摘要
采用焊接热模拟技术和金相显微组织分析技术，对首钢研制开发的X80热轧板卷在不同焊接热循环下的组织和力学性能变化规律进行了深入分析。结果表明，粗晶热影响区是X80管线钢焊接热影响区中冲击韧性较差的区域，脆化严重。粗晶热影响区脆化是由晶粒的粗化以及粒状贝氏体、上贝氏体和M—A组元等非平衡中温和低温转变产物增多所致，且其冲击韧性随着f8/5的增加而降低。细晶热影响区是X80管线钢焊接热影响区的软化区域，软化程度随着焊接热输入的增加而提高。
The thermal simulation and microstructure analysis technology are used to investigate the variation of the microstructure and mechanical properties of the heat affected zone （HAZ） of X80 hot rolled strip under the situations of different welding heat cycles. The results indicate that the coarsegrain zone existed in HAZ has weaker toughness and serious brittleness. The brittleness of coarsezone ascribes to coarse grain size, the increasing quantity of granular bainite and upper bainite as well as other unbalance low and middle temperature transformation microstructures. The impact toughness softening of coarse-grain zone decreases with the increment of t8/5. Refined-grain zone is the zone in HAZ, and the softening content increases with the increment of heat input.
出处
《首钢科技》
2010年第2期18-22,共5页
Shougang Science and Technology
