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| Ti—V—Nb微合金管线钢水下焊接粗晶区的韧性与沉淀物行为 | |
| 引用本文： | 石永华 王国荣. Ti—V—Nb微合金管线钢水下焊接粗晶区的韧性与沉淀物行为[J]. 钢铁钒钛, 1999, 20(4): 1-6 |
| 作者姓名： | 石永华 王国荣 |
| 作者单位： | 华南理工大学 |
| 基金项目： | 广东省自然科学基金!资助项目 (项目号 970 5 4 7) |
| 摘 要： | 对Ｘ６０，Ｘ６５和Ｘ７０三种微合金管线钢水下焊接及空气中焊接热影响粗晶区（ＣＧＨＡＺ）的显微组织，冲击韧性以及Ｔｉ－Ｖ－Ｎｂ沉淀物的尺寸分布和溶解行为进行了考察并用Ｘ射线能谱仪测定了沉淀物的成分。 |
| 关 键 词： | 沉淀物 微合金化 粗晶区 韧性 管线钢 焊接 |
BEHAVIOR OF CGHAZ TOUGHNESS AND PRECIPITATES OF UNDERWATER WELDED Ti-V-Nb MICROALLOYED PIPELINE STEELS |
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| Shi Yonghua Wang Guorong. BEHAVIOR OF CGHAZ TOUGHNESS AND PRECIPITATES OF UNDERWATER WELDED Ti-V-Nb MICROALLOYED PIPELINE STEELS[J]. Iron Steel Vanadium Titanium, 1999, 20(4): 1-6 | |
| Authors: | Shi Yonghua Wang Guorong |
| Affiliation: | South China University of Technology |
| Abstract: | Microstructure,impact toughness and precipitation behaviors of Ti-V-Nb particles in both the underwater and in-air welded coarse-grained heat-affected zone(CGHAZ) of X60,X65 and X70 microalloyed pipeline steels were investigated.The precipitate composition was also examined with Energy Disparsive X-ray(EDX) unit.The results showed that grain size of high-Ti steels (X60 and X70) CGHAZ zone was smaller than that of low Ti steels(X65) and impact toughness higher than that of it.It is related to the stability of different microalloying precipitates(Ti-rich and V-rich) in the thermal weld cycles and their different size distributions in parent materials.Higher cooling speed of underwater wet welding resulted in the presence of greater quantity martensite in the CGHAZ so that their impact toughness was lower than that of in-air welding. |
| Keywords: | precipitate microalloying underwater welding coarse-grained heat-affected zone (CGHAZ) toughness |
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