X100管线钢焊接热影响区不同区域的显微组织与冲击韧性
Microstructure and Impact Toughness of Different Regions of Welding Heat-Affected Zone of X100 Pipeline Steel
摘 要
采用Gleeble-3500型热模拟试验机在不同峰值温度下对X100管线钢进行单道焊热模拟试验，研究了X100管线钢热影响区粗晶区（峰值温度1 300℃）、细晶区（峰值温度950℃）、临界区（峰值温度850℃）和亚临界区（峰值温度650℃）的组织和冲击韧性。结果表明：粗晶区的奥氏体晶粒严重长大，晶界处存在块状马氏体-奥氏体（M-A）组元，与母材相比，其冲击吸收功下降了42.6%；细晶区的晶粒发生完全再结晶，晶粒尺寸均匀，晶粒中弥散分布着点状M-A组元，冲击吸收功损失不大；临界区的晶粒发生部分再结晶，晶粒大小不一，冲击吸收功下降了16.4%；亚临界区经历了一次短时高温回火，冲击韧性与母材相比变化不大。
热影响区
冲击韧性
显微组织
热模拟
X100 pipeline steel
heat-affected zone
impact toughness
microstructure
thermal simulation
Abstract
The single pass welding of X100 pipeline steel was simulated by Gleeble-3500 thermal simulator at different peak temperatures, and the microstructures and impact toughness of coarse-grained heat-affected zone (peak temperature of 1 300℃), fine-grained zone (peak temperature of 950℃), critical zone (peak temperature of 850℃) and subcritical zone (peak temperature of 650℃) of X100 pipeline steel were studied. The results show that the austenite grains in the coarse-grained zone grew up seriously, and there were massive martensite-austenite (M-A) components at grain boundaries; the impact absorption energy decreased by 42.6% compared with that of the base metal.The grains in the fine-grained zone were completely recrystallized with uniform grain size, and the point M-A components were dispersed in the grain; the impact absorption energy had little loss. The grains in the critical zone were partially recrystallized with different grain size, and the impact absorption energy decreased by 16.4%. The subcritical zone underwent a short time high temperature tempering, and the impact toughness changed little comparing with that of the base metal.
中图分类号 TG142.1 DOI 10.11973/jxgccl202309007
所属栏目 试验研究
基金项目 国家自然科学基金资助项目（51174165）
收稿日期 2022/5/31
修改稿日期 2023/6/19
网络出版日期
作者单位点击查看
备注李光(1988-),男,陕西西安人,工程师,硕士
引用该论文: LI Guang,XU Xueli,ZHANG Xiaoyong,WANG Hongduo. Microstructure and Impact Toughness of Different Regions of Welding Heat-Affected Zone of X100 Pipeline Steel[J]. Materials for mechancial engineering, 2023, 47(9): 41～45
李光,徐学利,张骁勇,王洪铎. X100管线钢焊接热影响区不同区域的显微组织与冲击韧性[J]. 机械工程材料, 2023, 47(9): 41～45
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