kun¹^,², LIU Jingshun¹^,², LIU Jun¹^,², DONG Junhui¹^,², NAN Ding¹^,²

1.Inner Mongolia University of Technology, Huhhot 010051, China
2.Inner Mongolia Key Laboratory of Graphite and Graphene for Energy Storage and Coating, Huhhot 010051, China

引用本文:

白亮, 汲琨, 刘景顺, 刘军, 董俊慧, 楠顶. 2101节镍双相不锈钢立式连铸板坯的组织转变[J]. 材料研究学报, 2020, 34(6): 410-416.
Liang BAI, Kun JI, Jingshun LIU, Jun LIU, Junhui DONG, Ding NAN. Microstructure Transformation Process of Lean Duplex Stainless Steel 2101 in Vertical Continuous Casting Slab[J]. Chinese Journal of Materials Research, 2020, 34(6): 410-416.

全文: PDF(7069 KB) HTML

摘要:

分析了2101双相不锈钢实际铸坯的宏观晶粒分布和微观组织转变。结果表明，2101双相不锈钢的柱状晶向等轴晶转变(CET转变)发生在二冷2区末端距铸坯表面25 mm处。在此区域内适当降低铸坯表面冷却强度有助于减小坯壳内部温度梯度促进CET转变，提高铸坯的等轴晶率和扩大角部的等轴晶区域；对微观组织的分析发现，在二冷6区之后提高冷却强度可调整铸坯中心形成的奥氏体形态，有利于晶内及晶界处奥氏体细化和减小晶界处针状奥氏体组织的数量和尺寸，从而在一定程度上提高铸坯的热变形能力。

关键词 ：金属材料, 铸坯组织, 实验研究, 2101双相不锈钢, 转变过程

Abstract：

The macro grain size distribution and microstructure change of the slab of Lean duplex stainless steel 2101 was investigated. It was concluded that columnar equiaxed crystal transformation (CET) occurred in the location, where is at the end of section No.2 of the secondary cooling zone with 25 mm from the slab surface. Decreasing the slab surface cooling strength in this zone will reduce internal temperature gradient in the shell, and promote CET transition, improve the rate of equiaxial crystal and expand the equiaxial zone at the corner. The results of microstructure analysis show that behind the section No. 6 in secondary cooling zone the morphology of austenite formed in the core of the billet can be adjusted by increasing the cooling intensity, which is also beneficial to the refinement of austenite morphology in the grain and at the grain boundary. Size of the acicular austenite structure at the grain boundary can be reduced, so as to improve the heat deformation ability of the billet.

Key words： Metallic materials Microstructure of slab Experimental study 2101 duplex stainless steel Transformation process

收稿日期: 2019-11-26

ZTFLH:

TG142.1+1

基金资助:国家自然科学基金(51474143);内蒙古自治区高等学校科学研究项目(NJZY19071);内蒙古自然科学基金(2015BS0510);内蒙古工业大学材料学重点学科团队(ZD202012)

作者简介: 白亮，男，1984年生，博士

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图1 工厂用连铸机的示意图

表1 铸机冷却水量信息表

表2 2101双相不锈钢化学成分 (质量分数，%)

图 2 铸坯试样的切样方向和位置

图3 连铸坯的组织

图4 铸坯组织的放大图

图5 铸坯的温度场和厚度变化Zone

图6 铸坯的宽面和窄面微观组织的对比

图7 柱状晶竞争生长与终止生长

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