摘要
通过药皮过渡合金元素,设计了四种碱性焊条,并利用焊接试验、金相分析、力学性能及断口扫描测试等方法,研究了药皮中合金元素对碱性焊条焊缝组织及性能的影响。结果表明,随着药皮合金元素含量的升高:试样焊缝组织相变化不大,均以回火索氏体和板条马氏体为主,并伴有少量的残余奥氏体和二次析出相,但组织逐渐由板条状变为细条状,且交错密度增大;焊缝强度变化不大,但冲击韧性大幅度提高,冲击断口的韧窝变得多而深;药皮中合金元素对焊缝组织及性能的影响是一个相辅相成又相互制约的过程,3#焊条合金配比使得碱性焊条焊缝组织和强韧性达到了较好的匹配。
Four basic electrodes were designed by the method of transition alloying elements through coating. The influence of coating alloying elements on microstructure and properties of basic electrode welded joints were studied by using welding test, metallurgical analysis, mechanical property testing and fracture scanning tests. The results showed that with the increase of alloying elements, the changes of four kinds of weld microstructure is small and mainly composed of tempered sorbite and lath martensite, and accompanied by a small amount of residual austenite and quadratic precipitated phase, but the microstructure gradually changed from lath to thin strips, and staggered density increases. What＇s more, the strength of four welded joints has a little changed, but the impact of toughness has a greatly im- proved and the fracture dimples became many and deep. Last, the effect of coating alloying elements on welds microstructure and properties is a complementary and mutual restraint process, and the content of alloying element in No.3 electrode makes the basic electrode weld strength and toughness to achieve a better matched.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2013年第2期113-118,共6页
Chinese Journal of Materials Research
基金
国家自然科学基金51274162
陕西省自然科学基金2012JM6003
西安市科技计划项目CX1250②资助项目~~
关键词
金属材料
药皮
合金元素
回火索氏体
板条马氏体
冲击韧性
metallic materials
coating
alloying element
tempered-sorbite
lath-martensite
impact toughness
