Effect of partial heat treatment on the mechanical properties of high carbon tool steel used in manufacturing active parts in cold work tool steel dies

الونداوي, نيفين جمال

doi:10.30684/etj.27.5.18

	Effect of partial heat treatment on the mechanical properties of high carbon tool steel used in manufacturing active parts in cold work tool steel dies
Engineering and Technology Journal
Article 1, Volume 27, Issue 5, 2009, Pages 181-189 PDF (277.51 K)
DOI: 10.30684/etj.27.5.18
Author
نيفين جمال الونداوي
Abstract
Effect of partial heat treatment on the mechanical properties of high carbon tool steel used in manufacturing active parts in cold work tool steel dies was investigated in this work. High carbon alloy steel (X210Cr12) classified as (QN1.2080) according to (DIN) was used for machining specimens with dimensions (5×44×20mm). (18) specimens were insulated from the middle to the end by graphite with (5mm) thickness and (18) specimens were insulated by ceramic (Al2O3 + Kaolin) with (5mm) thickness. The distance between the middle to the sharp edge was not insulated. All these specimen were subjected to heat treatment, They show that can obtain hardness (65HRC) for the sharp edge at (980oC) after the specimens were quenched in oil. Stress relive was subjected to all specimens , it has been shown during heating between (100-200oC) There is no big effect on the hardness and the strength was increased, also when heating temperature increase up to (600 C ) the hardness decrease at (30 HRC) . Rockwell hardness test was employed to all specimens, at four locations for each specimen. The first location is at distance (10mm) from the sharp edge and the second at (20mm) from the sharp edge within un insulated part. The third location is at (30mm) and the forth at (40mm) from the sharp edge within insulated part. The best values of hardness for the insulated specimen with graphite are (65,64HRC) within the un insulated part and (47,48 HRC) within the insulated part. For the specimen with ceramic insulation the hardness values are (65,64 HRC) within the un insulated part and (51,52 HRC) within the insulated part. The results of this work was applied on the active parts of some press working sheet metal dies, produced in central tool room plant/Nasser state company, it has been shown that the life and fracture strength of these parts (punch, die and stripper) were increased and improved.

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