摘要:

AbstractUltimate tensile strength, 0·2% proof strength, elongation, and impact energy measurements are reported for an alloyed ductile iron of composition (wt-%) Fe–3·49C–2·33Si–0·42Mn–0·25Cu–0·23Mo–0·035Mg for austempering temperatures of 400, 375, and 350°C and a range of austempering times after austenitising at 920°C for 120 min. The ADI ASTM A897M:1990 standard is satisfied for an austempering temperature of 350°C but not at 375 or 400°C. This behaviour is discussed in terms of the influence of the unreacted austenite volume from the stage I austenitising reaction and the carbide product of the stage II austenitising reaction on the ductility. The present findings are predicted by the processing windows determined from the austempering kinetics.MST/3393

ISSN:0267-0836    

DOI:10.1179/mst.1996.12.9.780

出版商:Taylor&Francis    

年代:1996

数据来源: Taylor

摘要:

AbstractA method has been developed to determine the time to 50% static recrystallisation as a function of process variables using a minimum number of tests. The method utilises current knowledge of the rate of post-dynamic recrystallisation (also termed metadynamic recrystallisation) to provide a starting point for testing. The significance of this is that the rate of post-dynamic static recrystallisation varies only slightly with strain, temperature, grain size, and composition. An example is given where the effect of strain and temperature on the recrystallisation of a large grained C–Mn steel was determined from only 12 tests. The results provided considerable detail related to the change from conventional static to post-dynamic static recrystallisation, and the strain and temperature sensitivity of the conventional static recrystallisation reaction.MST/3422

ISSN:0267-0836    

DOI:10.1179/mst.1996.12.9.788

出版商:Taylor&Francis    

年代:1996

数据来源: Taylor