Effects of M/A island on microstructure and property of inter-critical heat affected zone in T24 steel welded joints

WANG Zhengpin; ZHAO Yang; WANG Hongzhe; YAO Yuhong; JIN Yaohua; SHANGGUAN Xiaofeng; YU Zaisong

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Effects of M/A island on microstructure and property of inter-critical heat affected zone in T24 steel welded joints

更新时间：2025-09-28

- Effects of M/A island on microstructure and property of inter-critical heat affected zone in T24 steel welded joints
- Thermal Power Generation Vol. 45, Issue 4, Pages: 89-94(2016)
- 作者机构：
  
  1. 西安工业大学陕西省光电功能材料与器械重点实验室
  2. 西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TG457.11
- Published：2016
- 稿件说明：
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WANG Zhengpin, ZHAO Yang, WANG Hongzhe, et al. Effects of M/A island on microstructure and property of inter-critical heat affected zone in T24 steel welded joints[J]. Thermal power generation, 2016, 45(4): 89-94.
DOI：

WANG Zhengpin, ZHAO Yang, WANG Hongzhe, et al. Effects of M/A island on microstructure and property of inter-critical heat affected zone in T24 steel welded joints[J]. Thermal power generation, 2016, 45(4): 89-94. DOI：

摘要

为研究M/A岛对T24钢焊接接头不完全淬火区(ICHAZ)冲击性能的影响

本文对T24钢在580

900和950℃下进行亚温正火

采用扫描电镜、透射电镜、维氏硬度、冲击试验等方法对T24钢ICHAZ的组织和冲击性能进行了研究。结果表明:经不同温度亚温正火的T24钢ICHAZ晶界均分布有硬脆相M/A岛;随着正火温度的升高

ICHAZ的M/A岛含量与尺寸均显著增大

而ICHAZ冲击吸收能量大幅降低;在冲击载荷的作用下

M/A岛会因周边的应力集中而极易成为裂纹源;M/A岛含量与尺寸的增加会使材料的冲击断裂机制由准解理断裂转变为解理断裂。

Abstract

To investigate the effect of M/A island on impact properties of inter-critical heat affected zone(ICHAZ)in T24 steel welding joint

subcritical normalizing on the T24 steel was carried out at different temperatures

and several tests such as scanning electron microscope(SEM)

transmission electron microscope(TEM)

Vickers hardness test and impact experiments were performed.The results show that

hard and brittle M/A islands distributed in the grain boundary of ICHAZ in the T24 steel suffered subcritical normalizing at different temperatures.With an increase in the normalizing temperature

the amounts and size of the M/A islands increased significantly and the impact absorbed energy decreased linearly.Under the impact load action

the M/A islands which located in grain boundaries could become crack sources easily due to the three dimensional stresses concentration.The impact fracture mechanism of the material changed from quasi-cleavage to cleavage as the relative amounts and size of the M/A islands increased.

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