<正> 我们适应工程上的需要,研究了1Cr18Ni9Ti奥氏体不锈钢在沸腾的高浓度MgCr_2水溶液中的腐蚀疲劳行为。 试样从热轧棒材上切取,经1100℃,10min,W.Q.后加工而成,标距部分为直径3长15mm,表面光洁度▽8。又从管材上切取15×3×1.5mm的片状试样,表面光洁度▽6。试验用钢的化学成分(wt-％)为;C 0.05,Mn 1.84,Si 0.53,S 0.021,P 0.026,Cr 18.40,Ni 10.30,Ti 0.45,Fe余量。 试验在专用的蠕变-疲劳试验机上进行,交
The stainless steel 1Cr18Ni9Ti corrodes severely in the boiling 45% MgCl_2 solution. But an improvement on strength and prolongation of rupture time under stress corrosion are obviously shown if it undergoes an application of alternating stress, saying, 20 to 39 MPa, superposing to the static stress. The smaller the static stress, the more obvious the effect is. Even the alternating stress increases up to 68 MPa, it does not shorten any more rupture time. Since the machine parts are quite difficult to operate under no mechanical vibration, it seems to be available for elongating the rupture life of which the machinery runs under corrosive medium with an additional alternating stress controlled within a narrow limit.
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| [4] | Nabm, H. |
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