Hot dip galvanized steel sheet and method for producing same

A hot dip galvanized steel sheet comprising a base steel sheet and a hot dip galvanized layer on at least one surface of the base steel sheet, wherein the base steel sheet has a chemical composition comprising, by mass %,

• C:
• 0.050% to 0.350%,
• Si:
• 0.10% to 2.50%,
• Mn:
• 1.00% to 3.50%,
• P:
• 0.050% or less,
• S:
• 0.0100% or less,
• Al:
• 0.001% to 1.500%,
• N:
• 0.0100% or less,
• O:
• 0.0100% or less,
• Ti:
• 0% to 0.200%,
• B:
• 0% to 0.0100%,
• V:
• 0% to 1.00%,
• Nb:
• 0% to 0.100%,
• Cr:
• 0% to 2.00%,
• Ni:
• 0% to 1.00%,
• Cu:
• 0% to 1.00%,
• Co:
• 0% to 1.00%,
• Mo:
• 0% to 1.00%,
• W:
• 0% to 1.00%,
• Sn:
• 0% to 1.00%,
• Sb:
• 0% to 1.00%,
• Ca:
• 0% to 0.0100%,
• Mg:
• 0% to 0.0100%,
• Ce:
• 0% to 0.0100%,
• Zr:
• 0% to 0.0100%,
• La:
• 0% to 0.0100%,
• Hf:
• 0% to 0.0100%,
• Bi:
• 0% to 0.0100%,
• REM other than Ce and La:
• 0% to 0.0100% and
• a balance of Fe and impurities,
• a steel microstructure at a range of ⅛ thickness to ⅜ thickness centered about a position of ¼ thickness from a surface of the base steel sheet contains, by volume fraction,
• ferrite:
• 0% to 50%,
• retained austenite:
• 0% to 30%,
• tempered martensite:
• 5% or more,
• fresh martensite:
• 0% to 10%, and
• pearlite and cementite in total:
• 0% to 5%,
• when there are remaining structures, the remaining structures consist of bainite, and
• a number ratio of tempered martensite with a Mn concentration profile satisfying the following formulas (1) and (2) is 0.2 or more with respect to the total number of the tempered martensite:
• [Mn]b/[Mn]a>1.2 (1)
• [Mn]a/[Mn]<2.0 (2)
• where [Mn] is the Mn content in mass % in the base steel sheet, [Mn]a is the average Mn concentration in mass % in the tempered martensite, and [Mn]b is the Mn concentration in mass % at the interfaces of different phases of the tempered martensite and at least one of the ferrite phase and the bainite phase.