Mg脫氧夾雜物對大線能量焊接HAZ組織的影響

徐龍云; 楊健; 王睿之

doi:10.13374/j.issn2095-9389.2020.04.05.s10

Mg脫氧夾雜物對大線能量焊接HAZ組織的影響

doi: 10.13374/j.issn2095-9389.2020.04.05.s10

徐龍云^{1, 2},
楊健^{1, 2, ,},
王睿之^{1, 2}

1.
上海大學材料科學與工程學院，上海 200444
2.
上海大學省部共建高品質特殊鋼冶金與制備國家重點實驗室，上海 200444

基金項目: 國家自然科學基金資助項目（U1960202）

詳細信息

通訊作者:
E-mail：yang_jian@t.shu.edu.cn

中圖分類號: TF76
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出版歷程
- 收稿日期: 2020-04-05
- 刊出日期: 2020-12-25

Influence of inclusions with Mg deoxidation on the microstructure in the heat-affected zone of steel plates after high-heat-input welding

XU Long-yun^{1, 2},
YANG Jian^{1, 2
, ,},
WANG Rui-zhi^{1, 2}

1.
School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
2.
State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China

More Information

Corresponding author: E-mail: yang_jian@t.shu.edu.cn

摘要

摘要: 研究了夾雜物對Mg脫氧鋼焊接熱影響區（HAZ）組織及沖擊韌性的影響。研究結果表明，MgO–MnS復合夾雜物形貌隨著Al的添加發生顯著變化。當Al質量分數為0.001%時，由中心單一MgO粒子與外圍MnS相組成；當Al質量分數為0.020%時，其形貌為夾雜物中多個細小的MgO粒子嵌入MnS相中。前者可誘發晶內針狀鐵素體（IAF）形核，而后者不具備該能力，故HAZ中主要晶內組織分別為塑性IAF、脆性側板條鐵素體。因此，未添加Al鋼的400 kJ·cm^?1大線能量焊接HAZ韌性優于添加Al鋼。
- Mg脫氧 /
- 夾雜物 /
- Al /
- 大線能量焊接 /
- 熱影響區 /
- 韌性
Abstract: The effects of inclusions on the microstructure and toughness of the heat-affected zone (HAZ) in steel plates with Mg deoxidation after high-heat-input welding were investigated in the present study. The results indicate that the morphologies of MgO–MnS complex inclusions in steel are changed obviously with the addition of Al. When containing 0.001% Al (mass fraction), the inclusions consist of a central single MgO particle and an outside MnS phase. When containing 0.020% Al, they are comprised of several small MgO particles entrapped by the MnS phase. Because the former inclusion can nucleate intragranular acicular ferrites (IAFs) and the latter is non-nucleant, the main intragranular microstructures in the HAZs are ductile IAFs and brittle ferrite side plates, respectively. Therefore, the HAZ toughness of the steel plate without Al addition after a high-heat-input welding of 400 kJ·cm^?1 is significantly better than that of the steel plate with Al addition.
- Mg deoxidation /
- inclusions /
- Al /
- high-heat-input welding /
- heat-affected zone /
- toughness

HTML全文

圖 1 典型MgO?MnS夾雜物形貌和成分。（a）3Mg1Al；（b）3Mg20Al

Figure 1. Morphologies and compositions of typical MgO–MnS inclusions: (a) 3Mg1Al; (b) 3Mg20Al

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圖 2 鋼中夾雜物尺寸分布

Figure 2. Size distribution of the inclusions in experimental steels

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圖 3 HAZ組織中夾雜物形貌及掃描電鏡面掃描圖像。（a～c）3Mg1Al；（d～f）3Mg20Al

Figure 3. Morphologies and SEM mapping images of the inclusions in the HAZ microstructures for experimental steels: (a?c) 3Mg1Al; (d?f) 3Mg20Al

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表 1 鋼樣化學成分（質量分數）

Table 1. Measured chemical compositions of steel samples %

Steels C Si Mn P S Ti Mg Al O N

3Mg1Al 0.082 0.22 1.56 0.006 0.005 0.011 0.0027 0.001 0.0011 0.0032
3Mg20Al 0.082 0.22 1.56 0.006 0.004 0.011 0.0027 0.020 0.0007 0.0032

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