Ijiri Masataka, Okada Norihiro, Kanetou Syouta, Yamamoto Masato, Nakagawa Daisuke, Tanaka Kumiko, Yoshimura Toshihiko
Sanyo-Onoda City University, 1-1-1 Daigaku-Dori, Sanyo-Onoda, Yamaguchi 756-0884, Japan.
Materials (Basel). 2018 Nov 15;11(11):2291. doi: 10.3390/ma11112291.
This research investigated high-temperature corrosion (500 °C) of Cr-Mo steel processed using water jet peening or multifunction cavitation (MFC), and the suitability of such steel for high-temperature boilers and reaction vessels. High-temperature corrosion was induced using an embedment test and a coating test using sulfide-type K₂SO₄-Na₂SO₄ powder. To measure the relaxation of the residual stress due to the decrease in work hardening caused by an increase in specimen temperature and the difference in thermal shrinkage between the surface and interior of the specimen, a thermal cycling test was conducted. For the MFC-processed specimen, the oxide film that formed on the surface suppressed mass loss, prevented crack formation, and reduced the compressive residual stress caused by high-temperature corrosion. MFC-processed Cr-Mo steel is thus suitable for a high-temperature corrosion environment.
本研究调查了采用水射流喷丸或多功能空化（MFC）处理的Cr-Mo钢在500℃下的高温腐蚀情况，以及这种钢对高温锅炉和反应容器的适用性。使用硫化物型K₂SO₄-Na₂SO₄粉末通过埋入试验和涂层试验来诱发高温腐蚀。为了测量由于试样温度升高导致加工硬化降低以及试样表面和内部热收缩差异而产生的残余应力松弛，进行了热循环试验。对于MFC处理的试样，表面形成的氧化膜抑制了质量损失，防止了裂纹形成，并降低了高温腐蚀引起的压缩残余应力。因此，MFC处理的Cr-Mo钢适用于高温腐蚀环境。
