Study on microstructure,hardness and impact toughness of welding overheated zone of Q450NQR1 steel with different heat inputs

HUANG Xianfeng; ZHAO Jiaoyu; HUANG Junhui; JIN Peng

doi:10.7512/j.issn.1001-2303.2020.04.19

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Study on microstructure,hardness and impact toughness of welding overheated zone of Q450NQR1 steel with different heat inputs
Vol. 50, Issue 4, Pages: 107-110(2020)
Published：2020
DOI： 10.7512/j.issn.1001-2303.2020.04.19
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DOI：

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]. Eletric Welding Machine2020, 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.