Research on the microstructure and properties of the low alloy steel heat-affected zone by the manual temper bead technique

YE Yihai; ZHENG Dexu; LUO Xuzhen; WANG Jian; SHANG Wei; ZHU Qimeng; ZHU Yonghui

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Research on the microstructure and properties of the low alloy steel heat-affected zone by the manual temper bead technique
Vol. 48, Issue 5, Pages: 34-39(2018)
Published：2018
DOI：
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DOI：

YE Yihai, ZHENG Dexu, LUO Xuzhen, et al. Research on the microstructure and properties of the low alloy steel heat-affected zone by the manual temper bead technique[J]. Eletric Welding Machine2018, 48(5): 34-39. DOI：

摘要

采用焊条电弧焊回火焊接工艺在核级低合金钢S271板开槽试件上堆焊核级低合金钢焊条制备焊接试验件

利用该试件研究局部增加焊接热循环对低合金钢热影响区(HAZ)组织性能的影响以及回火堆焊层厚度对HAZ组织性能的影响。结果表明:未增加补充焊道的试件

焊趾位置HAZ回火效果不够充分

局部组织有回火马氏体和残余奥氏体晶界存在

冲击韧性相对较低;增加补充焊道的试件

焊趾位置HAZ残余奥氏体分解和回火马氏体组织分解转化充分

虽然硬度略有偏高

但冲击韧性改善显著;焊接过程中去除部分回火焊层厚度

可有效改善HAZ回火效果

且在一定厚度范围内

随着上一层回火焊层打磨量的增加

对应的样品HAZ显微硬度呈下降趋势

冲击韧性呈明显上升趋势。

Abstract

In this paper

the welding test pieces were prepared by surf acing the low-alloy steel electrode on S271 plate grooving specimens of nuclear grade low-alloy steel by electrode arc welding manual temper bead technique. The influence of local increase of welding heat cycle on the microstructure and properties of HAZ and the influence of the thickness of tempered surfacing layer on the microstructure and properties of HAZ were studied. And the results showed that

the tempering furnace of the microstructure of the HAZ nearby weld toe was insufficient without increasing the welding thermal cycle;and the impact toughness was bad which caused by the martensitic and the interface of retained austenite in the HAZ

the martensitic was detected

the interface of retained austenite was disappeared

and the impact toughness was improved obviously

while increasing the welding thermal cycle. The tempering furnace of the microstructure was improved obviously by part of layer removed. And the value of the hardness（HV0.2） was reducing and the value impact toughness was increasing

with the increasing thickness of grinding.