论文部分内容阅读
利用Ｇｌｅｅｂｌｅ－１５００焊接热模拟试验机，在固定的加热速度（１５０℃／ｓ），峰值温度（１０５０℃）及峰值温度保持时间（７ｓ）条件下，研究了８００～５００℃冷却时间（ｔ８／５）对奥氏体－贝氏体球墨铸铁焊接热影响区的组织及力学性能的影响。研究结果表明，当ｔ８／５＝９～１５ｓ时，高碳马氏体占基体组织的９５％以上，σｂ与αＫ值显著下降，当ｔ８／５＝２０～３０ｓ时，马氏体与屈氏体共存，随屈氏体量的增加，σｂ及αＫ值上升；当ｔ８／５＝４０ｓ时，马氏体消除，屈氏体占基体组织的９７％，其σｂ＝６２９ＭＰａ；δ＝４．５％；αＫ＝２８．５Ｊ／ｃｍ２，进一步提高ｔ８／５到１００～２００ｓ，出现一些索氏体及铁素体，σｂ及αＫ稍有下降。
The cooling time of 800 ~ 500 ℃ (t8 / min) was studied under the condition of fixed heating rate (150 ℃ / s), peak temperature (1050 ℃) and peak temperature holding time (7s) by using Gleeble- 5) Effect on the microstructure and mechanical properties of HAZ of austenitic-bainitic ductile iron. The results show that when t8 / 5 = 9 ~ 15s, the high carbon martensite accounts for more than 95% of the matrix and the σb and αK values decrease significantly. When t8 / 5 = 20 ~ , The values of σb and αK increased with the increase of the volume of the tuff. When t8 / 5 = 40s, the martensite was eliminated and the troostite accounted for 97% of the matrix, σb = 629MPa; δ = 4.5 %; ΑK = 28.5J / cm2, further increase t8 / 5 to 100 ~ 200s, some sorbite and ferrite appear, σb and αK decrease slightly.