本文研究了15Mn,15MnVB及20MnVB三种钢在0.1NHCI水溶液中氢致断裂.三种钢、热处理后获得贝氏体、回火马氏体及F/M双相组织。用延迟断裂及断裂力学实验方法测定出σn—t_f及dα/dt-K曲线,结果表明:等温贝氏体抗氢脆敏感性最好,回火马氏体最差,F/M双相组织显著降低了氢致断裂倾向。
The behaviour of hydrogen induced cracking of three low carbon alloysteels, 15Mn, 15MnVB and 20MnVB, has been studied in the aqueous solution of 0.1N HCl. Three different structures ,of them: bainite, tempered martensite and F/M dual-phase revealed after heat treatment. Using the data of the delayed failure and fracture mechanics tests, the σ_n/σ_(bn) vs t_f and da/dt vs K were plotted. The experimental results showed that the best susceptibility to hydrogen embrittlement resistance is the structure of isothermal bainite, the worst one is of tempered martensite and F/M duai-phase structure is obviously reduced the hydrogen induced cracking tendency.
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