Effects of welding heat input on CGHAZ microstructures and mechanical properties for high strength low alloy steel

SUN Xiuwei; LIANG Guoli

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Effects of welding heat input on CGHAZ microstructures and mechanical properties for high strength low alloy steel
Vol. 49, Issue 10, Pages: 97-100(2019)
DOI：

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SUN Xiuwei, LIANG Guoli. Effects of welding heat input on CGHAZ microstructures and mechanical properties for high strength low alloy steel. [J]. 49(10):97-100(2019)
DOI：

SUN Xiuwei, LIANG Guoli. Effects of welding heat input on CGHAZ microstructures and mechanical properties for high strength low alloy steel. [J]. 49(10):97-100(2019) DOI：

摘要

以低合金高强度船板钢为研究对象,分析焊接热输入对粗晶热影响区(CGHAZ)组织及力学性能的影响。结果表明,当热输入较小时,粗晶热影响区组织为板条马氏体、板条贝氏体和少量针状铁素体,硬度和冲击韧性都较高;当热输入为100 kJ/cm时,组织为板条贝氏体、粒状贝氏体和大量由原奥氏体晶界向晶内生长的铁素体;随着热输入的增加,板条贝氏体逐渐减少,粒状贝氏体增加,且组织不断粗化,硬度和冲击韧性逐渐降低;当热输入为250 kJ/cm时,组织主要是粒状贝氏体、由晶界向晶内生长的铁素体和晶界铁素体,此时的CGHAZ组织与热输入较小时相比发生了明显的粗化,冲击韧性进一步降低。

Abstract

Effects of welding heat input on CGHAZ microstructures and mechanical properties of low alloy high strength ship plate steel were investigated by welding thermal simulation method. The result indicated that when welding heart input is smaller,the microst-ructure mainly consisted of lath bainite,granular bainite and some acicular ferrite,the hardness and the impact toughness were higher.The microstructure mainly consisted of lath bainite,granular bainite and lots of ferrites growing from original austenite grain boundary to intracrystalline when welding heat input was 100 kJ/cm. With the increase of welding heat input,the hardness and the impact toughness decreased,which caused mainly by the increasing of granular bainite and coarse grain size. The microstructure mainly consisted of granular bainite,ferrite growing from grain boundary to intracrystalline and grain boundary ferrite when welding heat input was 200 kJ/cm,and the impact toughness decreased further.