淬火冷卻速度對L80-13Cr厚壁鋼管組織性能的影響

Effect by Quench Cooling Speed on Microstructure and Properties of L80-13Cr Heavy-wall Steel Tube

摘要: 對厚壁L80-13Cr鋼管進行調質處理，研究不同淬火冷卻速度對其金相組織、硬度、強度和韌性的影響。試驗結果表明：與空氣中風冷相比，用水作為L80-13Cr厚壁鋼管的淬火介質，鋼管的淬透性較好，不存在游離的鐵素體，組織均勻，強度較高；在相同回火工藝處理后，水冷淬火試樣的0℃橫向沖擊功平均值為47 J，較空氣中風冷試樣的0℃橫向沖擊功平均值26 J高出80%。

Abstract: The L80-13Cr heavy-wall steel tube is quenched and tempered in order to study the effect by different quench cooling speeds on the metallographic structure, hardness, strength and toughness thereof.The test results show that compared with the air-cooling process, cooling with water as the medium gets the steel tube have better hardenability, and homogeneous microstructure, and no free ferrite, and higher strength.And after subjected to treatment with the same tempering process, the average lateral impact energy at 0 ℃ of the water-quenched specimen is 47 J, and is 80%higher than that of the air-cooled specimen which is 26 J.