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

作　　者：李光[1] 徐学利[1] 张骁勇[1] 王洪铎[1] LI Guang;XU Xueli;ZHANG Xiaoyong;WANG Hongduo(Xi'an Key Laboratory of High Performance Oil and Gas Field Materials,School of Materials Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China)

机构地区：[1]西安石油大学材料科学与工程学院,西安市高性能油气田材料重点实验室,西安710065

出　　处：《机械工程材料》2023年第9期41-45,56,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51174165)。

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。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.

关 键 词：X100管线钢 热影响区 冲击韧性 显微组织 热模拟 

分 类 号：TG142.1[一般工业技术—材料科学与工程]