| 摘要 |
A method of heat treatment of a wearable working tool (20, 36), particularly a plough share (20), having a leading edge region (22) which is subject to wear during ploughing, and a mounting region (23) having spaced mounting holes (24) by which the share can be mounted on a saddle, in which the treatment comprises the steps of: heating the entire body of the share to a sufficient extent, followed by rapid cooling, so as to harden the share and to provide a required level of wear resistance to the leading edge region (22); and subsequently carrying out localised tempering of at least the areas surrounding the mounting holes (24) in the mounting region (23), on each side of the share, in order to remove at least some of any embrittlement of such areas caused by the initial wear-resistant hardening step, and thereby to improve the resistance of such areas to possible stress fracturing under load.
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