An Analysis on Forming Mechanism of Longitudinal Crack of N08810 Corrosion Resistant Alloy 200 mm Thickness Casting Slab

马骏; 郑宏光; 黄坚; 郭亮亮; 马天军

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An Analysis on Forming Mechanism of Longitudinal Crack of N08810 Corrosion Resistant Alloy 200 mm Thickness Casting Slab

更新时间：2026-01-21

- An Analysis on Forming Mechanism of Longitudinal Crack of N08810 Corrosion Resistant Alloy 200 mm Thickness Casting Slab
- Special Steel Vol. 33, Issue 3, Pages: 61-64(2012)
- 作者机构：
  
  1. 上海交通大学材料科学与工程学院,上海,200240
  2. 宝山钢铁股份有限公司研究院,上海,201900
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：17 November 2011，
  
  Online First：14 October 2022，
  
  Published：14 October 2012
- 稿件说明：
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马骏, 郑宏光, 黄坚, et al. An Analysis on Forming Mechanism of Longitudinal Crack of N08810 Corrosion Resistant Alloy 200 mm Thickness Casting Slab[J]. Special Steel, 2012, 33(3): 61-64.
DOI：

马骏, 郑宏光, 黄坚, et al. An Analysis on Forming Mechanism of Longitudinal Crack of N08810 Corrosion Resistant Alloy 200 mm Thickness Casting Slab[J]. Special Steel, 2012, 33(3): 61-64. DOI：

摘要

通过光学、扫描电子显微镜、能谱仪和G1eeble-3800热模拟试验机对1流立式连铸机生产的UNSN08810合金(/%:0.06C、0.45Si、0.92Mn、0.016P、0.001S、30.15Ni、19.80Cr、47.81Fe、0.33Ti、0.23Al、0.014 0N)200 mm×1 300 mm连铸坯的纵向裂纹进行了分析。结果表明

纵向裂纹沿粗大的柱状晶晶界向铸坯内部扩展、裂纹深度为18～20 mm。高温塑性试验得出

当温度≥1100℃时合金的断面收缩率急剧下降。分析表明

凝固初期柱状晶之间连接比较薄弱

易在晶界处开裂

加上晶界处脆性相TiC的析出

造成应力集中

并使裂纹更容易延晶界扩散

最终形成纵向裂纹。

Abstract

An analysis on longitudinal crack of 200 mm x 1 300 mm casting slab of UNS NO881O alloy (/% : 0. 06C

0. 45Si

0. 92Mn

0. 016P

0. 001S

30. 15Ni

19. 80Cr

47. 81 Fe

0. 33Ti

0. 23Al

0. 014 0N) produced by one-strand vertical continuous casting machine has been earned out by optical

scanning electron microscope

energy dispersive spectrometer and Gleeble-3800 thermal simulation machine. Results show that the longitudinal crack extends along grain boundary of coarse columnar crystal towards inner casting slab

the depth of crack is 18 ~ 20 mm. Test of high temperature plasticity of alloy obtains that as temperature ≥1100 °C the reduction of area of alloy dramatically decreases. And the analysis indicates that at early period of solidification the connection between columnar dendrites is weak

the boundary of columnar crystal easily cracks

in addition the brittle phase TiC deposits at grain boundary lead to stress concentration

the crack easily extends along grain boundary to form the longitudinal crack finally.

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