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首页> 美国卫生研究院文献>Materials >Effect of Rolling Temperature on Microstructure Evolution and Mechanical Properties of AISI316LN Austenitic Stainless Steel
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Effect of Rolling Temperature on Microstructure Evolution and Mechanical Properties of AISI316LN Austenitic Stainless Steel

机译：轧制温度对AISI316LN奥氏体不锈钢组织演变和力学性能的影响

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摘要

The impacts of rolling temperature on phase transformations and mechanical properties were investigated for AISI 316LN austenitic stainless steel subjected to rolling at cryogenic and room temperatures. The microstructure evolution and the mechanical properties were investigated by means of optical, scanning, and transmission electron microscopy, an X-ray diffractometer, microhardness tester, and tensile testing system. Results showed that strain-induced martensitic transformation occurred at both deformation temperatures, and the martensite volume fraction increased with the deformation. Compared with room temperature rolling, cryorolling substantially enhanced the martensite transformation rate. At 50% deformation, it yielded the same fraction as the room temperature counterpart at 90% strain, while at 70%, it totally transformed the austenite to martensite. The strength and hardness of the stainless steel increased remarkably with the deformation, but the corresponding elongation decreased dramatically. Meanwhile, the tensile fracture morphology changed from a typical ductile rupture to a mixture of ductile and quasi-cleavage fracture. The phase transformation and deformation mechanisms differed at two temperatures, with the martensite deformation contributing to the former, and austenite deformation to the latter. Orientations between the transformed martensite and its parent phase followed the K–S (Kurdjumov–Sachs) relationship.
机译：研究了在低温和室温下轧制的AISI 316LN奥氏体不锈钢的轧制温度对相变和力学性能的影响。通过光学，扫描和透射电子显微镜，X射线衍射仪，显微硬度测试仪和拉伸测试系统研究了显微组织的演变和力学性能。结果表明，在两个变形温度下都发生了应变诱发的马氏体相变，并且马氏体体积分数随变形而增加。与室温轧制相比，低温轧制大大提高了马氏体的转化率。在变形为50％时，应变为90％时，产生的分数与室温相当，而在变形为70％时，奥氏体完全转变成马氏体。随着变形，不锈钢的强度和硬度显着提高，但相应的伸长率却急剧下降。同时，拉伸断裂的形态从典型的韧性断裂变为韧性断裂和准断裂的混合体。在两个温度下，相变和变形机制不同，其中马氏体变形促成前者，奥氏体变形促成后者。转变后的马氏体与其母相之间的取向遵循KS（Kurdjumov-Sachs）关系。

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