焊接温度对碳钢/奥氏体不锈钢扩散焊接头界面组织及性能的影响

发布时间：2022-12-11 02:58

　　采用真空扩散焊接方法对Q235A低碳钢与AISI304奥氏体不锈钢进行固相扩散连接实验,研究了焊接温度对接头界面组织、力学性能和反应产物的影响。结果表明:Q235A低碳钢/AISI304奥氏体不锈钢复合界面附近形成了合金铁素体层（Ⅱ区）和增C层（Ⅲ区）,界面两侧异相组织通过扩散结成共用晶界。在焊接温度850℃,焊接压力10 MPa,焊接时间60 min条件下,接头强度和韧性达到最大值,高于Q235A低碳钢母材。焊接温度过低（≤800℃）,接头中析出碳化物Cr₂₃C₆,焊接温度过高（≥900℃）,接头中会产生二次碳化物和金属间化合物,脆性的化合物偏析相使接头强韧性显著下降。严格控制焊接温度在850℃区间,并在焊后迅速淬火越过低温区,可有效避免脆性化合物偏析,从而保证扩散焊接头的性能。 

【文章页数】：8 页

【文章目录】：
1 实验方法
2 实验结果和分析
    2.1 接头宏观结构
    2.2 接头微观结构
    2.3 界面元素分布
    2.4 接头力学性能
        2.4.1 显微硬度
        2.4.2 抗拉强度
        2.4.3 冲击韧性和断裂特征
3 结论


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