不同热输入Q450NQR1钢焊接过热区组织、硬度和冲击韧性的研究

黄显峰; 赵娇玉; 黄君辉; 金鹏

doi:10.7512/j.issn.1001-2303.2020.04.19

焊接工艺 | 浏览量 : 0 下载量: 116 CSCD: 1

PDF
导出
分享
收藏
专辑

不同热输入Q450NQR1钢焊接过热区组织、硬度和冲击韧性的研究
Study on microstructure,hardness and impact toughness of welding overheated zone of Q450NQR1 steel with different heat inputs
2020年50卷第4期页码：107-110
DOI： 10.7512/j.issn.1001-2303.2020.04.19

扫描看全文

黄显峰, 赵娇玉, 黄君辉, 等. 不同热输入Q450NQR1钢焊接过热区组织、硬度和冲击韧性的研究[J]. 电焊机, 2020,50(4):107-110.

HUANG Xianfeng, ZHAO Jiaoyu, HUANG Junhui, et al. Study on microstructure,hardness and impact toughness of welding overheated zone of Q450NQR1 steel with different heat inputs[J]. 2020,50(4):107-110.
黄显峰, 赵娇玉, 黄君辉, 等. 不同热输入Q450NQR1钢焊接过热区组织、硬度和冲击韧性的研究[J]. 电焊机, 2020,50(4):107-110. DOI： 10.7512/j.issn.1001-2303.2020.04.19.

HUANG Xianfeng, ZHAO Jiaoyu, HUANG Junhui, et al. Study on microstructure,hardness and impact toughness of welding overheated zone of Q450NQR1 steel with different heat inputs[J]. 2020,50(4):107-110. DOI： 10.7512/j.issn.1001-2303.2020.04.19.

摘要

通过焊接热模拟技术对Q450NQR1高强度耐候钢在不同的焊接热输入下过热区的组织、硬度和冲击性能进行了工艺研究。结果表明:随着焊接热输入的增加,显微组织先共析铁素体由针状向块状转变,粒状贝氏体含量逐渐增多,硬度整体逐渐降低,低温冲击功整体差别不大,冲击断口均为解理断裂,边缘为大小不一的韧窝形态。

Abstract

Through the welding thermal simulation technology,the microstructure,hardness and impact toughness of the overheated zone of Q450 NQR1 high-strength weathering steel with different welding heat input were studied. The results show that as the welding heat input increases,the microstructure of the pro-eutectoid ferrite changes from needle to block,granular bainite content gradually increases,overall hardness gradually reduces,low temperature impact energy has little difference,the impact fractures are all cleavage fractures,the edges are in the form of dimples with different sizes.