淬火冷却速率对海洋平台用Ni-Cr-Mo-B钢性能的影响

张守清, 胡小锋, 杜瑜宾, 姜海昌, 庞辉勇, 戎利建

Effect of Quenching Cooling Rate on Mechanical Properties of a Ni-Cr-Mo-B Steel for Offshore Platform

ZHANG Shouqing, HU Xiaofeng, DU Yubin, JIANG Haichang, PANG Huiyong, RONG Lijian

图4 回火处理后不同冷却方式实验钢的SEM照片

Fig.4 SEM images of tempered experimental steels after cooling by water (a, b), oil (c, d), air (e~g) and furnace (h~j), respectively. Fig.4b is the magnified image of the zone ‘A’ in Fig.4a. Fig.4d is the magnified image of the zone ‘B’ in Fig.4c. Figs.4f and 4g are magnified images of the zones ‘C’ and ‘D’ in Fig.4e, respectively. Figs.4i and 4j are magnified images of the zones ‘E’ and ‘F’ in Fig.4h (LMT-tempered lath martensite; LBT-tempered lath bainite; GBT-tempered granular bainite; F-ferrite)