CAJ | 학술논문

为研究9Ni钢在热处理过程中的尺寸变化机理,在同一位置对热处理前后的9Ni钢板尺寸进行了测量。结果显示,钢板在一次和二次淬火前后其宽度和长度尺寸均发生增加,并且其膨胀率相近。分析认为,9Ni钢板尺寸发生变化的原因是淬火过程中钢板相变层的膨胀量超过未相变层的屈服应变,导致未相变层奥氏体发生塑性延伸。
위연구9Ni강재열처리과정중적척촌변화궤리,재동일위치대열처리전후적9Ni강판척촌진행료측량。결과현시,강판재일차화이차쉬화전후기관도화장도척촌균발생증가,병차기팽창솔상근。분석인위,9Ni강판척촌발생변화적원인시쉬화과정중강판상변층적팽창량초과미상변층적굴복응변,도치미상변층오씨체발생소성연신。
In order to study the mechanism of the dimensional change of 9Ni steel in heat treatment process,the length and width in the same place of the 9Ni steel sample were measured before and after heat treatment. The results show that the dimension of steel plate in length and width direction all increase after first and second quenching,and the expansion rate in length direction is the same as it in width direction approximately. It is considered that the reason of the dimensional change of 9Ni steel is due to the expansion of phase transformation layer exceed the yield strain of untransformed layer,which lead to plastic elongation of the untransformed austenite layer.