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爆炸复合法制备的奥氏体不锈钢因在制备过程中易产生加工硬化,复合后必须进行消应力热处理。而奥氏体钢在消应力热处理时易出现腐蚀倾向,因此本文以奥氏体不锈钢复合板为研究对象,对比分析6种热处理工艺条件下材料的晶间腐蚀性能变化,从而制定合理的热处理工艺。研究结果表明:在((540~680)±10)℃/4 h温度范围内,如果采用炉冷的方式冷却,奥氏体钢均出现晶间腐蚀倾向;而当热处理工艺为(540±10)℃/4 h,空冷时,不足以改善材料的加工硬化现象;当热处理温度升高,工艺为(680±10)℃/4 h空冷时,不锈钢仍出现晶间腐蚀倾向;只有当温度定位(620±10)℃/4 h空冷时,奥氏体钢恢复了良好的塑形,并表现出优良的耐蚀性,且金相检验结果表明,弯曲试样表面仅存在大量的塑形变形,而无裂纹。因此爆炸复合后,不锈钢复合板的最佳热处理制度为:(620±10)℃/4 h空冷。
Austenitic stainless steel prepared by explosion compound method is easy to produce work-hardening in the preparation process, and must be subjected to stress relief heat treatment after compounding. However, austenitic steels tended to corrode easily during stress relief heat treatment. Therefore, in this paper, the austenite stainless steel clad plate was taken as the research object. The changes of the intergranular corrosion resistance of the materials under the six heat treatment conditions were analyzed and compared to make a reasonable heat treatment process . The results show that the austenitic steels tend to intergranular corrosion in the range of (540 ~ 680) ± 10 ℃ / 4 h when cooled by furnace cooling. When the heat treatment process is (540 ± 10) ) ℃ / 4 h, air-cooling is not enough to improve the work hardening of the material. When the heat treatment temperature is (680 ± 10) ℃ / 4 h air cooling, the intergranular corrosion tendency of stainless steel still appears. (620 ± 10) ℃ / 4 h air cooling austenitic steel restored good shape and showed excellent corrosion resistance, and the metallographic examination results show that there is only a large number of bending deformation of the sample surface deformation Without cracking. Therefore, after explosion compound, the optimal heat treatment system of stainless steel clad plate is: (620 ± 10) ℃ / 4 h air cooling.