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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Post-Weld Heat Treatment on Microstructure and Mechanical Properties of X52 Linepipe HFIW Joints
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Effect of Post-Weld Heat Treatment on Microstructure and Mechanical Properties of X52 Linepipe HFIW Joints

机译：焊后热处理对X52管线管HFIW接头组织和力学性能的影响

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摘要

In the present paper, influences of normalization heat treatment on microstructural and mechanical properties of high-frequency induction welded (HFIW) joints of X52 steel have been investigated. HFIW joints were post-weld heat treated at different times and temperatures. The microstructure and mechanical properties of the heat treated joints were then comprehensively investigated. Based on the results, a proper normalization of the primary fine grain steel caused the grain size to increase; but because of converting brittle microstructure into ductile microstructure, it caused the toughness to increase also. In addition, the ductility of the joints was enhanced. Nevertheless, tensile strength, yield strength, and hardness were reduced. The results showed that 950 A degrees C was the optimum normalization temperature from the standpoint of fracture toughness for the X52 steel joints. At 1050 A degrees C, the carbides and/or nitrides in the steel dissolved, and excessive grain growth occurred. Hence, the maximum allowable temperature for normalization was found to be 1000 A degrees C.
机译：本文研究了正火热处理对X52钢高频感应焊接（HFIW）接头的组织和力学性能的影响。 HFIW接头在不同的时间和温度下进行了焊后热处理。然后全面研究了热处理接头的组织和力学性能。根据该结果，一次细晶粒钢的适当正火会导致晶粒尺寸增加。但是由于将脆性组织转变为韧性组织，因此韧性也增加了。另外，提高了关节的延展性。然而，抗张强度，屈服强度和硬度降低了。结果表明，从断裂韧性的角度出发，X52钢接头的最佳归一化温度为950A。在1050 A的温度下，钢中的碳化物和/或氮化物溶解，并且发生了过度的晶粒长大。因此，发现归一化的最高允许温度为1000 A摄氏度。

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