标准名称：	机床零件热处理技术条件 第5部分：渗氮、氮碳共渗
英文名称：	Technical requirement heat treatment for machine tool parts—part 5:Nitriding and nitrocarburzong
中标分类：	机械 >> 加工工艺 >> 热处理
ICS分类：	机械制造 >> 热处理
替代情况：	替代JB/T 8491.5-1996
发布部门：	中华人民共和国国家发展和改革委员会
发布日期：	2008-06-04
实施日期：	2008-11-01
首发日期：
作废日期：
提出单位：	中国机械工业联合会
归口单位：	全国热处理标委会
起草单位：	北京机床研究所;北京莫泊特热处理技术有限公司
起草人：	高仰之、姜椿年、李志敏
出版社：	机械工业出版社
出版日期：	2008-11-01
页数：	6页
批文号：	24496-2008

本部分规定了金属切削机床零件的渗氮、氮碳共渗的的技术要求、检验方法与验收规则。
本部分适用于经气体渗氮、离子渗氮和氮碳共渗处理的钢、铁零件。

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Product Code:SAE AIR1168/11
Title:Spacecraft Boost and Entry Heat Transfer (STABILIZED Jul 2011)
Issuing Committee:Ac-9 Aircraft Environmental Systems Committee
Scope:The prediction of vehicle temperatures during ascent through the earth?s atmosphere requires an accurate knowledge of the aerodynamic heating rates occurring at the vehicle surface. Flight parameters required in heating calculations include the local airstream velocity, pressure, and temperature at the boundary layer edge for the vehicle location in question. In addition, thermodynamic and transport air properties are required at these conditions.Both laminar and turbulent boundary layers occur during the boost trajectory. Experience has shown that laminar and turbulent heating are of equivalent importance. Laminar heating predominates in importance in the stagnation areas, but the large afterbody surfaces are most strongly affected by turbulent heating. Once the local flow conditions and corresponding air properties have been obtained, the convective heating rate may be calculated for a particular wall temperature. This assumes that the boundary layer flow regime (that is, turbulent, laminar, or transitory) has also been established, so that a heating theory corresponding to the particular flow conditions may be selected.This section presents theoretical methods for computing boost vehicle surface aerodynamic heating rates. First, procedures are given for computing the local flow distributions around the vehicle. Second, methods are given for computing the convective heating rates, using the flow parameters found previously.