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?金屬高温拉伸试验方法标准即将升级GB228

作者：來源：发布日期： 2020.10.21

信息摘要：

?金屬高温拉伸试验方法标准即将升级GB228

不久前，由钢研总院负责修订的《金屬材料拉伸试验第2部分：高温试验方法》标准进入修订环节，作为试验机金屬材料试验的常用标准，该标准的修订实施，将对试验机产品产生直接影响。

GB/T 228《金屬材料拉伸试验》分为以下四个部分：1、室温试验方法；2、高温试验方法；3、低温试验方法；4、液氦试验方法。

本次升级的将是GB/T 228的第2部分。本部分代替GB/T 4338-2006《金屬材料高温拉伸试验方法》，与GB/T 4338-2006相比主要技术内容变化如下：

― 修改了标准名称；

― 修改和增加了部分术语和符号，如指示温度符号由“θ”更改为“T”，规定温度符号由“θi”更改为“Ti”，增加了术语“保温时间ts”，“规定非比例延伸强度Rp”改为“规定塑性延伸强度Rp”；

― 增加了试验速率的控制方法A应变速率控制方法；

― 第9章表2温度的允许偏差及温度梯度表中增加了“1000℃＜T≤1100℃”温度允许偏差及温度梯度；

― 在第10章增加了引伸计的装卡方法；

― 修改了试验结果数值的修约；

標准提供了兩種試驗速率的控制方法。方法A爲應變速率（包括橫梁位移速率），相對誤差±20%。方法B傳統的應變速率範圍。方法A旨在減小測定應變速率敏感參數時試驗速率的變化和減小試驗結果的測量不確定度。本部分將來擬推薦使用應變速率控制模式進行拉伸試驗。

通常，高溫拉伸試驗下試驗速率對力學性能的影響比室溫下影響更大。

傳統上，高溫拉伸試驗的力學性能測試采用比室溫拉伸試驗低的應變或應力速率。本部分除了推薦采用較低的應變速率，還允許在特定情況下采用較高的應變速率，如與測試室溫性能相同的應變速率。

目前該標准正在審定中，將于不久後推出，屆時，作是試驗機常用標准的重要一部分。

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The Curate, of course, had heard nothing about the Clockwork man's other performances; he had scarcely heeded the hints thrown out about the possibility of movement in other dimensions. It seemed to him, in the uncertain light of their surroundings, that the Clockwork man's right arm gradually disappeared into space. There was no arm there at all. Afterwards, he remembered a brief moment when the arm had begun to grow vague and transparent; it was moving very rapidly, in some direction, neither up nor down, nor this way or that, but along some shadowy plane. Then it went into nothing, evaporated from view. And just as suddenly, it swung back into the plane of the curate's vision, and the hand at the end of it grasped a silk hat. Good fitting is often not so much a question of skill as of the standard which a workman has fixed in his mind, and to which all that he does will more or less conform. 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