查看更多>>摘要：As reported in our previous issue, Aston University is closing Wolfson Heat Treatment Centre at the end of the year and this is our final edition of the journal. Editor since the start, Alan J Hick indulges in a proud look back at some of the highlights from HEAT TREATMENT OF METALS 1974.1-2004.4, including major milestones for the Centre. "A short newsletter to keep our members informed would be a good idea". This suggestion, mooted at an early Wolfson Heat Treatment Centre planning meeting, was taken on board and expanded upon by a young Alan J Hick, ever enthusiastic to disseminate helpful information about our vital technology. Consequently, within twelve months of the Centre's establishment, a full-blown technical journal, HEAT TREATMENT OF METALS, to be an important and highly-fulfilling part of my life over the subsequent 31 years, was born.
查看更多>>摘要：In gas carburising, where direct quenching is now common practice, control of surface carbon content in treated components is critical. Normal gas carburising control is based on the equilibrium relationship between carbon potential and atmosphere parameter such as dew point, carbon-dioxide content or oxygen potential. Recognising the non-equilibrium conditions which exist in practice, the authors present comprehensive data to illustrate the principles involved in optimising processing conditions in terms of time, temperature and atmosphere control. It is shown that the "boost/diffuse" technique offers substantial savings in overall cycle time for case depths in excess of 0-5 mm, the optimum ratio of boost to diffuse time being dependent upon the alloy content of the steel.
NSTL