CAJ | 학술논문

为研究低温和预应变对奥氏体不锈钢强度的影响规律，以奥氏体不锈钢S30408为例，对母材和9％预应变材料进行了液氮温度下恒定速率的拉伸试验。研究表明：材料屈服强度和抗拉强度规律均符合正态分布；在95％可靠度和90％置信度的条件下，母材和9％预应变材料屈服强度的标准值分别为383 MPa和449 MPa，抗拉强度的标准值分别为1521 MPa和1535 MPa；低温能够显著提高材料的屈服强度和抗拉强度，而预应变能够有效提高材料的屈服强度，但对于抗拉强度基本没有影响；低温会降低材料屈强比，而预应变则会提高屈强比。
위연구저온화예응변대오씨체불수강강도적영향규률，이오씨체불수강S30408위례，대모재화9％예응변재료진행료액담온도하항정속솔적랍신시험。연구표명：재료굴복강도화항랍강도규률균부합정태분포；재95％가고도화90％치신도적조건하，모재화9％예응변재료굴복강도적표준치분별위383 MPa화449 MPa，항랍강도적표준치분별위1521 MPa화1535 MPa；저온능구현저제고재료적굴복강도화항랍강도，이예응변능구유효제고재료적굴복강도，단대우항랍강도기본몰유영향；저온회강저재료굴강비，이예응변칙회제고굴강비。
To investigate the influence of low temperature and cold stretching on strength of austenitic stainless steel,the tensile tests were conducted under the liquid -nitrogen temperature with the parent metal and 9%-prestrained material of S30408.Results show that the distribution of yield strength and tensile strength can be described as normal distribution;Under the condition of 95%reliability and 90%confidence,the parent metal and 9%-prestrained metal′s standard values of yield strength are 383 MPa and 449 MPa respectively,and the standard values of ultimate tensile strength are 1521 MPa and 1535 MPa respectively;low temperature will increase yield strength and ultimate tensile strength dramatically, while the prestrain can only increase the yield strength;low temperature could decrease the yield ratio,yet cold stretching could increase it.