回火和沖擊試驗溫度對套管鉆井鋼沖擊韌性及斷裂機理的影響
Effect of Tempering and Impact Test Temperature on Impact Toughness andFracture Mechanism of Casing Drilling Steel
摘 要
對以鐵素體+珠光體組織為主的鋼材進行910 ℃淬火+不同溫度回火(500,550,600 ℃)熱處理,獲得超高強度級套管鉆井鋼,并在不同溫度(-60~20 ℃)下進行沖擊試驗,研究了回火和沖擊試驗溫度對套管鉆井鋼沖擊韌性和斷裂機理的影響。結果表明:隨著回火溫度的升高,套管鉆井鋼的馬氏體逐漸消失,形成回火索氏體組織,室溫沖擊時消耗的沖擊能增大,最大沖擊載荷減小;不同溫度回火鋼的沖擊斷口宏觀形貌均為纖維區和剪切唇,斷裂機理均為韌性斷裂;550 ℃回火套管鉆井鋼的韌脆轉變溫度為-33.64 ℃,隨著沖擊試驗溫度的降低,其沖擊能逐漸減小,宏觀斷口形貌由完全纖維區轉變為近完全放射區,微觀斷口形貌由完全韌窩形貌轉變為包含局部韌窩結構的準解理結構。
回火
試驗溫度
沖擊韌性
斷裂機理
casing drilling steel
tempering
test temperature
impact toughness
fracture mechanism
Abstract
The steel with a ferrite + pearlite microstructure was quenched at 910 ℃+tempered at different temperatures (500, 550, 600 ℃) to obtain the ultra-high strength grade casing drilling steel. The obtainal casing drilling steel was subjected to impact tests at different temperatures (-60-20 ℃). The effects of tempering and impact test temperatures on the impact toughness and fracture mechanism of the casing drilling steel were studied. The results show that as the tempering temperature increased, and the martensite in the casing drilling steel gradually disappeared, and the tempered sorbite structure was formed. Meanwhile, the impact energy consumed in room temperature impact increased, and the maximum impact load decreased. The impact fracture macromorphology of the steel tempered at different temperatures was both fiber zone and shear lip, and the fracture mechanism was ductile fracture. The ductile-brittle transition temperature of the casing drilling steel tempered at 550 ℃ was -33.64 ℃. As the impact test temperature decreased, the impact energy gradually decreased, the fracture macromorphology changed from a complete fiber region to a nearly complete radiation region, and the fracture micromorphology changed from complete dimple to a quasi-cleavage structure containing local dimple structures.
中圖分類號 TG142.1+2 DOI 10.11973/jxgccl202304008
所屬欄目 材料性能及應用
基金項目 石油管材國家重點實驗室資助項目(223117007);中國石油天然氣集團公司科學研究與技術開發項目(2016-A3905);西安石油大學材料科學與工程學院省級優勢學科項目(YS32030203);研究生創新與實踐能力培養項目(YCS21121022)
收稿日期 2022/3/29
修改稿日期 2023/3/2
網絡出版日期
作者單位點擊查看
備注許天旱(1971-),男,陜西禮泉人,教授,博士
引用該論文: XU Tianhan,ZHANG Yi,BI Liuhan. Effect of Tempering and Impact Test Temperature on Impact Toughness andFracture Mechanism of Casing Drilling Steel[J]. Materials for mechancial engineering, 2023, 47(4): 40～44
許天旱,張燚,畢柳涵. 回火和沖擊試驗溫度對套管鉆井鋼沖擊韌性及斷裂機理的影響[J]. 機械工程材料, 2023, 47(4): 40～44
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【6】ZHANG X N,QU Y D,LI R D.Low temperature impact toughness and fracture analysis of EN-GJS-400-18-LT ductile iron under instrumented impact load[J].Journal of Iron and Steel Research International,2015,22(9):864-869.
【7】王烽,廉曉潔.沖擊韌脆轉變曲線數學模型的選擇[J].理化檢驗(物理分冊),2009,45(10):617-620. WANG F,LIAN X J.Selection of the mathematical model on ductile-brittle transition temperature curve of impact test[J].Physical Testing and Chemical Analysis (Part A (Physical Testing)),2009,45(10):617-620.
【8】趙建平,張秀敏,沈士明.材料韌脆轉變溫度數據處理方法探討[J].石油化工設備,2004,33(4):29-32. ZHAO J P,ZHANG X M,SHEN S M.On the method of data processing for ductile-brittle transition temperature[J].Petro-Chemical Equipment,2004,33(4):29-32.
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【11】唐平英.Ti-A1合金和Mg-Zn-Y合金中典型長周期相的力學性能研究[D].南寧:廣西大學,2012. TANG P Y.Study on mechanical properties of typical long-period phases in Ti-A1 alloy and Mg-Zn-Y alloy[D].Nanning:Guangxi University,2012.
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