316L不锈钢焊条电弧焊焊接接头组织分析.pdf

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第43卷第3期
石油化工设备
ol. 43 No.3
2014年5月
PETRO-CHEMICAL EQUIPMENT
May 2014
文章编号:1000-7466(2014)03-0024-03
316L不锈钢焊条电弧焊焊接接头组织分析
杨剑赟1,蔡勤,葛亮亮2
(1.广东省特种设备检测研究院珠海检测院,广东珠海519002;
2.南通大力化工设备有限公司,江苏南通226401)
摘要:采用双面焊条电弧焊方法焊接了6mm厚的316L不锈钢,分析了焊接接头焊缝区、熔合区
及热影响区的组织并进行了显徽硬度测试。组织分析表明,接头焊缝区为等轴晶,组织为奥氏体基
体与数量较多的δ铁素体,且先焊焊鏠較后焊焊鏠的晶粒更为细小;熔合区与热影响区为树枝状晶
且有联生结晶的特点,组织为奥氏体基体十少量δ铁素体。显微硬度分布表明,接头焊缝硬度高于
母材硬度,低于熔合缄附近的树枝状晶硬度。
关键词:316L不锈钢;焊条电弧焊;组织分析;硬度
中图分类号:TG444;TQ050.4文献标志码:Adoi:10.3969/j.issn.10007462014.03.006
Structure Investigation of Shielded Metal Are Welding of 316L Stainless Stee.
YANG Jian-yun, CAI Qin, GE Liang-liang
(1. Zhuhai Inspection Institute of Guangdong Province Special Equipment Inspection
and Research Institute, Zhuhai 519002, China; 2. Nantong Dali Chemica
Equipment Co. Ltd, Nantong 26401, China)
Abstract: Double-sided shielded metal arc welding method was used to weld 6 mm thickness
316L stainless steel, the micro-structures of weld zone, fusion zone and heat affected zone and
micro-hardness were investigated. The result of structure analysis showed the microstructure of
the weld zone was equiaxed grain within Austenite and a large amount of 6-ferrite, and the gain
size of the prior weld was finer than the later weld; fusion zone and heat affected zone were den-
dritic crystal which had the characteristics of cogenetic crystallization, and the microstructure of
them were Austenite and a small amount of 6-ferrite: micro-hardness test showed the hardness of
weld zone was higher than the base metal but lower than the dendritic crystal of fusion zone.
Key words: 316L stainless steel; shielded metal arc welding; structure analysis; hardness
316L(0Cr17Ni4Mo2)不锈钢为超低碳奥氏少,而使用过程中焊接接头的裂纹形成与扩展均
体不锈钢,具有韧性好、耐高温、耐强酸腐蚀及焊与组织形态密切相关。因此,研究316L不锈钢的
接性能优异等特点,近年来被广泛应用于压力容接头组织对于扩展其应用有重要意义。
器、船舶、储罐及管线等行业?。在316L.不锈钢
张其枢等在研究奥氏体不锈钢焊接时,将接头
焊接过程中,受高温热作用,焊接接头组织会发生分为焊缝区、热影响区及母材区组织,但并未深入研
非平衡、非均匀转变,影响接头的抗裂性及耐蚀究接头各个区域组织。何芬等采用焊条电弧焊与
性
[3,4
目前的研究主要集中于316L不锈钢的耐熔化极活性气体保护焊(MAG)焊接了316L不锈
蚀性及工艺性[5?,针对接头组织的基础研究较钢,发现焊条电弧焊焊缝金属中δ铁素体含量比
收稿日期:2013-12-05
作者简介:杨剑赞(1987-),男,江西新余人,助理工程师,硕士,现从事特种设备检验工作