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?? ??????? ??? ????? ????????? ??? ?????? ??????? ?????? ????? ????? ?????? ???? ??????? ?????? ????? ????? ?? ???? ????? ?????? ?????? ??? 50 ?100 ?/? ???? ???? ≥70MPa? ????? ??? ????? 0.01 ~ 0.2 ????? ???? ???? ?????? ??? ??????? ????? ??????? ???? ????? ?? CT4 ~ 6 ??? ??????? ??? ???? ????? ?????? ????? ????? ?????? ?? ???????? ???? ???? ???? ?????? ?? ????? ????? ?? ???? ?? ???? ???????? ???????? ???????? ????? ????????? δm_FF1C?5%.

???? ?????? ??????????? ?????? ??????? ????? (0.02 ~ 0.08 ???? ??????) ??? ????? ?????? ??????? ????????? ??? ???? ?????? ??????? ???? ?????? ?? ?????? ??? ?????? ??? ??? ???? ???? ?? ???? ????? ?????? ??????? ????? ?????? ?? ???? ????? ??? 0.05 ~ 0.5 ?/?? ????? ????? ??????? ??? ??? ????? (0.1 ~ 0.3 ???? ??????) ???? ????????? ??????? ??? ?? ??????? ?????? ????? ?????? ?? ??????? ????? ???? ???????? ???????? ??? T6? ???? ???? ≥300MPa? ?????????? δ ??? 7% ~ 12%. ??? ???? ≥300MPa? ?????????? δ ??? 7% ~ 12%.

?? ????????????? ?????? ??????? ??? ??? ???? ???????? ??????? ??????? ?? ????? ???? ???? ?????? ??????? ?? ???? ????? ????????? ???? ????? ??? ?????? ?? ???? ???????? ???????? ????? ????? ?? ???? ????? ???????? ?????? ?????? ????????? ????????? ???? ??? ?????? ??????? ????? ??????? ???????? ????? ?? ??? ????? ???? ??? ???? Ⅰ (?? ???? ???? ?? 30 ????? ?? ??? ???? ?????? 0.02 ???? ??????)? ???? ????? ?? ???? ????????? ?? ??????? ?? CT7 ~ 10 ???? ????? ????? ??????? ????? ?????.