D2 steel is austenitizing at 1040 ° C, holding time are 10 minutes, 20 minutes and 30 minutes, and then the oil quenching, and cryogenic treatment.
After testing can find the following points:
Around cryogenic treatment hardness changes is not obvious, indicating that mould steel AISI D2 steel retained austenite is very little at 1040 ° C quenching.
When cryogenic treatment time is 4 hours and 8 hours the hardness of the samples increase the amount is larger, showed that cryogenic treatment time is too short, the transformation of residual austenite is not completely. The processing time in 4~8 hours, transformation basically completed.
After 2 hours of tempering at 500 °C, D2 steel hardness decreased obviously. Compared with the hardness after cryogenic treatment, the difference between the maximum amount can reach 6.8HRC. This is because quenching martensite transformation into tempered martensite in the process of tempering, matrix hardness reducing lead to material hardness decreased. May also be because the tempering temperature is too high, the transformation of martensite is too big, and the presence of grain growth by caused.
The above article from Songshunsteel official website (http://www.songshunsteel.com/)
The original address: http://www.songshunsteel.com/news_show_27_15_81.html, reproduced please specify. songblog1506
After testing can find the following points:
Around cryogenic treatment hardness changes is not obvious, indicating that mould steel AISI D2 steel retained austenite is very little at 1040 ° C quenching.
When cryogenic treatment time is 4 hours and 8 hours the hardness of the samples increase the amount is larger, showed that cryogenic treatment time is too short, the transformation of residual austenite is not completely. The processing time in 4~8 hours, transformation basically completed.
After 2 hours of tempering at 500 °C, D2 steel hardness decreased obviously. Compared with the hardness after cryogenic treatment, the difference between the maximum amount can reach 6.8HRC. This is because quenching martensite transformation into tempered martensite in the process of tempering, matrix hardness reducing lead to material hardness decreased. May also be because the tempering temperature is too high, the transformation of martensite is too big, and the presence of grain growth by caused.
The above article from Songshunsteel official website (http://www.songshunsteel.com/)
The original address: http://www.songshunsteel.com/news_show_27_15_81.html, reproduced please specify. songblog1506
