The Effect of PWHT on Softening under Creep in Low Alloy Steels.
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概要
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Softening and microstructural evolution of low alloy steels during aging under stress were investigated using creep ruptured specimens.Screw portion of the specimens was assumed to be subjected to no stress.Regression equations for the softening curves in screw portion were estimated with hyperbolic one.ΔG, that is, difference in logarithm of Lanson Miller parameter for screw portion and that for parallel portion at a given hardness level was plotted against applied stress.Relationship between them was linear.Critical stresses which had no influence on softening behavior were about 98 and 49MPa for Cr-Mo steels and Mn-Ni-Mo steel respectively.The critical stress decreased with increasing temper parameter of PWHT (post weld heat treatment) and also corresponded approximately to creep rupture stress at 20×103 of Larson Miller parameter in creep rupture master curve.It was found that microstructural evolution and coarsening of carbides during aging were accelerated with stress.
- 一般社団法人 日本高圧力技術協会の論文