Effect of Preheating Temperature on Critical Fracture Stress of Welded Joints of X100 Pipeline Steel
摘 要
选用E9010-G焊条,采用手工电弧焊在不同预热温度(80,120,160℃)下对X100管线钢进行了焊接,研究了接头热影响区(HAZ)显微组织和硬度,通过插销试验测试了其临界断裂应力,分析了接头冷裂敏感性。结果表明:焊接接头HAZ组织主要为板条状贝氏体-铁素体(BF),随着预热温度的升高,热影响区组织细化,脆性相M-A组元数量减少,BF板条束逐渐变窄且分布变紧密;焊接接头的临界断裂应力随预热温度升高而增大,HAZ硬度降低;在3种预热温度下,接头的临界断裂应力均大于0.75σs(σs为母材屈服强度),HAZ硬度均小于冷裂纹产生的临界硬度,接头的抗冷裂性能较好。
Abstract
X100 pipeline steels were welded by manual arc welding using E9010-G cellulose electrode at different preheating temperatures (80, 120, 160℃). The microstructure and hardness of heat affected zone (HAZ) of the joint were studied and the critical fracture stresses were measured by implant test. The cold cracking sensitivity of the joint was analyzed. The results show that the microstructure of HAZ of the welded joint mainly consisted of lath-like bainite-ferrite (BF). With the increase of preheating temperature, the HAZ microstructure was refined, the amount of brittle M-A constituent decreased and the BF lath became narrow and distributed tightly. The critical fracture stresses of welded joints increased with the rise of preheating temperature while the hardness of HAZ decreased. At the three preheating temperatures, the critical fracture stress of the welded joint was higher than 0.75σs (where σs was yield strength of base material) and the HAZ hardness was lower than the critical hardness of cold cracks, indicating a relatively high resistance to cold cracking of the welded joint.
中图分类号 TG407 DOI 10.11973/jxgccl201710005
所属栏目 试验研究
基金项目 陕西省重点学科专项资金资助项目(ys37020203)
收稿日期 2016/12/2
修改稿日期 2017/8/24
网络出版日期
作者单位点击查看
备注郑梗梗(1991-),男,陕西咸阳人,硕士研究生
引用该论文: ZHENG Genggeng,ZHANG Guangli,WANG Hongduo,HUANG Jingpeng. Effect of Preheating Temperature on Critical Fracture Stress of Welded Joints of X100 Pipeline Steel[J]. Materials for mechancial engineering, 2017, 41(10): 20~23
郑梗梗,张广利,王洪铎,黄景鹏. 预热温度对X100管线钢焊接接头临界断裂应力的影响[J]. 机械工程材料, 2017, 41(10): 20~23
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