C和W对低合金Cr-Mo钢焊缝金属组织和冲击韧性的影响

doi:10.11901/1005.3093.2020.530

材料研究学报

2021, Vol. 35

Issue (7): 481-492 DOI: 10.11901/1005.3093.2020.530

研究论文

本期目录 | 过刊浏览

C和W对低合金Cr-Mo钢焊缝金属组织和冲击韧性的影响

朱高文¹^,², 吴栋¹, 陆善平¹(

)

^1.中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016
^2.中国科学技术大学材料科学与工程学院沈阳 110016

Effect of C- and W-content on Microstructure and Toughness of Weld Metal for Low Alloy Cr-Mo Steel

ZHU Gaowen¹^,², WU Dong¹, LU Shanping¹(

)

^1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

引用本文:

朱高文, 吴栋, 陆善平. C和W对低合金Cr-Mo钢焊缝金属组织和冲击韧性的影响[J]. 材料研究学报, 2021, 35(7): 481-492.
Gaowen ZHU, Dong WU, Shanping LU. Effect of C- and W-content on Microstructure and Toughness of Weld Metal for Low Alloy Cr-Mo Steel[J]. Chinese Journal of Materials Research, 2021, 35(7): 481-492.

全文: PDF(49178 KB) HTML

摘要:

使用OM、SEM、EPMA、EBSD等手段并进行热膨胀和冲击等实验，研究了C和W元素对第四代钠冷快堆用低合金Cr-Mo钢钨极氩弧焊(TIG)熔敷金属微观组织和冲击韧性的影响。结果表明：多道次焊接热循环使多层多道焊缝金属的组织分布不均匀，分为表层焊缝组织和中间焊缝组织。表层焊缝组织，可分为熔化区(MZ)、粗晶区(CGHAZ)、细晶区(FGHAZ)、不完全相变区(ICHAZ)、临界再热粗晶区(ICCGHAZ)以及亚临界再热区(SCHAZ)。在中间焊缝金属中，有沿着原奥晶界分布的链状组织和等轴晶组织。等轴晶组织为回火贝氏体，韧性较好。链状组织中含有大量的二次硬化相M-A组元且存在应力集中，促进裂纹萌生并恶化焊缝金属韧性。提高C含量能促进表层焊缝金属中板条贝氏体和中间焊缝金属中链状组织的形成，从而恶化焊缝金属韧性；提高W含量能促进表层焊缝金属中板条贝氏体的形成、抑制中间焊缝金属中链状组织的形成，从而改善焊缝金属的韧性。

关键词 ：金属材料, Cr-Mo钢焊缝金属, 元素含量, 链状组织, 冲击韧性

Abstract：

The effect of C- and W-content on the microstructure and impact toughness of the weld metals for 2.25Cr1Mo steel weld via tungsten argon arc welding (TIG) technique was investigated by means of OM, SEM, EPMA, EBSD, thermal expansion- and impact-test. The results show that the microstructure of the multi-layer and multi-pass weld metal was heterogeneous, which can be divided into upper weld metal and intermediate weld metal. The upper weld metal can be divided into melting zone (MZ), coarse grain heat affected zone (CGHAZ), fine grain heat affected zone (FGHAZ), inter-critical heat affected zone (ICHAZ), inter-critically reheat coarse grain heat affected zone (ICCGHAZ) and sub-critical heat affected zone (SCHAZ). Intermediate weld metal composed of necklace-type microstructure which distribute along the prior austenite grain boundary and equiaxed crystal structure. The equiaxed crystal structure was tempered bainite with good toughness. Necklace-type microstructure composed of a large number of M-A constituents, which could easily cause stress concentration and promote crack initiation, whereas, deteriorate the toughness of weld metal. Increasing C content could promote the formation of lath bainite in upper weld metal and necklace-type microstructure in intermediate weld metal, which deteriorated the toughness of weld metal; However, increasing W content could promote the formation of lath bainite in upper weld metal and inhibit the formation of necklace-type microstructure in intermediate weld metal, which is beneficial to improving the toughness of weld metal.

Key words： metallic materials Cr-Mo weld metal element content necklace-type microstructure impact toughness

收稿日期: 2020-12-17

ZTFLH:

TG424

基金资助:辽宁省科技重大专项(2020JH1/10100001);辽宁省自然科学基金(2019JH3/30100039)

作者简介: 朱高文，男，1994年生，硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.530 或 https://www.cjmr.org/CN/Y2021/V35/I7/481

表1 TIG焊接工艺参数

图1 焊接接头的示意图

表2 熔敷金属和母材的化学成分

图2 冲击试样的取样位置

图3 热循环工艺

图4 多层多道焊缝金属的OM图

图5 表层焊缝各亚区显微组织的SEM图

表3 表层焊缝各亚区的焊接热循环温度范围

图6 中间焊缝金属组织表征

图7 链状组织表征

图8 链状组织的EBSD分析

图9 不同C含量焊缝金属显微组织OM图

图10 不同C含量焊缝金属的CCT曲线

图11 不同W含量焊缝金属显微组织OM图

图12 不同W含量焊缝金属的CCT曲线

图13 不同C含量焊缝金属的冲击吸收功

图14 不同C含量中间焊缝组织的SEM图

图15 不同C含量焊缝金属二次裂纹的SEM图

图16 二次裂纹的SEM图

图17 不同W含量焊缝金属的冲击吸收功

图18 不同W含量焊缝金属中间焊缝组织的SEM图

图19 不同W含量焊缝金属二次裂纹的SEM图

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