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在三种不同环境中研究了AISI304钢在平面应变条件下的SCC临界应力及SCC应力判据。实验结果概述如下:(1)固溶态的304钢在沸腾的42wt%MgCl_2溶液中的SCC临界应力经测定为13.8kgf/mm~2,与根据总应变能理论所估算的值相等,此值与微观滑移线发达的基体金属的屈服应力十分相近。试样的破断形态依载荷而变。在σ_2/σ_1~≤-3.5的应力状态下,微裂纹停止扩展。(2)敏化的304钢在沸腾的22wt%NaCl溶液中的SCC临界应力测得为21.3kgf/mm~2,即等
The SCC critical stress and SCC stress criterion of AISI 304 steel under plane strain condition are studied in three different environments. The experimental results are summarized as follows: (1) The critical SCC stress of 304C steels in boiling 42wt% MgCl2 solution was determined to be 13.8kgf / mm2, which is equivalent to the value estimated from the theory of total strain energy The yield stress of the base metal with microscopic slip line is very similar. The broken shape of the specimen changes according to the load. In the stress state of σ_2 / σ_1 ~ ≤-3.5, the microcracks stop expanding. (2) The critical SCC stress of sensitized 304 steel in a boiling 22 wt% NaCl solution was 21.3 kgf / mm ~ 2, ie